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Roadmaster Tow Bar Wiring Kit Installation - 2014 Fiat 500L

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How to Install the Roadmaster Tow Bar Wiring Kit on a 2014 Fiat 500L


Today on our 2014 Fiat 500L, we're going to be taking a look at and installing the Road Master Universal High Power Diode Wiring Kit, part number RM-154. The first thing we're going to do is go ahead and get our 30 feet of 4-pole wire. We're going to take one end of it and cut it off. Now we're going to go ahead and stick our grabber down through there, just to grab onto this, but you can use a pair of pliers or whatever you need to that way we can pull our end out here and have our connections easily accessible for the towing vehicle or RV. Once we've pulled it through we'll be able to pull our cap through as well. The cap will just come around the outside and over the top. Next we'll go ahead and open up the hood to gain access to the engine compartment, that way we can look down and see where our wire's coming up at. Now we can see our wire directly down from here, but we might not necessarily want to come directly up.

We might try and bring it over that way we can run it to the battery side over here and make our loop. With our first pull wire pulled down, it's going to come out right here on the top. You can see it through here, right above our piece. I'll go ahead and pull it down the rest of the way using a pair of pliers or a reach tool. Now we have our fish wire pulling down and we can connect our end that we cut off of our 4-pole wire to the end of this, pulling it all the way up and into the engine compartment. I'm just going to adjust this to where it comes underneath of the headlights, it makes it a little easier to pull it out here.

Now we'll go ahead and zip tie this off on this side here that way we make sure it doesn't come back and slide back down in. It's going to secure this end for any kind of further tugging or pulling we have to do on our wires. We'll go ahead and make our 12" loop now for our auxiliary system that's going to be placed in here. Then we'll run the excess wire back down and underneath the vehicle. Go ahead and put it down, try and run it back behind the other wiring harnesses and stuff we have in the engine compartment here.

Try and get it as concealed and tucked away as possible. Now that we've got our wires pulled down out of the back of the engine compartment, we're going to run it over the top of the heat shield and try and keep it as protected as we can against any kind of heat from the exhaust. Another thing you want to watch out for is going to be any kind of pinch point, any spot where it can get frayed, and of course your moving parts underneath the vehicle. As we came down out of the back of the engine compartment we ran it over the top of these protective plates and cross-members here, over the top of the pipes and lines here, zip tying it off to make sure it doesn't fall down and get any closer to the exhaust. Running back and behind the heat shield, and then all the way underneath the heat shield plastic here to the back, right before the rear axle. Before the rear axle it's going to go up and above the fuel tank, coming out again, back here and coming straight over the top to the middle where we're going to pull it up, where you see the pull wire going into the cab here. Now we'll go ahead and open up the rear hatch and get inside to clear out these items so we can pull back the sides and make all of our wires nice and neat. Note that there are going to be some nice little easy-access compartments to these taillights, but we're not going to be using those since we want to tuck all of our wires underneath and keep it as clean as possible on the inside.

We'll go ahead and remove the threshold first. There's going to be two screws, one securing it here, and one securing it on this side by the hook and tie down. We'll go ahead and repeat that on the other side as well to pull out that foam box. Now we're going to remove the sub-woofer just to give us a little extra room as well. We have one more screw to remove it looks like down here on the bottom side to remove the threshold so we can pull back these panels. There's going to be a little torx bit screw right here in the center. With that one removed we should be able to pull this right out. Lift up and pull it back. We got two torx bit screws on either side of the back here, we'll go ahead and remove those next. These screws are going to be a T25 torx bit. Now we'll go ahead and peel back the rubber seal on this side so you can see where the fasteners are that are securing this back panel. We'll stick our trim panel tool in there just to pry it off of it right there. With these side pieces here, now that we got that back tab removed, we're going to go ahead and remove the screw that's behind this hook here. To do so, take a small, little screwdriver, you're going to stick it up underneath the bottom side, push up, and pull out. There's going to be a little tab here and you just want to depress that in so you can get access to that screw. Once you have access to it, we'll go ahead and undo that screw as well. Now we'll go ahead and pull back our panel, note that there are going to be a couple push tabs, may make it a little bit difficult to pull it out, but you just want to bring it out real easy. You can locate those tabs as you get closer to them and then just kind of pop them out. Right there should be plenty enough for us to get our wires in the back and then we'll use that little access hole here on the backside to pass through those wires. You have the cover that you can remove here for that little access hold. Underneath the vehicle we decided to go just right back from that plastic cap, that big plastic cap that was in the center and we found that nice rubber grommet here. On the other side you can see we've already stuck our pull wire into it, just so it would hold onto it and we could pull it the rest of the way through. If we have a little hiccup getting through, we're going to start pulling those wires through one-by-one just to get them up top. Once we have our wires through, nice and tight, we're going to then go ahead and peel back this electrical tape on this grommet so we can try and get wires through the grommet and tape it off that way we don't have to make any modifications to our seal at the back. Peel off that electrical tape at the end, get access to that wire loom, and the grommet. You can see that's going to be a pretty snug little fit through there so let's see if we can get it. Once we have our pull wire through we'll go ahead and feed it until we get our other end up there and hopefully it'll stretch it out a little bit, giving us a little better opportunity to get through there. We'll go ahead and press our seal back down into the back and make sure we still have a nice watertight seal here on the back of our vehicle. Let's go ahead and split our wires and trim them back as we need. Now what we're going to do . you see our yellow is going to go over to our driver side, so we'll just set that off to that side and then our brown and green are going to go over to our passenger side. For this passenger side we're going to run our wires right up and behind to where we can gain access. The first thing we're going to do before we even jump in there and try and figure out what's going on; locate the two allen bolt levers here, and we're going to go ahead and loosen it up that way we can remove the taillight so it makes it a little easier on us. Once you get it started, you should be able to just to twist it and pull off the nut. These are just big nuts, not attached to the end. Once we get this other one off we should be able to pull the taillight assembly out of the way. Go ahead and pull straight back, away from the alignment tabs, and pull the screws out of the way. This will make it easier to unplug the back and gain access to our wires. We'll go ahead and route our wires through the back, down below the threshold, and back up, making sure they steer clear of any sharp edges and so we can pull them out of the top. Go ahead and tape up our wires on the backside, you don't have to do this, it just keeps them in place and makes them look a little nicer against the back of this threshold here. Next we're going to go ahead and route that yellow wire out the same way, so let's go ahead and loosen up the driver's side taillight and we'll pull that out as well. Remember there are the alignment tabs there that everything fits in place. Don't pull out too much, because remember, you do need to disconnect that wire harness. Peel up on the tab here, and then out. Go ahead and route your yellow wire, back up and behind, once you have it, go ahead and pull it all the way through. We're going to go ahead and test out our circuit now and find out what lights are our running lights, what lights are our brake lights, and our turn signals. We'll go ahead and turn off the running lights and we'll test out the brake lights. Let off. On. Off, left turn. Our brake lights are going to be the green, let's see if we can figure out which one's this left turn signal. Our left turn signal's going to be the blue with a white stripe and then we'll go ahead and test out our running lights. We'll turn off the brake lights, we'll turn off the turn signal, and just test our running lights. Turn them off. On. Off. On. It looks like we have two wires for our running lights and those are going to be the two yellow ones here on the driver's side. With us back over here on the passenger's side, we're going to test out our wires again. Assuming that they're going to be pretty close to the same as the driver's side, we're probably looking at those wires there so we'll go ahead and test those out. We'll go ahead and test our brake lights, turn them off. On. Off. Running lights. Off, and we'll test out the other one. Off. On. The yellow ones are running lights again and that means blue's going to be the turn signal, so go ahead and try out the right turn signal. Yep. Now that we have all of our wires distinguished on what they are, we can now go ahead and peel back the loom a little bit more on the inside so we can make our connections. Now we're going to go ahead and cut back our white wire so we can put our ground right in this general location here. Go ahead and strip it back, use your included ring terminal, place it on, and we're crimp it down. Once you have that crimped down we'll go ahead and put in our self tapper, once we have it through, go ahead and back it out, place in our ring terminal, and tighten it down. Here we have our wires bundled up and ready to be put in place. We're going to go ahead and take our electrical tape off that we bundled up our wire with, and our green is going to end up being our brake light. Green to green, you'll see that this one's more green than it is yellow, got a little bit of yellow on it, but it's going to be more green. We're going to go ahead and go to the green one for the brake lights that we tested out before. We're going to cut it a little further back that way we can tuck our diodes down in the slot here. With the diodes, you're going to have two that are going to go on the passenger side. You're going to have the one with the yellow connector which is going to be for that jump wire that I was talking about before, it's going to go to the driver side. Then we're going to have the other three that are going to have just the blue connectors on them. With the spade connectors we're going to pull them off and connect them to our wires. You'll have one coming in from the motor-home, which is going to be one of these guys, and one coming in from the vehicle, and then going out to the taillight assembly. What these are going to do is it's going to help prevent any kind of back-charge into the vehicle's system so we don't blow a fuse out while we're towing our vehicle with our motor-home. We're not going to need all this extra green wire hanging out here so we're going to go ahead and cut it back here. We'll give ourselves a little bit of extra just in case and we'll go ahead and cut the brown as well since we won't need that much of that either. Now we're going to go ahead and cut that green wire and we're going to cut it back just a little bit, about right there. We'll place our spade connector on and we're going to go ahead and crimp it down. If you need to, you can come on the inside to do that or you can do it from the outside if you can tip it up enough. Now that we've got that crimped down, we'll go ahead and give it a little tug just to make sure it's good. On the other side here, we'll place our other spade connector, so we'll strip that back as well. Again, giving ourselves a little bit of extra wire there, that way can fold it over and we'll crimp it down. Now we'll go ahead and strip back that green wire that we had coming from the motor-home. Once we have that stripped back, we'll take that other blue spade connector and we'll connect it in. Now that we have those connected, we'll go ahead and place them in. The two coming from the inside are going to go on the two spades there and then coming from the factory taillight connector here is going to go into this one. Once we have those nice and secure, we'll go ahead and set that one off to the side so we can get to the next wires. The next wires, with this vehicle in particular, we're going to have to test it out. There's going to be two wires coming to our taillights, our yellow wires are going to be our running light, so we're going to need to splice into one of those to jump over to the other side. One of the circuits is going to operate the bigger outer ring and the side lamp here, the other one is going to operate this little one in the center. The outer wire is going to be the one that we want for that big outer ring, that inner wire is going to be the one that operates that little inside, inner taillight. Keep in mind that this is going to have that jump wire as well, going to the other side. Coming from the towed vehicle we're going to have the blue spade connector so we'll go ahead and hook that on there and then we'll crimp that down. Then, from our factory taillight connector here, we're going to have that green wire with the yellow, that's going to be the other blue spade connector. For this next one, it's going to be that yellow spade connector because this is going to get that brown wire coming from the motor-home and then the brown jump wire that goes over to the driver side. We'll go ahead and grab our brown wire and we're going to separate the end of that and then we're going to get our brown jump wire, or the wire that we're going to use to go over to the other side. We'll bring that back underneath through the panel, like we did the other one, and we'll bring that up in here as well. Now we'll go ahead and separate the end of that jump wire and now we can put those two together and put that yellow spade connector on the end of it and then we'll go ahead and crimp it down. Once we have that crimped down we'll be able to plug in our wires. Grab your diode, plug that yellow one into the top making sure that both of those are connected well. We'll take that yellow wire with the green, we'll connect that, make sure it's on there nice and tight, and then our signal one on the outside. Now we're going to go ahead and tape up our diodes and our connections just to make sure that everything's secure and nothing will ever come undone. Go ahead and pass it through the inside that way we can get the back of it. Now we'll go ahead and take our passenger side taillight assembly and put it back in place. Making that connection on the backside, lining up those alignment tabs on the side. Once you have it pressed in we'll then be able to put those large nuts on the back side. Go ahead and connect it to that top post located right here. We have the bottom one on already so let's go ahead and put that top one on. Once we have it threaded into place we'll go ahead and tighten it down. Just make sure they're nice and snug. Now we'll go ahead and put our cover back in place and latch it in. Go ahead and put our weather seal back in place and pop that panel back into the fastener holes. Now we'll go ahead and place our screw back in here and the one down here before we replace our sub. Now we'll go ahead and route our jumper cable that's coming off of our taillight up to the top and out the hole. Same way, back behind the plastic and out. Now we're going to go ahead and put our tread plate back in place along the back now that we've got that other brown jumper wire ran over and our yellow wire to the driver's side. We're going to have two screws that we're going to need to re-secure, then you're going to have your little tabs on here, so just make sure those tabs get put back and dropped back into the holes. You can look along the back and make sure they're all in place, make sure that you have the weather seal out of the way, and then press down. If you need to, you may need to grab the carpet and peel the carpet up since this does go underneath of it. Let's go ahead and put our weather seal back in place across the back. We'll go ahead and start our anchor down here on the bottom, then make sure it's rotated around so you'll be able to lift it up. We're going to do that next little screw that's going to go in right here and then we'll take the cap and put it over the top. We'll cut off our excess yellow wire. Now we have our yellow and our brown wire over here. Again, that brown wire's going to be the jump wire for our taillights and that yellow is going to be the brake light. We're going to have our green wire, just as we did on the other side, and our yellow wire which is going to connect to that other brown wire that we have here. That yellow wire is going to have a blue stripe on it, that's going to be the outer one just like on the other side. Outer wire, outer light. We'll go ahead and cut our green wire and we'll start with that and strip it back. We'll fold it over just as we did before to make sure that we get a nice, solid connection. We'll place our spade connector on and crimp it down. Now we'll go ahead and trim back that yellow wire since it's going to be for our brake light. Place our spade connector on and crimp it down. Take our diode, yellow in, green coming from the vehicle in, and green coming from the switch out, go ahead and cut that just as we did before. Our last and final spade connector that we're going to connect here on our brown wire. Now that we got it all crimped down, we'll place our last diode on, brown wire into the in, blue and yellow into in, and then blue and yellow out. Now that we have our diodes all taped up on our driver's side we'll go ahead and plug it back in and make our connection. Press it in, and now we'll put our nuts on the backside. With our box back in place with our air compressor and all of our spare tire tools and kit, we're going to go ahead and place in those two remaining bolts. One in the back here, the other one is going to go back over here in the corner. Once we have them started, we'll go ahead and finish tightening them down with a ratchet. We'll put our pad here back in place. Now we'll go ahead and test out our taillights, then we'll test out our brake lights. Left brake and right brake. Then our left turn signal and right turn signal. That will do it for our review and installation of the Road Master Universal High Powered Diode Wiring Kit, part number RM-154, on our 2014 Fiat 500L.


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