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Roadmaster Brake-Lite Relay Kit Installation - 2010 Honda CR-V

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How to Install the Roadmaster Brake-Lite Relay Kit on a 2010 Honda CR-V

Today on this 2010 Honda CR-V, we're going to show you a Roadmaster Brake-Lite Relay Kit for Towed Vehicles, part number RM-88400. We'll go ahead and show you what components come with this kit. First off, we've got the wire harness here, the relay, a fuse holder with the fuse already installed. This little brass piece is a fuse tap, and a terminal to slide into it, and butt connectors, a ring terminal for ground, and some zip ties. One thing we're going to add to our install today is going to be a 10 amp fuse like this. The fuses that are already in a vehicle are a flush-mount style, or mini-fuse, and so the wire tap won't work, but we can replace it with a normal fuse like this. In fact, let's go ahead and put that all together now.

It'll be easiest to show. This brass piece goes over one leg. You just work it over the top and it snaps over the plastic part of the fuse. The easiest way is to grab one end. You just work them in place.

It's a really tight fit. Just set that to the side for now. We'll go ahead and work on our wire harness here and add our butt connectors as needed. We'll work with our red wire first. We're going to add our fuse holder to this, so we're just going to cut it in half, strip the wires back. Fuse holder, just slide it onto your wire, crimp right here.

Same thing on the other side. To the end of this wire, we'll strip it off and add the little terminal. This little terminal will go onto our little fuse tap here. It may be easier to leave this on or off depending on when you actually put it in the vehicle, so I'm going to leave that off for now. Let's work with our black wire here. We're going to add the blue terminal to it and crimp it in place.

All right, we'll leave that one alone for now. Now we'll work with our green wire. Now to our green wire, we've got this little red 00:02:51 wire here. I'm going to actually add it right next to it. I'm going to twist them together. Let me cut off some excess and add the yellow butt connector. Now, this red wire is going to be used for a signal output from the brake switch when it's being depressed. This is what you need when you add a supplemental braking system to the vehicle. On this application, our blue wire's not going to be used, so we'll go ahead and take our white wire and add the ring terminal to it. Let's go ahead and take our relay, put it onto the harness, and snap it into place. We just line up the pins. Now with all these connections made, it makes a little less trouble underneath the dashboard of our vehicle. Next, we'll go underneath the dashboard, and to start off, we'll go ahead and we need to remove this panel to get access to our switch and a little extra room to get access to our fuses as well. It just pops down out of the way. This is our brake switch right here, and then we'll find the correct wire we need to cut because we want to find the wire that gets hot when we press the brake pedal. We need access to these wires right here. Just to demonstrate what we're looking for, we'll use a tester and we'll ground up some sheet metal, then I'll go ahead and check the wire. This is what we're looking for. We hit the brake pedal and we got power, so that's going to be our green with silver bands. We're going to cut that wire in half and add our wire harness. I stripped back enough wire where I can actually twist it and fold it over, so it gets more grip with the large butt connector that's provided. Now our black wire will go to the other half. For our fuse tap, we need to go to the fuse that's hot only when the key is in the on position. We're actually going to try this one right here, labeled number 22. There's no fuse in there pre-existing, so let's go ahead and try it out. There's nothing with the key off, so let's try it with the key on. Nothing on the bottom. It looks like the top side's hot. We'll double check if I turn the key off and on a couple times. Key's off. Key's on the on position, so that's what we want. We'll take our fuse and our fuse tap, and the side that's hot we want our fuse tap to go to, so let's go ahead and push it into place. Now we'll check our work. We'll test our red wire. That's going to be our output when the vehicle's in a towed position. Push down the brake pedal. It'll send a signal out to the indicator. With the key in the out or off position, we shouldn't have the brake lights come on when we hit the brake pedal. Now with the vehicle in tow mode, we still shouldn't have any brake signal. When driving the vehicle normally with the key in the on position, now we have our brake light signal driving normally. If everything's working, let's go ahead and take a moment to bundle up our wires. Also, we want to make sure we have enough wires left off for a supplemental braking system. We'll just bundle them up, and we'll just tuck them up over here. All right, we're all finished. We'll go ahead and put a little panel back up into place. Snap in from that side and then a knob back here, and we're good to go. With everything working, that'll finish it for part number RM-88400, the Roadmaster Brake-Lite Relay Kit for Towed Vehicles on this 2010 Honda CR-V.

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