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12 Volt Outlet Kit, 20 amps

12 Volt Outlet Kit, 20 amps

Item # RM-9332
Our Price: $40.21
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12V Power Accessories
Shipping Weight: 0.57 lbs
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RM-9332 - 1 DC Outlet Roadmaster Power Socket
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Roadmaster 12V Power Accessories - RM-9332

  • Power Socket
  • 1 DC Outlet
  • Roadmaster

Kit creates a 12 volt power outlet with 20 amps of power
  • 5' of wire included to reach battery

9332 12 Volt Outlet Kit, 20 amps

Installation Details RM-9332 Installation instructions

Video of 12 Volt Outlet Kit, 20 amps

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Roadmaster 12 Volt Outlet Kit Installation - 2021 Jeep Wrangler Unlimited

Hey, everybody. Ryan here at etrailer. Today on our 2021 Jeep Wrangler Unlimited, we're gonna be showing you how to install the Roadmaster 12 Volt Outlet Kit but before we do that, why don't we check it out and make sure that this is something you're actually gonna need. So what this 12 Volt Outlet Kit, what it's gonna do is give you a power source, that way you can plug in your braking system, your portable-type braking system. And honestly, a lot of the times we use this kit, that's exactly what it's for. A lot of portable-type braking systems have that end on it that it needs to be plugged into a cigarette-type lighter to get its power.

Not all of 'em have it, but many of 'em do. For example, the one that we have today is the Blue Ox Patriot 3. And the thing is with these Jeeps, there is an outlet in there from the factory but the issue is it's not active whenever you're flat towing. So you could plug it in there all day long and that braking system would never receive power. So this one that we're putting in will always have that power that you need to turn that braking system on.

Here's what that outlet kit is going to look like in your Jeep. And the nice thing about it, especially in our Jeep, we can mount it out of the way where it won't interfere with your driving, or it's not something you're gonna have to look at whenever you're just cruising around. But with that said, it's gonna be nice and close and easily accessible. Whenever you set your braking system in your floorboard, it's gonna be right there and really easy to get plugged in and get your braking system powered up. The 12 Volt Outlet Kit is going to be rated for 20 amps, which is more than enough for those portable-type braking systems, so you're not gonna have to worry about anything there.

And with that said, you just don't have to use this for a braking system. It's kinda just a generic 12 volt outlet so it always gives you another option. If you need to plug something else into there, you can. For example, let's say, one of those tire inflators if you need to air up something or anything like that. It's always an option.

You always have it there and you can use it for other things as well. Just to kinda give you guys an example on how this it's gonna work, I have our braking system in place, the one cord plugged in, and all we have left to do is take our power cord here. So just to show you, I'll plug into our factory outlet and we have nothing, and that's where the issue lies and that's what problem this part is going to fix. So take this and get it plugged in under the dash to our new outlet. With that plugged in, you can now hit power. You can see that the braking system turned on and is functioning like it should. Just to kinda compare this 12 volt outlet to some the other ones, honestly it's a little tricky to. This one's kinda in a league of its own, if you will. Kinda more directed towards that flat tow-type setup. Some of the other ones available are really, really basic. More or less, they're just giving you an outlet kinda. And using one of them, will it work Sure, but that could be a little more difficult to find a spot to mount up and a lot of 'em really don't come with anything other than the outlet. So you'll have to kinda put the kit together almost. With this one, it definitely gets you going in the right direction here on the Jeep. There is a few things that I had to change. I had to extend the wires a little bit, so you can expect to do that. Not by much. I might've had to use another three or four foot of wire in total just to get it to reach over to our battery. And what I did was also change out the original fuse holder. So this one has, comes with a fuse holder and absolutely nothing wrong with it, it's just the older style bus-type fuses. And I changed ours over to a more modern micro-type fuse holder. I didn't do that out of necessity, more or less out of convenience since I already had to kinda cut the wire sticks in them anyway. I figured why not put a more modern-type fuse in there, but when it comes to that, that's entirely up to you. As far as getting this installed, really straightforward. More or less you mount it up. There's a factory grommet that's easy to get to, that way you can run the wires into the engine compartment, and just by extending 'em a little bit, essentially you just hook it right up to the battery. So really shouldn't give you too many issues as long as you have that little bit of extra wire, couple butt connectors, and maybe some larger ring terminals to your a couple of 'em. You can make everything work, but having those extra small things definitely makes the process go a little bit smoother. But with that said, why don't we go ahead, pull into the garage, and put it on together now. To begin our installation, we're gonna be here inside of our Jeep on the driver's side and we're gonna be working kinda underneath the dash, over here towards the kick panel. So if you look here underneath the dash closest to the outside of our vehicle, we're gonna have a piece of metal, a piece of aluminum bracket, there from the factory and that gives us a perfect spot to mount up our outlet. And so what I've done is fed the outlet through the included bracket there, and simply used one of the provided self-tapping screws to secure the outlet bracket to that factory aluminum bracket. And that gives us a good spot out of the way to plug anything into it. Once that's done, we need to start routing our wiring, and the wiring is simply gonna go up the firewall a little bit. There's gonna be a factory grommet. If you have an automatic transmission, you can use that grommet to run our wires through. So I poked a hole in it and simply pushed our wires through it. Now underneath the hood, we can start to route our wiring towards our battery. So here's where the wiring comes out, and I simply just pushed it along our firewall here, comes out here, and it turns out that we are gonna fall a little bit short as far as the length goes to get to our battery. So I already went ahead and extended the ground side of our wiring. We still need to do the power side, so let's go ahead and run through that together now. So the way that I did the ground is I simply just stripped back our wire, used a heat shrink butt connector, and then connected on maybe a two foot piece of wire, crimped on a larger ring terminal, and now I'm gonna do something very similar with this one. I wanna mention this can be hooked up to a hot fuse. So this could be plugged in like your fuse block on a fuse that has constant power. But with that said, especially on these Jeeps in the past, we've ran into issues where they have retained power circuits and other issues like that. So the reason we're doing this, we're going right to the battery, that way we can avoid all that and have a for sure, 100% connection. So with that said, this does come with a fuse, but it is that older type bus fuse, I believe it's called. And these are kinda starting to get a little outdated. It'll work just fine but my thought is, if you end up popping it, it's probably gonna be tricky to. You're probably not gonna have one laying around or anything like that. So what I'm gonna do since we have to cut this and extend the wire anyway is cut that off and I'm going to replace it with a fuse holder like this. A little more common and chances are pretty good you'll probably have a fuse readily available that you could use in a pinch. So that said, first thing we'll do here is strip back the insulation on this wiring. Give it a good twist. I'm gonna open half to make it a little bit thicker since I'm using a little bit bigger butt connector here, but this is gonna slide right over it and then we can crimp it down. And then I'll grab my extra length of wiring here, essentially do the same thing. Strip that back, trim it up a little bit, then it's simply just gonna plug right in to the other end of that butt connector. Crimp it down. And since I'm using a heat shrink-type connector, come back with my heat gun and seal off ends. So here's how much I extended the wire, and like we talked about, I took this fuse holder and hooked it up to our extended wire the same way. I just used heat shrink butt connector on the end of the fuse holder. I used a ring terminal like this. Again, it just crimps on. And so I'm just gonna kinda tuck this around here. This is gonna go to the positive battery terminal. Make sure you don't have a fuse in it just yet. And if you peel this back, since we have some existing trailer wiring hooked up to this post, I think that's where I'm gonna hook our new wiring up. So I'm gonna take a 12 millimeter and remove that nut. Going to slide my ring terminal over the stun and simply just resecure that nut there. Get this tightened down. And from there you have our ground wire, which this one here. This of course is gonna get hooked to the negative side of our battery. So I think I'm just gonna use this stud right here. That is a 13 millimeter. I'm gonna try to get this popped off. I might need to get a little beeper socket there, might be able to make it work. You get that broke free and take our ring terminal, slide it over, and get our nut tightened back down. Now once that's snug, we'll take our fuse here. And since the original fuse was rated for 20 amps, that's the type fuse I'm using, the 20 amp fuse, we'll go ahead and get that plugged in. So now all that's left to really do is test our outlet to make sure that it's working properly. So for demonstration purposes, I just set our Patriot 3 braking system in here. I'm not gonna go through all the trouble to hook it up and everything, I just wanna make sure that we indeed get power. So I have our plug here. I'll reach back here and get it plugged on in. Plugged in, now we should be able to hit power and hopefully everything will work. So hit power, turned right on, and it's functioning so we know we do indeed now have a working power supply. Well, that'll finish up our look at and our installation of the Roadmaster 12 Volt Outlet Kit on our 2021 Jeep Wrangler Unlimited..

Customer Satisfaction Score:

Customer Reviews

12 Volt Outlet Kit, 20 amps - RM-9332

Average Customer Rating:  4.7 out of 5 stars   (202 Customer Reviews)


I spent approx. $1,400 to purchase a towed-vehicle brake system and accessories. I used your web site to make sure it fit my car. I opened it when it arrived, saw that everything was there, and didn't need it yet.

A year later I opened it to install it, to find out it doesn't fit my TOAD even though your web site said it does. I spent $1,400 for a piece of junk that I can't return a year later. I'm angry that I can't trust your web site, and that I spent $1,400 for a piece of junk that I may eventually be able to sell to someone else for pennies on the dollar. Despite what your web site said, it does not fit a 2015 Honda Fit.

That is the problem. The comment I added to my review is that you sell junk. You do.


I watched the installation video before purchasing this Outlet Kit. My installation of it was into a 2010 Subaru Forester and was no different than the video. It went without any difficulty.
The only weak point to the kit in my opinion is the brass connection piece that attaches to the fuse. It fit over the fuse connection fin without any problem.
The shortfall comes when one connects the female positive connector to the exposed part of the brass connector. The positive connector is much wider than the brass connector which goes on the fuse, making the connection loose. I crimped the positive connector in order to keep it attached to the brass connector.
I ran the outlet wire under the door sill, in the wire trough there so the outlet would be in the rear seat area. I use the outlet to power my 12VDC car refrigerator.

James L.


It performs perfectly. I am extremely satisfied with the product.


They installed a bull oz towing system and it is fantastic. It was installed in a brand new Buick and would never know they did a thing. Everything is well installed and out of sight. Would use them to install anything on my cars



Still perfect, so glad we had it installed. Get work


Didn't need it

Etrailer Expert

Katrina D.


Well then, let me get you over to customer service to see if we can get a return processed for you.


The plug works as advertised, but the mounting bracket does not hold the plug securely. I had to experiment with using electrical tape to secure the plug before mounting it to the recommended aluminum brace.


I wish that there was a way to lock the socket into the holder, I use the socket to power my auxiliary braking system so I have to place it in the footwell of the drivers side left kick panel and it keeps falling out, I will try some type of adhesive to hold it in, other than that one small issue it works well


Works as advertised.


Installed on a 2021 Jeep Wrangler Rubicon Unlimited. Fairly easy install. Works great.


Did a great job on placing my order correctly and received on the day they said it would be here - great company to order from


This 12 volt wiring kit was easy to install. I use it to provide power to my Roadmaster 9400 Even Brake supplemental braking system in a 2017 Chevrolet Equinox. It is quality product. The Video by provided a helpful addition to the instruction supplied with the kit.



Still performing great. Easy installation. I recommend this kit.


Everything worked as expected


Works great, no need to turn on power in the toad.


Exactly what we needed to finish our tow bar hook up.


Good service. Thank you.


Great for towing jeep behind the truck


Good quality. Works well.


The part worked as designed



Both the The hitch attachment for the front endf the car and the blue ox tow bars are peeling and rusting period as far as performance. They worked just as advertised. Ive had no problem functionally.


Barely long enough to go thru the firewall to connect directly to the battery instead of using the fuse.

Like a fool, I didn't look at the diagram and went off my gut, so I missed installing the mounting bracket, but I think the way I installed it will work better as I can store the outlet away until needed oh and the wire wasn't long enough to mount the bracket in a place away from your right knee and attach it directly to the battery


The gal was awesome


Great device. Gives that much needed HOT accessory socket inside the car for the braking system and when not towing, other accessories that you want to dtay connected to the battery when the ignition is switched off. (inverter for a laptop or tablet charger for instance or even a small TV.) Could be a little less expensive but it IS a higher amperage socket than you can find at the local car parts store. Quick and easy install. Recommend wire loom around the wires to protect them from wear in the engine compartment

Jim H.


Awesome. Great power source for cell phone charging or an inverter for powering a laptop


Have dealt with etrailer many times and always got professional service and quality products!


Good rugged product.


needed on toads that do not have a 12volt source when the key is "off"


Works as intended.


Don't need would like to return

Etrailer Expert

Jenny N.


Certainly, I will have our Customer Service team reach out to you.

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