Topper third brake light Wire

[Dennis Gulau]

I have a 2018 2500 4x4.

I have a topper to put on and want to wire in the third brake light.
I've read that there is supposed to be a wire stubbed out of the factory harness that is for the third brake light in a topper but can't for the life of me find it.

Any tips on finding this mystery wire?
Or perhaps a different way to wire in a third brake light?

 

[crash68]

I believe is a Wht/Purple wire located about where the receiver mounts to the frame on the driver's side. That where I found mine(it a 1500 though), your should be in the similar area.
Depending on the topper, my Leer actually has a module that you wire the Left and Right trailer lights to and that turns the Third brake light on. The topper also has lights and power lock(that wired to the tailgate lock).

 

[Dennis Gulau]

I believe is a Wht/Purple wire located about where the receiver mounts to the frame on the driver's side. That where I found mine(it a 1500 though), your should be in the similar area.
Depending on the topper, my Leer actually has a module that you wire the Left and Right trailer lights to and that turns the Third brake light on. The topper also has lights and power lock(that wired to the tailgate lock).

Thanks, that is where I've been looking. If it is there, It must be hidden well.

 

[crash68]

Thanks, that is where I've been looking. If it is there, It must be hidden well.

Tried my Google-Foo and came up with a video, it's of a '15 2500 though

In a description on another forum someone noted the wire was under the spare tire.

 

[Gregdad]

It’s up on drivers side. This was my ‘15 and it’s the same on my ‘19.

 

[Dennis Gulau]

Found it. Right rear area, second cross member from the rear. There were three total wired stubbed off. One is for the third brake light.

 

[62Blazer]

Glad you found it. I was getting ready to reply that it was on the passenger side on my '16 2500 and to look there, but you beat me to it. There was only one wire on mine for the brake light so not sure what the others are for on the '18? For the interior lights in the topper I ran a hot wire all the way from the fuse box under the hood back to it.

 

[Dennis Gulau]

Glad you found it. I was getting ready to reply that it was on the passenger side on my '16 2500 and to look there, but you beat me to it. There was only one wire on mine for the brake light so not sure what the others are for on the '18? For the interior lights in the topper I ran a hot wire all the way from the fuse box under the hood back to it.

I have the auxiliary switch option. The two extra wires are for battery power and ignition power through the aux switches if I want it.

 

[62Blazer]

I have the auxiliary switch option. The two extra wires are for battery power and ignition power through the aux switches if I want it.

Makes sense. Wish mine had those!

 

[WY-Dave]

I have the auxiliary switch option. The two extra wires are for battery power and ignition power through the aux switches if I want it.

Ancient thread, but this is where I got my info to search for it. I extended the wires on the topper harness and ran them and strapped the extended harness. I was looking for the fulltime power for the topper dome light and bupkiss. Neither had power no matter of off/acc/on. Incase we overnight somewhere in the bed, won't have to have the key in. Unstrapped everything and tapped off the 7way trailer hitch full time power in the bed.

 

[GTyankee]

Ram 2500 3rd brake light for Leer Topper

How to Wire Led 3rd Brake Light Leer Topper Dodge Ram 2500

How to Correctly Wire Led 3rd Brake Light Leer Topper Dodge Ram 2500. Using the factory wire harness, located to the left of the spare tire. White wire with ...

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