Roof Top Running Lights...

poppatello · August 31, 2013

I guess this would go in the HD Sub-Forum. I just purchase a 05 2500 HD and it doesn't have the roof top running lights and I want to install them. Just wondering if it's prewired for them and all I have to do is install?

My pop told me that Ford pre-wires their trucks so if you wanted to upgrade to options you could do so later. Is the same true for Chevy trucks???

poppatello · August 31, 2013

Damn, 77 lookers and not one response. LOL, well I've done some research on this and I've found some saying yes if you have the snow plow package which I guess I do because I have the push button for a light then you will also have the wire for the roof lights.

Then I read where it is not prewired for a roof light. This

is why I was asking. I don’t want to purchase a harness if one isn’t needed…

Grumpy Tooch · August 31, 2013

my 2500HD didn't come with the lights either. But I had the a button on the dash for the lights, and the wires already in the roof foo them. I think it comes with the plow prep package which I got. The only thing I don't like is the wires are only hot and work off the switch, which means they are only operational with the switch and don't work with the parking lights like I wanted.

MikeNH · August 31, 2013

The "roof light" wiring/ switch that is part of the plow package is not for marker lights. It's supposed to be used for a strobe/flashing safety light. Chances are if you want the roof marker lamps you're going to be running wires.

Grumpy Tooch · August 31, 2013

OH,...guess that's why its just hot lead. I actually put the marker lights on for when I plow anyways for safety reasons, but that makes sense now...

poppatello · August 31, 2013

Thanks, I wasn't sure as I have read that if you have the wires for the plow lights they also ran the wires for the roof lights. I don't want to hook the roof lights to a botton. I want them to come on and go off with the trucks running lights...

MikeNH · August 31, 2013

OH,...guess that's why its just hot lead. I actually put the marker lights on for when I plow anyways for safety reasons, but that makes sense now...

It's not a problem by any means- I think they fuse that circuit for 30A which is plenty to run those.

Makes me wonder where the harness goes for that. If the source for the lights is the upfitter connector block under the dash I'd almost be tempted to order my next truck with the plow pkg to make wiring in aux lights easier/cleaner.

Grumpy Tooch · August 31, 2013

I was very convenient, but id rather them come on with the parking lights

06_GMC · August 31, 2013

On the passenger side of the dash board on the end there is a cover. Behind that cover is a terminal block. There is two prongs in there a + & -. I'm not sure which ones they are but turn on your headlights and use a voltmeter to check which ones get power when you turn on the lights. These are meant for the cab clearance lamps. It allows you to run the wires down the A pillar and into that box. Oh and be prepared to drill some holes in the roof of your truck too. Good luck!

sonjaab · September 22, 2013

Those new LED GM roof/clearance lights SUCK!

They burn out quickly and are expensive to replace and sold in sets only IIRC.

Do a search on clearance light failures and be amazed.

The GM VYU plow prep wiring in the roof can be used for clearance light hookups.

They are on their own fuse/lug hookup in the underhood fuse center.

They have a on/off switch on the overhead light console on the gmt-900s

Roof/clearance light option from the factory uses a seperate wiring setup that

will NOT be there if not factory equipped.

They are controlled by the headlight switch and turn on when headlights are used.

NOT a seperate switch.

scooby5121 · September 23, 2013

My one on the passanger side died a week after ordering my NEW TRUCK in 08.

They cost 70 bucks but warranty covered it.

BUT....

They are a different tint of Yelllow from my Centre and Drivers side light !!!!!!

Looks like shxxxxt.

Had to live with it too. Centre light cups/warps and water came in between the light and roof and leaked all over the console and headliner and Sun shade.

Removed all lights and silicone the crap under neath and reinstallled them.

Scooby

Vortec-Z71 · September 26, 2013

Look at the attached PDF.

CabLight_Install.pdf

Grumpy Tooch · November 15, 2013

On the passenger side of the dash board on the end there is a cover. Behind that cover is a terminal block. There is two prongs in there a + & -. I'm not sure which ones they are but turn on your headlights and use a voltmeter to check which ones get power when you turn on the lights. These are meant for the cab clearance lamps. It allows you to run the wires down the A pillar and into that box. Oh and be prepared to drill some holes in the roof of your truck too. Good luck!

I could not find any non used prongs in that panel

Likarok · November 17, 2013

I have installed these lights........ all be it a few years back. At that time you just bought the lights and the wire harness. It is actually not that hard to do. Just get the location measurements of the lights from another truck at the dealership and go from there. The new ones are led so they are probably considerably different that the ones I did. Plus the ones I did had three separate lights in the middle. Now they are a single unit in the middle so you will have less drilling.

The one I did the only hard part was getting the wire down the A pillar. So I just fed the wire out the hole that the sun visor goes into when you remove it and run the wire behind the pillar cover and behind the dash. Feeding the wire between the roof sheet metal layers was easy. You start on the passenger side and work your way across with a piece of machine wire as a snake and just pull the harness along. Oh yeah.....take your headliner out and make sure you don't drill right through all the metal layers. If I remember right on the older trucks there was a plug under the dash on the drivers side that the harness plugs into.