How-To: GMT900 Cargo Light Mod.

biggjay96x · January 18, 2010

Thanks for the info. great job.

georgecdisc · January 18, 2010

You might want to check the add-a-circuit fuse holder on what it is rated for. I thought that most of them were rated for 10 amps TOTAL. Not sure I would feel comfortable having a maximum of 40 amps potentially running through it.

brims · January 18, 2010

Just as a preventative measure, I'd recommend at least taping up that tan/brown stripe wire, the one that goes into the junction block, you wouldn't want that to come into contact with something metal and short out.

elcompalaline · January 18, 2010

You might want to check the add-a-circuit fuse holder on what it is rated for. I thought that most of them were rated for 10 amps TOTAL. Not sure I would feel comfortable having a maximum of 40 amps potentially running through it.

It came with differently rated ones in the package, I tried it with one 20A and it did not work. Then put in a 20A in one slot and a 5A in the other slot so it would work. Well it blew the 5A when I tested it because I accidentally plugged in the wiring backwards. So after that I just put in another 20A and it was good.

What I had also thought about was that maybe one slot in the Add-a-circuit was to replace the original minifuse and the second for the new "circuit" you would be adding. Thats just what came to my mind and I could be wrong. The paper work included in the box was trashed so I can't go over it even if I wanted to.

Just as a preventative measure, I'd recommend at least taping up that tan/brown stripe wire, the one that goes into the junction block, you wouldn't want that to come into contact with something metal and short out.

Yes, the cut end of the wire was taped off properly and the new connection was taped up as well.

BloodRedSilverado · January 19, 2010

I was actually gonna try to perform this mod this weekend, but thanks for making it easier on me....

BigBlueLB756 · January 20, 2010

Does anyone know if the stock 2009 Chevy/GMC Instrument Panel Cluster Combo Switch could be added to the vacant dash space and work for this mod? How about it, parts guys?

mfennema · January 21, 2010

Does anyone know if the stock 2009 Chevy/GMC Instrument Panel Cluster Combo Switch could be added to the vacant dash space and work for this mod? How about it, parts guys?

+1

anyone?

BigBlueLB756 · January 23, 2010

Great mod! 2009 trucks use the white wire with the black stripe. Works as advertised!

brims · January 23, 2010

They changed the freaking wiring color from 07-08 to 09 models? Jesus, why call them GMT900s if your going to change half the vehicle.

elcompalaline · January 24, 2010

Great mod! 2009 trucks use the white wire with the black stripe. Works as advertised!

Really, but the wire's location is the same right?

BigBlueLB756 · January 24, 2010

Same plugs as brims shows on his included schematic diagrams (post #16 on the other thread), X6 pin2 (BCM) to X12 pin6 (junction box). White wire with black stripe was sticking out away from the bundle; I took that as a sign and cut it. Hooked it all up and it worked like a champ! I put my switch in the right side of the panel with my DIC switch. Much thanks to elcompaLalo and brims for this helpful mod!

Oh, another thing: the cover for the junction box is a real pain-in-the-*ss to get off because of the ribbed "fastener" in the center. Pull it out; there are hooks on the bottom and sides of the cover that hold it on securely and it will be easier to remove the cover the next time you need access.

nqabigt · January 24, 2010

Great mod! 2009 trucks use the white wire with the black stripe. Works as advertised!

Really, but the wire's location is the same right?

It was in the same location for mine, also white with black stripe, 08' Sierra

BigBlueLB756 · January 25, 2010

Same location you showed in the pictures, except I had that cover to deal with.

Still working today, so I guess it wasn't a dream. GOOD MOD.

elcompalaline · January 25, 2010

Thanks for the info fellas, I would like to edit my original post to inform 08+ owners the difference in the wire colors but it seems I can no longer do that. Just hope they read the whole thread before starting it.