Retained Accessory Power For Nnbs

[khancock]

Does anyone know where I could tap a RAP wire to trip a relay on a 08 Sierra? I've done a bunch of searching online and a bunch of probing and so far can't find anything useful.

 

I found this thread but its for NBS and after testing found the same doesn't seem to hold true for NNBS

http://www.gm-trucks.com/forums/index.php?...Accessory+Power

 

I also read the GM up fitters manual which mentioned a bunch of blunt cut wires, but I can't find those either.

 

Any help would be greatly appreciated!

[CalixEros]

That thread is for a GMT-900 (what you're referring to as NNBS). The poster does have a 2500 but that shouldn't make a difference. If yours doesn't seem to work, the best way to find out what has RAP would be to use a multimeter and see what still has power.

[khancock]

That thread is for a GMT-900 (what you're referring to as NNBS). The poster does have a 2500 but that shouldn't make a difference. If yours doesn't seem to work, the best way to find out what has RAP would be to use a multimeter and see what still has power.

 

I've been all over with a multimeter and can't find anything. I had tried following his instructions but had no luck.

[asilverblazer]

Blunt cut wires do not exist. Try teal plug behind the parking brake yellow wire. There is a thread with pictures on here somewhere.

[khancock]

Blunt cut wires do not exist. Try teal plug behind the parking brake yellow wire. There is a thread with pictures on here somewhere.

Teal plug in the BMC or somewhere else?

[asilverblazer]

There is a cover with a plastic nut holding it on, pull the cover and you will see a bunch of plugs, one is teal with a yellow wire. Look here.

[Pumper]

Here try this. It was very helpful for me.

[khancock]

There is a cover with a plastic nut holding it on, pull the cover and you will see a bunch of plugs, one is teal with a yellow wire. Look here.

Thanks, the yellow wire worked. It has about 6v on it when not in RAP for some reason? Not enough to trip my relay but I just though it was odd.

[bbnight3]

Do you know what this wire does?

 

Hello. '09 NNBS ExtendedCab Sierra, non-bose audio system. I tapped into the yellow wire on the teal connector by the brake pedal to get a RAP signal to run to my amp. Worked great. that is until I was installing a different amp which has the turn on wire terminal and the ground terminal too freaking close together and I briefly grounded the that RAP wire I tapped into. It was momentary - quick small spark - didn't seem like much. Now that wire has 12V constant on it rather than turning off when the RAP normally does. Does anyone know what that wire is or what I may have done by accidentally grounding it? Is there any known way of fixing whatever I screwed up? Everything else in the truck seems to be working normally. Thanks for the help!