Easy, switched, 12V Power and Ground!

avusblue said:

I cannot take credit for this, I found it on another forum oriented towards the GM pickup trucks. But here is an easy way to add accessory power that comes on and off with your ignition key. The terminals are hidden behind a cover in our drivers side footwell. This is retained accessory power -- "RAP" -- it comes on when you power up the vehicle, and stays on until you open the door, just like the radio.

Here's the thread I found it in:

If you look under the driver's side dash between the brake pedal and parking brake, you'll see the fuse/relay box (it's about 6" x 10" and has a smooth black plastic cover, just like on the GMT-900's). Pry the clasps on each side to remove. On my SLT there are three main banks, left to right, with the first being unoccupied (see attached pic). The slots within first bank are labeled 1-20, though only 11 actually have male connectors. I used my tester to determine the following: #'s 7 & 17 are constant 12v power [always on], #'s 10 & 11 are grounds, and #8 is the RAP [retained accessory power] ignition signal wire (again, see attached pic)

For newbies, RAP powers on with the key rotated to the first position and remains on until the ignition is turned completely off AND the driver's door is opened, just like the factory radio.

Enjoy!​

Here's a pic. On my 2015 Tahoe LT, it looks and works exactly as stated. Your mileage may vary!



Cheers, and good luck,

Dave.

Click to expand...

avusblue said:

I cannot take credit for this, I found it on another forum oriented towards the GM pickup trucks. But here is an easy way to add accessory power that comes on and off with your ignition key. The terminals are hidden behind a cover in our drivers side footwell. This is retained accessory power -- "RAP" -- it comes on when you power up the vehicle, and stays on until you open the door, just like the radio.

Here's the thread I found it in:

If you look under the driver's side dash between the brake pedal and parking brake, you'll see the fuse/relay box (it's about 6" x 10" and has a smooth black plastic cover, just like on the GMT-900's). Pry the clasps on each side to remove. On my SLT there are three main banks, left to right, with the first being unoccupied (see attached pic). The slots within first bank are labeled 1-20, though only 11 actually have male connectors. I used my tester to determine the following: #'s 7 & 17 are constant 12v power [always on], #'s 10 & 11 are grounds, and #8 is the RAP [retained accessory power] ignition signal wire (again, see attached pic)​

​

For newbies, RAP powers on with the key rotated to the first position and remains on until the ignition is turned completely off AND the driver's door is opened, just like the factory radio.​

​

Enjoy!​

Here's a pic. On my 2015 Tahoe LT, it looks and works exactly as stated. Your mileage may vary!

View attachment 158441

Cheers, and good luck,

Dave.

Click to expand...

greenhornet said:

I checked out my 2015 Tahoe LS and the terminals you have shown do not have any power.I found power + and - on terminals 10 and 11 that are live when key is on and that is with the switched relay under the left dash fuse panel to activate constant power with key off. This a great place for power you have found and not having to use the under hood fuse box.Thanks for the tip.

Click to expand...