Where Can I Tap Into Rap?

[rogerrabbit]

Howdy,

I have a 2007 Sierra Classic SCSB into which I have installed a custom center console with my two-way radios in it. The radios are on their own relay and the positive and negative come straight from the battery through the firewall to the console to the relay. (Yes, it is fused on both ends!)

 

The relay trips and the radios come on when I turn the ket to the accessory position, however, I would like to tap the "Retained Accessory Power" or RAP, so that my radios will stay on after I shut the truck until I open the door.

 

Can anyone suggest where to get a good RAP feed?

Thanks.

RR