Wiring diagram

[fastback86]

I'm trying to find a switched power source inside (on with key in run position) the cab to hook something up. Does anyone have a wiring diagram for a '98 GMC3500HD or know where a good place to tap in is? I don't need that mauch power, less than 1 amp.

 

[88gmctruck]

Take a test light to the convenience center (under the dash, left side near the parking brake). There are connections for various options in these trucks, and you'll find constant and switched power here.

 

[DieselCash]

Take a test light to the convenience center (under the dash, left side near the parking brake). There are connections for various options in these trucks, and you'll find constant and switched power here.

That is how I did my truck. Then I "T" the wire and hooked it to a relay. Did it over 3 years ago and still works great to this day.

 

[fastback86]

Thanks for the help!