My OEM radio hasn't worked in years, so I finally decided to get a cheap aftermarket and install it. Wired it up and it didn't come on, checked all the wiring and everything checked out except the ACC/ignition wire is dead. Checked the fuses and all is good. The constant power wire has power and ground is good. Anyone know where the ACC power comes from or have a wiring diagram?

 

What year is your truck?

 

1984 D150 2wd, 318

 

Fuse 4 (10 amp) is main power for the radio. Is it any good?

 

Yes it has power on both sides of the fuse....is there some kind of fusible link between the fuse and the radio harness?

 

Nope. 20 gauge red wire from ignition switch. If you have power at the fuse, the switch is good, if you don't have power at the radio connector, wire is bad.

 

Does the 20ga red wire from the radio plug go directly to the ignition switch? Something I can trace it back and find the break/or issue? If I have to run a new wire any suggestion on where to tap from? Thanks for your help.

 

everything goes from the ignition switch to the fuse and then from the fuse to the radio. if you have power at the fuse then you might have a break in the wiring somewhere between the fuse and radio. if you can't find where it is broken there is a orange wire with a white stripe that has a 3 way split that you should be able to hook up to

 

I could not find any issue with the wire so I found the Orange wire under the dash that had a spot to tap into....worked great. Thanks