OMG I hate to have to ask this

[68C15]

I normally pride myself on being an electrical guru but recent unfortunate events has led me to asking for help. on my '68 GMC 1/2 ton long wide where does the "radio" terminal of the fuse box get its supply from? I blindly attached a wire to it for feeding my electric choke & after installing a choke stat that isnt defective it up & gave out on me last night. I looked in my factory service manual at the wiring diagram & it doesnt give much details on the power supply distribution.
help please
Todd

[71meangreenc10]

Todd,
Your in luck, I have the complete harness out of my 71, The radio post beside the tsc fuse (trans controlled spark) probably not used, is fused blocked (or shunted) on the back into the following fuses, ac, heater, b/u lamps, wipers, and flasher beside those fuses. They receive there feed from the brown&brown/white wire wire off the ignition switch acc terminal. Hope that helps......

Smitty