The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Alternator-Starter-Junction Block Wiring 84 K30

Dead Parrot · 03-15-2021, 01:16 PM

Rule 1 with CUCV wiring is trust nothing until you have verified it. An example of something I found on mine: The 24V purple wire was cut on the engine side of the firewall just out of the fuse block connector. It was still hot and not taped. A 12V wire was ran off of the ignition switch and though the firewall to the other side of the purple wire. The starter was a 12v starter with 24V to the battery terminal of the solenoid and 12V for the solenoid start terminal. It was a bypass for a failed start relay under the dash. According to the paperwork I received from the last seller, this was done by an automotive repair shop while the truck was owned by a rural Fire Department.

It took a bit of puzzling things out to get it restored back to a 24V starting setup as that seemed simpler since both batteries and both alternators are still present.

03-15-2021, 01:16 PM	#5
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,660	Re: Alternator-Starter-Junction Block Wiring 84 K30 Rule 1 with CUCV wiring is trust nothing until you have verified it. An example of something I found on mine: The 24V purple wire was cut on the engine side of the firewall just out of the fuse block connector. It was still hot and not taped. A 12V wire was ran off of the ignition switch and though the firewall to the other side of the purple wire. The starter was a 12v starter with 24V to the battery terminal of the solenoid and 12V for the solenoid start terminal. It was a bypass for a failed start relay under the dash. According to the paperwork I received from the last seller, this was done by an automotive repair shop while the truck was owned by a rural Fire Department. It took a bit of puzzling things out to get it restored back to a 24V starting setup as that seemed simpler since both batteries and both alternators are still present.