| Wiring Vacuum Pump [message #108201] |
Sat, 11 December 2010 12:40  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma:
|
Senior Member |
|
|
I have my JC4 pump installed on one of JimK's mounting brackets and am pleased as can be with the exception that it did not work.
I studied the wiring explanation on Gene's site and hooked the ACC wire into the yellow wire that goes to the heater fan as per instructions.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=4675&cat=3471
No luck. When I tested the yellow wire, I could only get 0.2 volts, which was not enough to trigger the pump relay. I have a '74 coach if that matters. If I hook the Acc wire to 12 volts, the pump runs. (quiet little thing... love it.)
I was wondering of one of the smart guys knows of another handy ACC wire under the "hoods", or do I get to pull the lower dash skirt for the 12,000th time and fish for an ignition controlled wire? I love standing on my head trying to get my varilux lenses to focus on something... anything. It is these moments we GMC fellows live for.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
