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So where are you on the wiring cleanup? Ready for the next to-do list?

The GP Controller uses the tempature sensor on the driver side rear head. TM 9-2320-289-20p, Figure 19 -------------------------------------------------------------- The Hot Idiot Light used the switch on the driverside front head The Cold Advance switch is on the passenger rear head...

The two small terminals should have continuity between them. This is what energizes the relay inside the unit. Power on one terminal, ground on the other. Some relays use the mount as the ground. If you install one of these the GPs will be energized all thee time, as the hot wire is hot all...

Thanks DH. I took that for granted. The relay looks like it does have the isolation rubber feet.

You can install a new feed wire for the GP and run it directly from the front battery. There are many people here that have used the 12v Terminal Block without any problem. The way I decribe the setup is not my idea. Just restating what has already been discussed many times. With clean...

This weekends assignment: Disconnect both batteries - negative terminals Spend some time reading the first few pages of the Troubleshooting section of the TM 9-2320-289-20. It will tell you how to read the wiring diagrams and what the symbles mean, wire sizes, etc. 1. Remove Reistor pack...

Here is a picture of a stock M1009. This is what we are trying to get back to.

Okay, we will need some pictures of the fusebox. Also pull the manual GP switch out and take a picture of it. The RED wire that is cut is the 24v feed wire to the bottom fuse. It appears that the PO had an issue with the firewall plug and just bypassed the problem. I see that you are...

People always want to change thier trucks to 12v or get rid of the stupid GM wiring. With a stock system, I can sit across the country and look at a picture or description of a wire and help diagnose a problem. When a truck has a hack wiring job, your guess is a good as mine. Sorry for the...

More questions: When I am asking about the firewall block. There are three groups of terminals. Each group serves certain things on the truck. I need to now whick terminal the wire comes out of so I can tell which circuit it is. 6 - In the first picture there are two red wires coming from...

Questions: 1 - Has the truck been converted to 12v? 2 - How are the batteries hooked up? 3 - Has the starter relay under the dash been renoved? 4 - The cut wire, What part (terminal) of the firewall block is the wire coming out of? Count the colums and rows. Use the example picture as a guide...

I may take awhile but we should be able to get Humpty Dumpty back together. Where are the red wires going to when the pass thru the firewall? I will post some wiring diagrams in the morning. The TM diagrams have some errors in the GP wiring.