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Originally Posted by GM72K10
Awesome find. I bought an 86 very similar except that the body was removed before I got it.
Wound up replacing the engine compartment harness (easiest route)
I take it you are keeping it as is and can't get it running.
Glow Plug controller was in need of replacement among other things on mine. I still can't get the horn to work either. A few bad grounds and some shorts. Had to rewire the headlight switch wiring also.
My plan of attack would to be disconnect everything and start over .
Just my two cents. I used the stock K30 K31003 diesel wiring harness diagram, it helped enough to get mine running again.
It is quite different from the cucv wiring harness I might ad.
Good Luck.Posting pictures of your engine compartment compared to mine and my truck when I got it. You have a much better truck to start with and I paid the same price!
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Thank you
Yeah, we are trying to keep it as is to remain an in service fire truck. We'd been watching it, with no plans to buy because the starting price was too high for us, but then it didn't sell and they relisted it with a lower starting price so we jumped on it.
The horn likely doesn't work on yours because the fancier sirens have a hands free mode that uses the horn button. Normally you have a switch that selects between siren and horn, so when they remove the siren and associated hardware the horn wire is left hanging loose.
The frustrating thing is that they had kept EVERYTHING working on this truck while it was in service, and the only thing that was done was the radios were removed. The siren etc are still installed. The truck sat for 2 months after it was dropped off, but we suspect there is a single wire somewhere that was cut and is causing all our issues. Thank you for the pictures, it looks like there were a lot of similarities. Do you have any tags showing who converted your truck? It very well could be the same company.