HD90 MKIV drill wiring

[MrMajestical]

Troubleshooting a HD90 mark IV drill electrical issue. Engine will not start. The hour meter doesn't work, so that being the trigger for a relay that triggers the fuel lift relay, I am wondering if this is an issue? Also the fuel pump doesn't work, I ran a series of jumpers to supply power to the fuel pump, and a couple other things and it started. I have a wiring diagram but it doesn't show some things that are on this equipment, like a solenoid on the bottom of the injector pump, and what looks like a temp switch on the left side of the engine that is wired to this solenoid. And info on how to fix this would be appreciated.

 

[lantraxco]

Temp or oil pressure switch?

 

[MrMajestical]

Temp or oil pressure switch?

I called a dealer and a tech there did say that the temp switch would go out and it was a known issue with this machine. I have spent dozens of hours troubleshooting this thing. I guess I need to pull every electrical component and test it. Another issue is there is no horn switch, which is wired into the emergency shutoff switch, so I'm wondering if that's a problem. I think it is a combination of several things. I know it will run, but it figuring out what's wrong w/o throwing hundreds of bucks in parts on it.

 

[charleseccles7@]

Hello
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