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I know the blue one on that pcb is for the fan, which I have. No clue where the other 2 go. Assuming the one on the PC allows the PC to boot.
I can check my fast and furious this weekend if you want.
FWIW, the other end of that 8 or 10 pin connector that plugs into the back of your PC plugs into those two connectors on the watchdog board. That harness does a few things.
1. Provides power the the watchdog board which then goes out to pots and what not (could be why your steering is failing).
2. Send +5 standby from the PC's supply to that board. That board then turns the PC on.
Yeah you can run the computer without that board in place but if your using the factory wiring harness your not going to get +5/+12 to many of the devices in the cab that needs it.