Medium and Heavy Trucks
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Hi my name is***** will be glad to help. Bare with me while I pull those specs for you.
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DDEC2 connectors and adapters
Usually there is one question per thread as the site only does one credit for us per question but if it is something not too complicated lets give it a shot.
Bonuses are always greatly appreciated as well.
Is there a manual override switch in the cab?
Click this link for a diagram
Let me pull up some further info on the fan circuit
Is this a 379?
Try swapping out the relays in the panel and cleaning and inspecting all grounds. As well
Swap with a known good one from another location for test purposes
I posted the link in the private contact window to copy and paste in your browser.
If there is no relay it will be commanded to ground through the ECM
Have you tested the high pressure switch to see if it is working with an ohm meter? Open and closed with the system cycling and verified the system has sufficient charge?
Understood. I have to head out on the road for a while but let me put my thoughts together some more on this and follow up later.