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Old 11-05-2017, 03:56 AM   #1
Bus Nut
Join Date: Jul 2016
Location: Prince George, BC, Canada
Posts: 544
Preheater circuit

Freightliner with Cummins. Fs65 2003.
Need help trouble shooting preheater problem.
The preheater Gets too warm when i shut the bus off.
Too hot like wants to explode and Melt the wires.

Ive been solving the prob by unplug the solenoid linked to IT so i was sre the problem was there. Just replaced the solenoid with new one and the problem came back. Ive tested the electricity and i got Power in the solenoid that i just replace when the Truck is turned off (should not).

In my understanding i surely have an Electric problem but im an honnestly lost and need help about what to Do to diagnostic whats wrong exactly.

Does anyone have a circuit diagram of the preheater?

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