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Old 11-05-2017, 03:56 AM   #1
Bus Nut
Join Date: Jul 2016
Posts: 543
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?

Sent from my SM-G530W using Tapatalk

Tootalltechie is offline   Reply With Quote
Old 10-02-2023, 03:27 AM   #2
New Member
Join Date: Oct 2023
Posts: 5
Hi, I know this is weird but is there any way you have a picture of the Fuse labels in the panel that's beside the driver's chair? I really need some pics of the fuses' labels there and the ones behind the floor heater next to the door.
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