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Oops... '05.

Would those of you with a 5.9L look at your wire cable coming off the passenger battery to the grid heater solenoids and tell me what size the fusible link is? Is there one for each, or is there one that splits off to each solenoid? I had a battery fire and this is the only cable left to...

Not a problem; I'd like to think I've been thorough and systematic before asking for help. Even though the batteries are two years old, I've tested the batteries with a load induced, and checked voltages, voltage drops and resistances across everything. I took every cable on the battery posts...

Bob4x4, I'm an experienced commercial/industrial electrician. I've read through Mopar's service manual and schematic. While the heaters are supplied by the batteries directly, the relay coils are controlled by the ECM. The relay and heater circuits are fine. This is not my problem.

Yes, I did extensively troubleshoot, with the help of the Mopar service manual. According to the wiring diagram, the ECM supplies a separate wire to each relay coil. The other side of the relay coil is grounded. When turning the key to the on position, the ECM is sending +/-12VDC to the one...

The other morning, it was real cold, maybe 13F, and I started the truck after waiting a few seconds. Ever since, the MIL has been on. After troubleshooting the diagnostic code, P2609, that was associated with the MIL, I found no voltage from the ECM to one of the intake heater relays at the...