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All connections inside the IPM are made by printed circuit board, no wiring is used. All connection between the front control module, the fuses and relays, and the connectors underneath is all done through circuit board. What happens is moisture coming through a vent hole in the bottom will cause corrosion on the circuit board which can cause circuits to open up. The most common circuit to have this problem is the park lamp driver circuit. The FCM turns on the park lamp relay by grounding a circuit through the circuit board.
The normal repair done on these is to replace the IPM, but as you've found it's quite expensive. What I've been doing for a few years now is opening them up, finding and repairing the bad spot on the circuit board with solder. Since it can be hard to explain I've made a short video showing my process, which you can view HERE.-->
DR IPM repair
https://www.youtube.com/watch?v=Puho2026BFs
SOURCE: dodge ram 1500 the radio and dash lights are not working
did u look at the fuses under the hood there might be one there other than that sounds like you wiring went bad or the part of your switch is bad replace the switch
SOURCE: 2006 Dodge Ram 2500 diesel truck----need inside fuse box diagram
If you are looking for the fuse box diagrams or any other diagrams for your Ram, check promanuals.net for a factory service manual for around 20 bucks or so. It's an invaluable tool for my Ram 2500.
SOURCE: dodge 2500 ram diesel no tail lights and my abs
replaced the IPM (the fuse box) it was shorted
SOURCE: Dodge Ram 1500. I have no tail lights, license
have you had your problem corrected. I just experienced the same problem. I keep finding info on changing the fuse box in order to fix the problem.
SOURCE: 2006 Chevrolet Silverado 2500HD tail lights stopped working
I am having the same problem on an 04 2500hd there isa 15 amp stop light fuse inside the cab on the side of the instrument panel and a 25 amp stop light fuse under hood. you could also have a break switch issue the switch is located up on the break pedal linkage you should have power on the white wire when you push the pedal in (check with a test light) in my case I have a broken wire along the frame rail in the harness it is a light blue wire,
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