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My 1992 Cummins W250 auto trans turned out to be the Computer/ECM mounted on front fender by battery tray. Mine only acted up in cold wheather. It started out with the ASD (auto shut down relay) clicking rapidly. In addition the water in fuel, wait to start and check engine light also blinked fast. In this state, the battery would not charge.
For the brake lights check that no fuses are missing. Then check them all you should get a fuse tester. Go to the junk jard and get the cover if anything. For the headlights its common for moisture to get in the headlight bulb connector or harness and get corroded. Take the bulbs out and clean the connections with a wire brush or how ever you choose then put as much bulb grease as you want on the connection. This should take care it. Clean the inside of the harness too.
I had the same problem on a 94 dodge with the cummins. It seems the crank sensor that reads from a notch on the harmonic balancer was the problem Without this sensor reading that the engine is running the alternator wont charge. Possibly the same problem with yours
had the same problem except cruse control wouldn't work either. after checking all the relays and fuses the problem turned out to be moisture in the ECM plugs.
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