Large-scale Duster electrical issue

What that can be.....

1....The dash dimmer control is a rheostat which involves a mechanical wiper controlled by the knob rubbing against and making contact with a circular wound/ coiled resistance wire. That can get dirty/ corroded or loose. First thing to try is simply vigourously working the dimmer knob left/ right many times to see if it will "scrub" the connection clean

2....The one lamp not working may be loose connection(s) at the bulb socket, which has contact fingers that make when the socket is twisted into place. These and the PC board can get corroded and dirty

3...Last other wierd cluster problems can be caused by poor grounding. Some models have a two piece PC board, but in any case, clean the ground by rotating the mounting screws from PC board to the cluster housing loose/ tighten. Clean up the board contacts area for the lamps and bend and clean the lamp socket fingers and then ADD A GROUNDING pigtail wire which you will bolt to the column support or dash frame. The original ground was the cluster mounting screws, which is poor

While you have the cluster out, flow jumper solder over the PC board to contact fingers for the instrument regulator, which can fail and leave a no-connection, loosen/ and retighten the gauge studs several times.

Inspect the harness connector pins on the PC board and solder them in place. There used to be a good thread on here about repairing those

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