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When say "dash light" I'm assuming you mean the nighttime illumination for instruments like the speedometer for example. If your truck has a stand-alone digital clock (not part of the radio) that has a feed wire from the instrument panel lights for it to dim at night, otherwise it'd be too bright. That could be a source of a short. The radio also makes use of the dash illumination as well, making the digital display darken at night and lighting the radio's controls and face plate at night, another source of a short in this circuit. Do not ever increase fuse ratings when replacing a fuse, that defeats the safety purpose of the proper fuse being able to blow, opening the circuit which prevents wires overheating and potentially catching fire. You don't want to go there. If you have recently installed another radio the wiring may be wrong. This happened a LOT on Pontiac Firebird's and TransAm's. People often wrongly assumed all black wires are ground and ended up grounding the dash illumination input. This blew the dash light fuse and made the retracting headlight doors stay up.
im am dealing with the smae thing i got an 87 lebbaron and i got to jump my car every morning cuz the battery dies over night but my friend who knows alot about car told me that the voltage regulator was built into the alternator that year so u have to replace the alternator or something im not sure but this guy does know alot about cars and if u find out let me know cuz like i said my car is doing the same thing
This was a fairly common problem with the early digital dashes and I believe the problem was with a circuit board inside the dash itself. A poor connection or crack in the circuit board would cause a loss of all the digital readouts and often the problem would come and go at random. There are some companies that repair these and other digital readout dashes so I would do an online search and contact a repair facility that specializes in this. I've never found anything that can be done to the outside of the dash [connections, etc] that would help the problem. Good luck, hope this helps!
Remove the distributor cap,check to make sure the plug wires didn't lift out of cap,Have someone turn engine over while you watch if rotor is turning. If those two things are ok,Lift rotor off distributor shaft,The ignition modular is the round black plastic piece under the rotor.It just lifts out and has a wire plug to undo.Replace this.
if it was me i would checkout a good salvage yard close to me or get on e-bay give this website a try its www.junkyarddog.com to help find a good salvage yard near you and do not forget to checkout e-bay wish you the best of luck Michigan Man.