1993 Pontiac Grand Am dash light dimmer switch burned out
All lights no car work fine, but the dash is dark except all the warning lights work and the "shift now" light comes on normally as does the high beam indicator. The problem is that the dash dimmer thumb wheel switch and on/off thumb switch on the dash is burned out. GM no longer makes this part. Other than a junk yard, any ideas where I could get (hopefully a new) replacement switch?
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check that dimmer is turned up ---and check connections around where radio work was done for damaged disconnected line connector also check dash fuses not just fuses from radio --or your radio may not be compatible to your dimmer circuit -most oem radios display are Incorporated with dash functions and after market ones are not
there is a regulator for the display brightness, you may have it turn'd down or it has stopped working;. it controls the brightness at which the dash lights are. usually has a speedo sign on it. goes up and down. it works with the main light and is conecter to them on the same lighting board if it has gone then a new light swtch control switch will be needed.
Your shifter is a column shifter, not a floor shifter, right? Is the headlight switch mounted on the steering column? If so, then this "combination switch" may be the problem. If not, start looking for loose wires, especially ground wires, around the steering column area and the headlight switch area. It would also be a good idea to get access to a wire diagram from a factory repair manual and find out if GM had any Technical Service Bulletins addressing this problem. If I get a chance, I will ask around and see if any of my co-workers ever heard of this problem.
Are your "Park" lamps working on the outside of the car? If not, then you probably have a problem with your headlamp switch. If the park lamps are working, then the problem is most likely with the dash light dimmer switch.
take a look at the dash ground wire located next to the right of ebrake release handle. if the bole holding the ground wire is loose, which was quite common it will cause all kinds of feed back problems, like described in the comments section to your question.
The daytime running lights are on whenever the key is on and they use the high beams at reducd voltage. Turn the lights on at night and the turnsignal stauk pushed to the speedometer is high and back towards the driver is low. turn the lights off and the highs come on at reducd voltage as the daytime running lights. It's law in most states and many countries to run with the lights on if the car is moving. Pushing down just one click on the parking break pedel should turn them off. the ambiant light senser can be bad or damaged and the high beams stay on the senser is i the center of the dash right up to the windsheild, If it detects darkness it should switch the lights to full power lowbeams. automatically. there is no turn off for the lights except to turn the key off. If they stay on with the key off and the light switch off then the headlight relay can be sticking and its in the underhood fuse relay center and it's location is marked on the lid and it's called the DRL relay their are other relays in the box so you can just substute a different one to see if that will fix it and if it does get a new relay. the lights should work normally if they are turned on and the high beams should be brighter.