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Wiring help I have two light switches adjacent to each other, one is a dimmer. Both switches work independently fine, but if l try to have both lights on together, the other light switch will turn off. I need to have both of them work at the same time some times. one of the wires must be wiring incorrectly?

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What kind of viehical lights going to what ?? dash headlites interior lights ?? cant see your car from my house .

Posted on Nov 22, 2013

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you must check the wiring of the lamp..maybe the wire of the lamp is short or graunded

Posted on Mar 22, 2009

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why not just replace the turn signal switch must faster and safer . buy one from your local parts house then you can see its not that easy to install but you can do it with a little help

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air conditioner 2500 silverado in dash not working

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1986 suburban headlights don't work. Brake lights and backup lights work fine. Replaced dimmer switch n blew fuses somehow... Help?


Very often the light switch itself is the culprit. Try replacing it after looking for wires rubbed bare working back from both lights

May 09, 2015 | Cars & Trucks

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Two light switches but only work seperately?


I would like to help but that is vague at best and I would imagine that they should be working independently. A dimmer and a standard on/off switch.

Nov 22, 2013 | Cars & Trucks

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Tail Lights will not always illuminate; seems to have a short in dimmer switch


This is not necessarily your dimmer switch. Most manufacturers tie the dash lights to the tail lights so that it warns you in a visible way if your tail-lights are not working. It sounds more like you have a power supply problem unless working the dimmer switch actually causes or resolves the problem. Chances are you either have a shorting power wire, or a mostly broken wire that is only making an intermittent connection. If it was constant I'd suggest checking fuses but with an intermittent issue, The only way to really check this is to start tracing wires and testing power along them when it's not working. Wiring diagrams help a lot.

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1994 silverado illumination on instrument panel doesn't work, parking lights and tail lights do not work but headlights and brakelights work fine. All fuses are good. Is this a bad dimmer switch?


No. Dash lights being out could be a bad headlight switch, since the dash lights are routed through the headlight switch, not the dimmer switch. Park and tail lights also controlled by the headlight switch.

Oct 23, 2012 | Chevrolet Cars & Trucks

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Dash lights do not work 2000 ford exploier


All go out at once, first check fuses,then dimmer switch for dash lights, finally headlight switch. To check dimmer switch, pull connection off back, on harness with test light and headlight switch activated, 1 of the leads should have power, if so, use ohm meter on dimmer to make sure it has reading between 0 and some value, if no value, open, dimmer is bad, if there wasn't power then check headlight switch, there should be heavier gauge wire that powers switch and 1 for output to hi/lo switch, smaller gauge wires for tail lamps, dash lights, license plate lamps, parking lights. The color wires from dimmer would correspond to the same colored wires on headlamp switch, probe that connection on headlamp switch with switch engaged and see if you have power, if not replace switch, if so, check wire from switch to dimmer.Now if the lights slowly went from bright one day, to less bright some other day, to not working, then the bulbs are bad... good luck...

May 14, 2012 | Cars & Trucks

1 Answer

When i turn on the wipers and the radio they work fine ,when i turn the light switch to road position and hit the dimmer switch the radio and wipers stop working.The blower motor work fine at any position....


Sounds like bad ground , try re-grounding radio and see if that helps. make sure you have a ground wire from battery negative to car body and ground from body to engine, lot of time head lights are bright when you rev the engine and goes dim at idle. but i'm sure this is a bad ground problem

Mar 22, 2011 | Ford Explorer Cars & Trucks

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The headlights only work on Bright. The dim


If the low beam head light relay is fine,and the dimmer switch checks out fine,then look at the out put wire from the dimmer switch to the head light relay,check for voltage,then check the relay to see if it energizes.Then follow the wire(out put)from the relay to the head light.Now if power from the dimmer is getting to the relay,but the relay is not energizing,look for a bad relay,or bad relay ground wire.

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Check out the Dimmer Switch Assembly - it may be faulty or there may be a short. I had a simular problem - resolved by replacing.

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do you have taillights? most of the time there on the same fuse. also chk. to see if plug is all the way in on your headlight switch.

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1 Answer

2000 S10 ZR2


Replace the dimmer switch insid ethe dash it is usually separate from the headlight switch in these trucks. If not then get a known good switch out of a simial truck from a salvage yard before buying a new one and try that first. it could be that the wiring somehow got damaged. This is the only thing I can think of that may be of some help. the service engine light runs off the computer system where the other lights are illuminated from a separate circuit but if the dimmer control switch is moved and they work it is in that system...a short or a bad switch.

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