Question about 1988 GMC C3500

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My signal lights didn't work on a 1988 gmc c6000 so I installed two lights to switch on off manually because there is no flasher unit or placed to plug one in. is there a way to make the lights I installed flash when needed automatically

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Sure,just place the flasher ,wire it in a series type of circuit.
place it in the hot or battery side wire,to the lights,but between the battery and the manual switch. If you place it between the bulbs they will flash alternately ,but not as bright.

Posted on Sep 09, 2010

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1 Answer

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1 Answer

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Try the flasher unit first, checking it costs nothing. Turn on your emergency flashers and if they work, get your owners manual and find the fuse panel locations. Inside the manual or the panel cover there will be a legend as to what is what. You will have two flasher units, one for turn signals and the other emergency flashers. They are the same units so just switch them, if your turn signals now work, but your flashers don't, then you have a bad flasher unit. Go buy another at any auto parts store and put it in the correct socket, you rarely use the emergency flashers so you want your new one in the turn signal circuit.

If that does not do it then you may have a broken switch which requires pulling the steering wheel off to fix. That is not an owner service thing. One bad light bulb is not going to knock them all out.

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1 Answer

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If you have no turn signal operation check the turn signal flasher unit. More often than mot this will be the problem. Your emergency flashers operate on another circuit with another flasher unit. The flasher units are very cheap to purchase and easy to gain access too.

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