Question about 1987 Chevrolet Caprice

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1987 Chevrolet Caprice Wiring diagrams

My left turn signal has a short in it and I'v tryed all I know so now I'm looking for a Wiring diagram so I can go over the wiring if you or anyone has any info that can help me it would be appreciated

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First i need to know a few things then maybe i can help you. first is, does it blow the bulb? secound does directional light work on insterment panel? third does left rear taillight lightup or blink? and fourth does passenger side work? could be easy fix but i need this info.

Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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Two possibilities , short to ground on the black with yellow trace wire or the rear electronic module is shorted to inside to ground . The easiest way to find the problem , find the rear electronic module an disconnect connector C420 e ,if the light goes off the problem is with the module , if not wire is shorted to ground. Does this sound complicated ? It's not really . The (REM) this module is located in the trunk. Remove the carpet lining on the passenger side of the trunk, the module is bolted inside the quarter panel. You will need to look at a wiring diagram to double check the wiring (so you know which connector to remove) Here is a web site for free wiring diagrams http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model and engine size. Under system click on lighting , under subsystem click on turn signal lamps .Then click the search button ,then the blue link . Scroll down to the fourth diagram . At the bottom of the diagram you will see the rear electronic module .On the top ,right side is the grounding wire for the right rear turning signal ,connector C-420 ,C stands for connector . The wire is in pin #4 of that connector . Find that connector an disconnect . Does the light stay on or go off . Let us know what happens .

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Get a wiring diagram from the Free portion of the Autozone site. It is a little work to separate the Help categories at the bottom of their Webpage.

I have heard of SOME 4-way flashers that are built into the turn stalks causing problems. The contact pins for the turn signals are shared as 4-way flasher pins. Try clicking the 4-way flashers off/on about 20 times and then use the left turn signal. It has been known to reseat the contact pins.

The wiring diagram I mentioned would show where the tailgate top light gets its power. One feed should go to the brake light switch for the brakes and another feed should be the flasher feed.

As I see it, you have 2 extra lights going on when you use the left turn signal. Those 2 lights are the tailgate light and right turn signal. The wiring diagram should show the places where the wires are close enough to cross. I am thinking the 4-way flasher is the only place where the top tailgate light gets flasher power; the rest of the time the tailgate light is a Brake light.

I do not want to spend your money on an unnecessary turnstalk and that is why I say to look at a wiring diagram and see if there is anyplace where the wires could cross.

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Would like to know what you found.

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This means you have an electrical problem ! An without doing some testing with a volt meter an looking at a wiring diagram to isolate the circuits from the ones with the problem i would be guessing , just like anyone else on here would be doing . Do you know how to do automotive electrical testing ? How to read an use a wiring diagram .It is true a bad diode inside the alternator can cause excess AC voltage ripple , causing lights to flicker ! If i were to guess i'd say there is a ground issue and voltage is back feeding through one of the lamp circuits . But also looking at a wiring diagram i see the brake light switch feeds B+ voltage to the center high mount stop lamps and to and through the turn signal switch .to the right and left lower stop lamps . Pontiac grand Am's had multifuction switch problems that caused similiar problems . Check the grounds first , do you know what a body ground is .
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SOUND LIKE WIRE PROBLEM.YOU NEED A WIRE DIAGRAM TO CHECK THE TURN SIGNAL SWITCH WIRING DONT PLUG A WIRE IF YOU DONT KNOW WHERE IT GOES COULD CAUSE ELECTRICAL BLOW OUT.TRY TO GO ON LINE LOOK FOR AUTODATA DIY COM LOOK FOR ELECTRICAL DIAGRAM.

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I can't look up your wiring diagram because I don't know model year?
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W/o being able to look at wiring diagram, I don't know if my info is applicable on your vehicle? I need model year.

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