Turn Signals/ Headlights - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 4 (permalink) Old Apr 30th, 14, 6:40 PM Thread Starter
Anita Mckanic
 
Join Date: Dec 2012
Location: Idaho
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Turn Signals/ Headlights

My turn signal flash randomly when my head lights are on. When the headlights are turned off they work normally. Any ideas of what would cause that?
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post #2 of 4 (permalink) Old Apr 30th, 14, 8:18 PM
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Joe
 
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Re: Turn Signals/ Headlights

First thoughts are on questionable grounds and/or previous "hacking". But, before we can advise, what year and what model?. There's a big difference between the front end lighting wiring between a '67 Chevelle and '72 Chevelle for example.

-If you don't stand for something, you'll fall for anything.
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post #3 of 4 (permalink) Old May 1st, 14, 12:56 AM Thread Starter
Anita Mckanic
 
Join Date: Dec 2012
Location: Idaho
Posts: 8
Re: Turn Signals/ Headlights

69 chevelle. Not sure if it is a clone ss or a Malibu. The car had a new wire harness installed when I bought it but was not wired right. Would it possibly be in the switch or the ground wires at the signals
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post #4 of 4 (permalink) Old May 1st, 14, 7:14 PM
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Joe
 
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Re: Turn Signals/ Headlights

Ok, a '69.

Time to start inspecting the wiring and comparing it to a wiring diagram.

http://www.peachstatechevelles.com/c...club_id=549354


Your headlights have black wires that are the ground connections. There should be a connection from the black wires to the front core/radiator support by the headlamp connectors. Light green wires are high beam feeds. Tan are the low beam feeds. There should be nothing connected into these light green wires or tan wires other then the headlamp sockets.

Your front turnsignal/parking lights have their own feeds. Light blue = driver's side turn signal power.

Dark blue= passenger side turn signal power. Each lamp also contains a second filament--the parking lights, each have a brown wire feeding those. The turn/park housings need a good ground to the bumper assembly. If you suspect you have a bad ground, run a wire from the battery (-) to each housing assembly.

The side marker lamps also have brown wires (they also get power from the parking lamp circuit) as well as black wires. The black, again are grounds and need to connect to the core support/front sheetmetal.

The car's body needs a good ground for anything to work properly. This is a 12 ga. pigtail from the battery (-) to a sheetmetal screw on the passenger side fender with a tooth'd washer behind it.

-If you don't stand for something, you'll fall for anything.
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