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Old 09-25-2006, 06:43 PM
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One Eyed 67 Mustang

I got my headlights and front parking/signal lights to work - almost. Still using the original harness which leaves a lot to be desired, thats for another upgrade later on.

However, the headlights and signal lights harness are intact and there - only problem is the left headlight is about 50% illumination on both hi and low, and when you turn on the left signal - the headlight goes on and off with it.

The only other anomoly is the left turn lamp indicator on the dash is illuminates when you turn the light on and the hi beam inidactor on the dash is on as well? Any suggestions where to start? I am about as good as, got power yes or no - find it fix it - but intermediate or partial power has me stumped.

Thanks, Gydyup!

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Old 09-25-2006, 06:50 PM
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you have a ground issue. the ground wire on the external volt regulator is likely loose or corroded, it will directly affect the left light. My '67 Falcon had a dim left light, I put 3 lights into it ( all used but were good that I knew ) and it still stayed dim. I noticed the ground lead on the volt regulator was loose, tightened it up and it was 100%. I had replaced the regulator and never tightened it up ( I changed it 9:00 at night, middle of winter and was about 0* outside, I just wanted to get it done )
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Old 09-25-2006, 07:40 PM
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Doc here,

Sounds to me like you have the left headlamp power and the left turnsignal wire reversed..If the indicators are staying on with "Headlamps " only..

Pull the headlamp plug, turn the key on, and with your DVOM set to DCV, V x 50..measure the lamp socket from both high and low WITH the turnsignal on..If you read a voltage, you have a cross-wire between those two circuits..

Troubleshoot and repair.

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