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Old 04-16-2008, 02:50 PM
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Park lights

I have a '66 Mustang Coupe and I have a "strange" issue.

Whenever I apply my brakes the brake lights come on and that is a good thing.

The odd thing is the park lights on the front of the car also light up solid.

Anyone have any ideas why this might be the case?

As I understand it the park lights should only come on when the light switch is pulled out to the first notch or when you are signaling for a turn.

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Old 04-16-2008, 03:55 PM
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I think this is actually normal on the old Mustangs. There are a few Mustang guys on here, maybe they can validate this.

Chet
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Old 04-16-2008, 05:07 PM
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yea.. my '67 Falcon does that also.. I looked at the wiring diagrams a long time ago ( cannot find them now ) IIRC the wires for directionals/ stop lights went to the front also.. which would cause that.. I'm pretty sure it's normal... BTW '67 Falcon uses a Mustang wiring harness.
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Old 04-16-2008, 07:19 PM
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Quote:
Originally Posted by matt167
BTW '67 Falcon uses a Mustang wiring harness.
The Mustang IS a Falcon in disguise

Funny, I do not recall my 65 Mustang doing that.

But----I do not remember----do your dash indicators have a right and a left indicator?? Some only have a single indicator.

Perhaps there is a diode on the instrument cluster that has failed.

Just tossing this out---sold the Mustang in the early 90s---so I cannot be positive.

Bryan
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Old 04-16-2008, 07:42 PM
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I know the Mustang/ Falcon are 1 in the same.. makes getting lots of parts easy
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Old 04-17-2008, 07:57 AM
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"do your dash indicators have a right and a left indicator?? "

I have a left and a right indicator but I had heard some only have a single indicator.

Thanks for the advice.

When I get a chance I am going to make sure (again) that all the lights are working for breaking, turn signaling, etc and if everything is working like it should be (i.e. can pass inspection) then I may decide not to worry so much about the park lights coming on when the brakes are applied.

I need to consider eventually rewiring the entire car but would like to put that one off for a while to address some other issues first....for example my horn doesn't work, need to fix the wiper switch and address a small spot of rust or two.
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Old 04-18-2008, 05:32 AM
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I don't know Mustang wiring well enough to give you a definite answer, but on most cars this type of problem is due to a disconnected ground. If a ground wire is missing from the front lights, or from somewhere in the dash panel, the current might be finding a alternate path to ground through the brake lights.

When Ford first added emergency flashers (about '66?) there was a wierd wiring loop that I discovered as a kid. If I turned on the emergency flashers, stepped on the brake, and I think also turned on one turn signal, I could run the radio without having keys in the ignition. This was very useful when I was stuck in the car waiting for my parents.

Bruce
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