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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 10-11-2013   #1 (permalink)
batfink0 is offline Rookie


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Default Brake Light malfunction 66' Coupe

Odd thing here...
My left brake light doesn't come on unless the right signal light is on.

Side note....
Both signal light works, as well as the park lights...

Any ideas?
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Unread 10-12-2013   #2 (permalink)
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Try replacing the bulb and check the ground wires for the lights. Make sure the bulb is installed correctly as well. It should be a 1157 bulb.
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Unread 10-12-2013   #3 (permalink)
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Either the turn signal switch is bad or something is wired incorrectly. Use the wiring diagram link on the previous page and a voltmeter to find out what is going on.
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Unread 10-12-2013   #4 (permalink)
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When was the last time everything worked correctly? What has been done since then?

These classic Mustangs used a 2 filament bulb to do 3 things. So the wiring is not easy to understand unless you really work with it. I had to draw my own simple version to get it, which I just scanned and attached.

Sounds like you have a chaffed wire problem or a bad turn signal switch. The stop and turn wires combine at the turn signal switch


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Brake Light malfunction 66' Coupe-back-end-wiring-diagram-1966.gif  
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Unread 10-12-2013   #5 (permalink)
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Default suggestion

Check bulb- it has two filaments: One turn one stop.

Check ground on left brake light.

This can be done by using a jumper wire from ground of bumper or other ground and other end to Brass Receptacle of light- which is ground, then apply brakes and have some one check to see it lights are on. Bad grounds can cause strange results.

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Unread 10-12-2013   #6 (permalink)
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Hello. It is true that the tail lights have a two-filament bulb, but, the turn signal and the brake lights use the same filament. If either the turn signal or the brake light works, the problem is not the bulb, or any wiring issue in the trunk area. What you have is almost certainly a bad turn signal switch. If the problem was upstream from the turn signal switch, neither brake light would work correctly, because there is only one wire going from the brake light switch to the turn signal switch. If the problem was downstream from the turn signal switch, both the brake light and the turn signal would have the same problem on the same side. Since both turn signals work correctly, that means that the problem isn't down stream from the turn signal switch. That leaves the turn signal switch.
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Unread 10-14-2013   #7 (permalink)
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Thanks all.. Special thanks to 'Driveway'
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