Question about 1966 Ford Mustang

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When I depress the brake pedal the instrument

66 Mustang
When I depress the brake pedal the instrument illumination lamps light. Makes no difference if the ignition switch is on or off.

Also, if I have the right turn signal selected, the right turn signal works properly until I turn the parking or headlamps on. The turn signal lamps front and rear do not flash but just stay illuminated as long as the park or headlamps are energized. If you turn off the headlights and parking lights the right turn signal begins to work properly.

The left turn signal works properly.

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  • Ford Master
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Sorry but i have actually worked on one of these 30 yrs ago a straight 6 and it was the foremans son in law and we had problems similar to this and in the end we stripped the loom and rebuilt it ,wasnt difficult except iam colour blind so i tagged all the cables .Now please remember that the english one many moons ago had a different wiring system with proper indicators as it had to conform to uk law and the flasher and stop lights had to be separate .Now before you start playing with it and getting yourself confused i would be inclined to remove the rear light units and check for corrosion because i think it might have a corroded earth connection either in the light units or on the earth grounding point being corroded so the lights are earthing out down another circuit rather than to ground hence the stop lights putting the side lights on and the flashers which interupt the stop light so take the light units off and start looking ,also make sure the connections have a bit of vasaline on them .Best off british with it i dont think this is a complicated issue at all and i only wish you was local as i would do it for free just to say i have worked on one when i go for coffee with all the other mechanics and we tell tall stories

Posted on Jul 30, 2010

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The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

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The stop lamp switch contains two switches monitored by the PCM. This will cause the issue you are having. It will illuminate the engine light also and cause the transmission to go into limp mode which is what's happening. Have replaced many for this same exact issue. This is what needs to be done next. The engine and ESC light come on together.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

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