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Old 05-22-2010, 03:11 PM
ethn_bert ethn_bert is offline
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The mustang uses four dual filament bulbs in the rear. The left two bulbs share a common ground and the right bulbs share a common ground. First thing first check all the bulbs for burnt/shorted filaments. Then lets check the voltage drop on the two signal/feed wires from the sockets back to the positive terminal of the battery. Then perform a voltage drop from the ground to the negative terminal of the battery. The black wire is the ground, the Light Green and Orange is the Directional and Stop, and the Brown is your parking lamps. Also, don't forget that the parking lamps in the rear share common circuits with the lamps in the front and the illumination inside the car as well. Start isolating sections of the illumination circuit and test them individually. What happens when the brake lamps are on and the turn signal is active? What about when the high beams are flashed with the headlamps off? Start checking these things and post the results in the forum so we can help. Good luck.
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