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Re: ford 1999 e 150 taillight issues
Check to see if the emergencey flashers are turned on,and they do not work.In other words,if the flashers do not work,and the flasher button is on,the lights would not work unless the brakes are applied.Also,check for a fuse to be out.
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Find the brake light switch mounted on the bracket right above the brake pedal. There should be power on the light green with red wire all the time. If there is no power check fuse 23 in the central junction block. If there is power check for power on the tan with black wire with the brake pedal depressed. If there is not power replace the brake pedal switch. If there is power there than it is possible that all the bulbs are burned out or there is a wiring issue to the rear lamps
there is a switch above the brake pedal that turns the brake lights on when u depress the pedal, use a volt meter set to DC volts and check for voltage to the switch and out of it when the brake pedal is depressed, see p[icture of switch below
The outer lights are dual filament bulbs, meaning they work 2 separate functions, brake and running lights. Either filament can burn out separate from the other, thus creating the situation you have. Replace the bulbs and your problem should be fixed.
Check the brake light switch. It should be energized when the switch is depressed. (constant power in and power out only when pedal is pressed) Taillights and signals power through the steering column and light switch. BUT first check the fuses. I seem to remember there being a fuse for the truck brake lights and another for the trailer brake lights. Use a tester and check trailer wiring brake lights. If they work, look for the truck brake light fuse.
assuming you have brake lights and marker light, I would check the socket for voltage, both the contacts and probe the wire (Brown) for voltage...it could be a bad socket.... if no voltage, trace the "Bwn" wire back and keep probing til you find voltage, check the connector in the trunk on the LT/RT side also...hope this helps you...GL
1. Check for power to the turn signal switch on the White and Yellow wires with the brake pedal depressed. If low voltage, check the stop light switch operation on the brake pedal. Check the Center High Mount stop light (CHMSL) circuit operation.
2. Check the black wires at the turn/brake sockets for a good ground.
3. If all OK, check for a bad frame ground to battery negative.
4. and dont forget to check the rear bulb
Both issues would seem to be a loose/corroded connection and most probably the grounding. The brake light is part of the taillight. Most taillights operate with dual filament bulb (3 terminal). The metal
body of the bulb bottom is usually connected to the body ground. The
correct procedure would be to trace the wiring harness from the
taillight and determine which is the ground and verify that the
contacts are clean and free of corrosion. An alternative is to add a
grounding wire from said metal body of the taillight bulb and attached
to any bare metal/chassis/body in the rear. The same loose ground could cause the inconsistent battery indicator.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.