During the day my brake lights work, but not my rear signal lights. when i turn on my head lights, the brake and signal lights will not work. my signal lights in front work all the time, but they blink real fast. i checked my fuses on the dash panel box, all are ok. i checked under the hood and those fuses were ok also, but i do not know about the square big multi pronge fuses. i replaced my rear tail light bulbs also even though my old ones were ok. could there be a loose ground wire or a bad brake relay somewhere i do not know about? my truck is a 2003 ford ranger thunderbolt.
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check the light bulbs (filiments can break and touch the other filament in the bulb and backfeed other circuits) if they appear ok remove the non working bulbs and swap positions with the working bulbs and see if anything changes
Sounds like you have 'ground' issues. Apply the brakes using a broom stick or more apropriate tool so that the brake lights are activated. Then go to the brake light that is not bright enough. using a test-light with a sharp pointed probe, poke the ground wire close to the bulb (usually a black wire) make sure the test light is attached to a grounded bolt. if the brake light gets brighter with ground added, you need a new ground wire. Splice it in to the existing wire & attach it to a bolt. Lights should work better with proper ground. (each bulb has a positive post & neg. post, don't add ground to the side with power coming through it from Battery (+)(red light on test light) - probe wires FIRST with test light to find (+) POS. Hot wire, and leave that one alone.
I think you have a bad ground at the back on both rear lights or their earth out on the same connection but these american cars use a funny system where the stop lights are the indicators and not a seperate yellow light like europeon motors ,Now these brake light switches also allow the indicators to work by shutting off the feed to the stop light so it flashes with indicators ,Why american cars use this system i dont know as its so complicated for the stop light switch function but try the ground or earth wire on the back lights and if no joy then ask a american mechanic with experiance of this sort of circuitry as when i get american cars for import i have to fit new back lights and disconnect the brake light switch .
It sounds as if you have a bad earth to either one or both of your rear light clusters. If it only happens when you indicate in one direction then that is the offending side.
The ford explorer sport track. Will have a short either at the plug of the multi-function switch or 6 inches down where the column bends the wires during tilt.
I have a 2000 ford focus no brake lights. with the brake lights the transmission would not go into drive .replaced the brake light switch checked fuse replaced turn signal switch with no results then i moved onto the wiper switch and replaced it as much to my supp rise it fixed the problems
Does the turn signals or hazards work in the rear?? Yes... it may be the brake switch or the turn signal switch (power goes from battery, to the brake switch then to the turn signal switch, then to the lights. No? .. again.. possibly turn signal switch or the wiring between cab and bed.
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