LED's in rear turn signal comes on with parking light
03-27-2017, 01:31 PM
#1
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LED's in rear turn signal comes on with parking light
Here is the scoop, i got some LED's from amazon, they look good and work, i put 1156's in the rear tail panel, then when i put the 1157's in the front, looks good and works great with the lights off, then i turn on the parking or head lights and boom, the rear turn signal bulbs light up, but only with the lights turned on. could this be a resistance thing for the circuit or is there something else going on here, please help if anyone knows whats going on with my 85.5 944
03-27-2017, 08:23 PM
#2
Sounds like the grounds have a bit of resistance. Using a incandescent test light, probe the grounds of both parking and taillights would be the quickest way to find. Also try removing the 1157's from the parking light and see if the 1156's in the taillights go out of you are unable to find poor grounds.
03-29-2017, 02:18 AM
#5
Burning Brakes
Just a thought, there could be enough "sneak" current to light the LED 1157's but would not heat up the filament enough to make the incandescent 1157 light up. LED's do not require much current to become visible.
A sneak current is a very low current path, usually through some other device or circuit, that has unintended current flowing through it. It would be tough to find, but you could pull and replace each fuse to see when the LEDs go dark. Even after you have identified the fused circuit, it would take some work to find the culprit.
A bad ground can/may create a sneak current path, although I am NOT saying that is specifically the problem.
A sneak current is a very low current path, usually through some other device or circuit, that has unintended current flowing through it. It would be tough to find, but you could pull and replace each fuse to see when the LEDs go dark. Even after you have identified the fused circuit, it would take some work to find the culprit.
A bad ground can/may create a sneak current path, although I am NOT saying that is specifically the problem.
03-29-2017, 01:38 PM
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thanks for the info, the 1157 LED's do work fine in my ford, such as the brake light bulbs coming on without the brake pedal pressed, found out the there is a low current thru the cruise control module, the circuit for the park and turn is complex, i will be trying a load resistor also to hopefully cure the issue
