beemerphile1 wrote:
I think the LED change is only coincidence, you have a bad ground in the trailer.
Try again.
OP HAS a 2011 F150 Ford Truck..
Ford for MANY years (at least back to 1997 uses RELAYS for the trailer lights..
NOTHING on that trailer wiring should affect how the truck lights work or operate.
I think it is coincidental at best when trailer is connected that the truck lights misbehave.
The problem IS the aftermarket LED lights on truck.
Put the original incadescent lights back in and problem should go away.. PROVIDED the LEDS did not DAMAGE the BCM (Body Control Module)..
All of the lights on the truck are directly connected to the BCM and the BCM is easily damaged..
If the BCM finds a fault in any of the outputs it WILL temporarily disable the output.
If the fault continues to exist the BCM CAN PERMANENTLY DISABLE THAT OUTPUT.. When that happens REPLACEMENT of the BCM may be the only way to restore the function.
But as I mentioned before, ALL of the lights on the trailer side ARE connected via RELAYS so the trailer lights are not directly connected to the BCM.. This prevents the trailer from damaging the BCM by accidental overload or shorts.
Not a good idea to mess with modern day vehicle electrical systems.
