Originally Posted by clr
If all the lights work except the stop lights, you do not have a problem with the 7 pin connector except just maybe a bad ground. Here is why the tail and running lights work thru pin 3, the left hand turn and brake light is on pin 5 and the right hand turn and brake light in on pin 6. So if both turn signals work the 7 pin connector is not the problem. In the old light bulb days you had a single bulb on each side of the vehicle with two filaments in the bulb. One filament was for the tail light, the other was for the turn signal. When you stepped on the brake pedal power was sent to both filaments in both bulbs at the same time. This is the same as the LED lights work today as far as the wiring and connections to the TV goes. Hopefully this helps with the trouble shooting here. With the LED light unit there are blocking diodes and such associated with the lights and I would need the part number of the light assembly or schematic to tell what is going on inside the light unit.
Partially "mostly" correct.
Two filament bulb.
One filament is for running light. Period.
Other filament is for turn / brake.
08 duramax tuned n modded
2011 32bhok Sabre
2015 camping "9 nights"