This is driving me nuts.
My passenger (R) brake light keeps burning out. But just the brake filament. The running light filament in the bulb is fine. I've tested voltage at both circuits coming in to the bulb and measure 11.4 - 11.6 V with ignition off and 11.6 - 11.7 V with the engine running. Both the brake circuit and running light circuit read about the same. The drivers side (L) taillight works normally reads about the same voltage. The turn signal and reverse bulbs are OK and work normally. The third brake light on the hatch works.
Here is what I've done aside from measuing voltage
I can replace the bulb and press on the brake pedal and it works normally.
I can start the engine, press on the brake pedal and it works normal.
I can turn on the headlights and it works normal.
Once I start driving around, the bulb blows. It blows whether the headlights are on or not.
I completely disconnected my aftermarket trailer harness. No change.
I've traced wiring and continuity back to the BQ1 connector and cleaned the trailer socket.
I assume that I'm getting a voltage spike while driving, but I don't know how to diagnose that or measure it.
Any Ideas as to where I should look next?
My passenger (R) brake light keeps burning out. But just the brake filament. The running light filament in the bulb is fine. I've tested voltage at both circuits coming in to the bulb and measure 11.4 - 11.6 V with ignition off and 11.6 - 11.7 V with the engine running. Both the brake circuit and running light circuit read about the same. The drivers side (L) taillight works normally reads about the same voltage. The turn signal and reverse bulbs are OK and work normally. The third brake light on the hatch works.
Here is what I've done aside from measuing voltage
I can replace the bulb and press on the brake pedal and it works normally.
I can start the engine, press on the brake pedal and it works normal.
I can turn on the headlights and it works normal.
Once I start driving around, the bulb blows. It blows whether the headlights are on or not.
I completely disconnected my aftermarket trailer harness. No change.
I've traced wiring and continuity back to the BQ1 connector and cleaned the trailer socket.
I assume that I'm getting a voltage spike while driving, but I don't know how to diagnose that or measure it.
Any Ideas as to where I should look next?