I had to make a small modification to my wiring to get my front marker lights to work properly. I suspect this is because I converted the truck to LEDs and installed E-flashers like this one here.
For whatever reason my front marker lights would light up very dimly when applying the turn signals/hazards and would stop working completely once the parking lights or headlights were turned on. According to the wiring diagram, the front marker lights each have a blue wire and a brown wire. All the brown wires splice together with the other brown wires coming from the parking lights.
I used a multimeter in continuity mode (beeps when two electrically connected points are touched by the leads) and verified that all the brown wires were connected and there were no broken wires. I then tried swapping in a standard incandescent 194 bulb and it also blinked very dimly, but even more strange when the parking lights or headlights were turned on it would stop blinking but also my left signal light would stay on in the instrument panel, as if I had a burned out bulb.
I don’t recall if this was an issue with my truck before I swapped to LEDs and E-flashers but the wiring in my truck seems to be pretty much untouched which is why I think this behavior started once I installed them.
So to fix the problem I disconnected the brown wires on the marker light sockets from the rest of the lighting harness and connected them straight to ground instead. I left the blue wires alone.
Now the marker lights work as they should. I don’t like having to do stuff like this but I left enough length of wire at the bulb sockets and the wiring harness that it could easily be reverted if need be.
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