As others have suggested it is the ground to one of the main turn signal bulbs may even be a poor connection to the bulb in its socket. How it blinks the bulbs in an alternate sequence is easy to explain, well kind of. Okay first I will say my explanation applies to a front turn and marker on a 79 Chevy pickup. I’m not sure if your van is wired like this or not. Also at some point I think GM went with the wiring trend to have a separate circuit to both the tail lights and rear turn and brakes, which only effects the tail lights. So hear goes; in the case of the pickup the marker bulb has neither lead connected to a ground. One side connects to the + side of the turn signal and the other to the + side of the tail lights. So when the lights are off that side of the marker bulb is grounded through filaments of the tail light bulbs so the marker bulb blinks simultaneously to the turn signal. When the tail lights are on then the markers will blink alternate of the turn signal because the tail light side is powered and the turn signal then provides the ground through the bulb filament during the off segment of the blink. The filaments in the markers are smaller (more resistance I think is the proper term) so they light instead of the larger filament signal bulbs. Best explanation I can give. Clear as mud?? Lol!
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