I've had the same results. I've had 3 of them die the same way now. Sucks as I like the way they work but don't last long. I have stopped using mine all the time and just use them at night. The new A5 hemmet trucks use a new projector light. Should be better but I have no idea of the cost.
It's the high amp draw at startup with the gp's on and the battery already drawn down from gp prestart and cranking. You are asking the alt for its max output and the belts just slip.
Tighten the belts.
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