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Today I wired my ex-low oil pressure light to turn on when my brake vacuum pump turns on. The vacuum switch was already grounding the vacuum pump relay coil, so why not use it to also ground the unused idiot light? This will give me a nice bright indication that the pump is on when I am driving at such speeds that the road noise is to noisy to hear it.
However, much to my delight, I killed two birds with one stone. With the vacuum switch now carrying the current of the added light bulb to ground, the relay chatter that occurs when the pump turns off is for some reason completely gone now. I thought the chatter was some sort of vacuum pulsation/incorrect placement of the vacuum line to the switch issue, but it turns out that it was some sort of electrical inductive issue, probably caused by the coil in the relay.
Weird.
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