Quote:
Originally Posted by Acree
You certainly could have been testing the correct wire, but there are a couple of things to keep in mind. Depending on how your voltmeter was made, a pulse width modulated signal might display as a varying voltage. It depends on the sampling rate of the meter and how they calculate the final display value. They might display just the last voltage amount sampled, or they could use a moving average calculation, or any number of algorithms involving the last 2, or 3, or 4, or whatever number of samples.
The reason I believe you have your gauge tied to the wrong wire is because the brightness quickly returns to full after you stop adjusting the dial. This tells me that the pin is probably seeing the full 12v, which is what would happen on a PWM wire.
-Acree
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Do you have the gauge? Are you planning to check out the wires? If not, I can probably take a look at the wires again this weekend.