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There are two diodes and two LEDs on the board. They should be checked with a multimeter that has a Diode Check selection. It looks like:
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and is usually a separate selection on the meter. Diodes and LEDs are polarity sensitive, so the reading will show a voltage in the forward direction (usually about 0.7V) and no reading in the reverse direction. For the diodes, the forward direction would be from the black side of the diode to the silver side. The LEDs just try one way versus the other.
Hope that helps,
Vin
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'07 Cayman
'90 911 - SOLD
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