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onZedge onZedge is offline
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Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,304
The blue wire from the alternator is supposed to go to that two-pin connector. From the other side of that connector, the blue wire goes directly to the charge light bulb in the instrument cluster. The charge light bulb is an incandescent bulb which varies resistance with voltage, and is an integral part of the charging circuit.
Note that the charge light bulb must be incandescent and should never be replaced with an LED style bulb.
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Edek
'87 924S
'91 535i
Old 12-08-2017, 08:16 PM
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