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Where's the other end of the D+ wire?

posted by  runwld2 on  Mon Jan 10 10:17 CST 2011
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last visit: Tue Sep 30 13:11 CST 2014
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My question would be, are the headlights shorted somehow (unlikely if they work normally), or is the charging system so weak that their current draw is overwhelming the alternator.
I'd see if I could duplicate the low charging voltage by leaving the headlights off, put putting everything else on, window defogger, fan on full and check the charging voltage.
I might even take some old, other, headlights and make a "load" with them to test the charging system.
If the alternator is unable to put out full power (amps), take a look at the brushes, or then it could be a bad diode, (and check the belt tightness)..
--
84 242Ti IPD bars&springs, 89 745 16v M46 IPD bars, 89 744 16v M46 IPD bars, 93 945 Turbo AW71, 91 245SE AW70 IPD bars, 93 245 CLassic M47






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