Quote:
Originally Posted by 4v6
Blue wire is "alt ind" for the dash light iirc.
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Also field excitation - if it's not connected (to the M6 terminal with an M8 nut) the alternator won't charge.
The ur-quattro is not a good source - different model years are wired differently. The 20V wiring diagram is the best - the alternator is shown as not even connected:
http://www.isham-research.co.uk/quat...yp85/47_01.png