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Charging system problems....newbie needs help! 200 1986

uid 18083's pic
posted by  lucid on  Wed Jul 4 00:18 CST 2007
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"After this I then did the checks that sdewolfe provided. The #13 fuse is good. The circuit between battery and #13 fuse is good. According to his instructions I was to hook the clip of my test light to the #13 fuse and then probe the D+61 terminal at the voltage regulator. When I checked the alternator I had a B+ terminal but no D+61"

The power to the warning lights changed in '86. The +12v for the warning lights no longer comes from fuse 13 or "crescent" plug "A".

The +12v now comes directly from the ignition switch to Terminal 3 of connector 233, which is the small, right-angle, 3-wire "push-on" connector at the speedometer. But since your lights work when you grounded the D+ wire, everything is good to up to the D+ connection point.

"When I checked the alternator I had a B+ terminal but no D+61." Yes you do—that's where the small red wire connects. The problem now lies between that connection and ground via the alternator regulator and "internals". Most likely short brushes or dirty commutator, as Art says.

--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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