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240 Battery light stays on and doesn't charge until rpm's brought off idle

posted by  pittroj on  Wed Jun 29 03:44 CST 2011
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last visit: Mon Oct 20 07:18 CST 2014
[RELATED]

When this first started, the batt. light would come on, and stay on until revved
off idle, then it would charge at 14v. Now, the batt. light comes on,
(sometimes, not every time) but charge voltage only reaches 12.5v. I have read
this could be a symptom of a problem with the exciter wire, and have done a lot
of reading on it. I have 0 ohms at the gray connector at firewall from the back of the
alternator on the red exciter wire. The battery light lights, so wouldn't that
indicate the wire is good to inst. cluster?

I have a good battery in the car, and autozone tested the alt. and says it is
good, but I am having my doubts. I have ohmed out all of the other wires from
various post that I have read, and checked all grounds. Used dielectric grease
on all connections, including the 25 amp fuse on fender well, which also ohmed
out good everywhere. I pulled all spades off the batt. dist. block, and assured a good connection and used dielectric grease on them.

I found
this old thread about a similar problem...http://www.brickboard.com/RWD/volvo/13
85648/220/240/260/280/link_good_wiring_diagram_observation.html,
and was wondering, if this schematic is saying that all bulbs must be in and
working for the exciter circuit to be complete? The PO removed some bulbs in cluster, one for sure being the SRS bulb I have ohmed the alt. wires to
the batt, checked chassis, and block grounds for the alt.Any suggestions would
be appreciated.






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