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

posted by  dinomartino on  Sun Jun 19 19:52 CST 2011
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last visit: Fri Oct 24 04:43 CST 2014
[RELATED]

If the big (B+) wire is showing deterioration at the connector, by all means replace the connector and crimp to nice freshly-exposed wires. I recently had one break off with just the slightest touch of my finger. But the fact the system fails to charge until you cross an RPM threshold indicates a fault in the exciter circuit. Inspect the small red wire (D+) on the back of the alternator, and again where it passes thru the grey plug connection on the firewall behind the intake.

I recently had charging woes on a 1988 245 that turned out to be from a poor electrical connection where the L-shaped three-wire plug attaches to the back of the cluster.

john
--
1989 245 233K / 1993 945 127K






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