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RWD - Charging Mystery Continues: 1993 Volvo 940

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Charging Mystery Continues: 1993 Volvo 940 900

Dear OnlyVolvo,

Hope you're well. "When the alternator is functioning properly and charging the battery, it gets very hot...".

This high temperature reading can mean: (a) the alternator, though new, is defective (internally shorted) and/or (b) a cable - that connects the alternator to the battery or to the ground - is corroded and so offering resistance that should not be present.

The thin red wire - that connects the alternator to the instrument cluster - provides the current needed to initiate charging. Thereafter, that current isn't needed.

Sometimes a re-built part is defective. That was reported recently, as to a starter.

I'd find a "known-good" used alternator, and install it. If a "known-good" alternator also over-heats, then I'd focus on the cables.

Hope this helps.

Yours faithfully,

Spook






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New Charging Mystery Continues: 1993 Volvo 940 [900]
posted by  onlyVolvo  on Mon May 13 23:04 CST 2019 >

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