battery discharges

1979 DODGE RAM
63,650 MILES • 0.5L • V8 • 2WD • AUTOMATIC
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JOHN 55
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  • 1 POST
This is a 1979 dodge flair motorhome with 63,650 original miles on it. I replaced the alternator; it runs idling until it discharges battery. i didn't check fusible link at battery unplugged shuts off immediately after. What's the problem?
May 4, 2022 at 7:43 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

I don't know if you know this; removing the battery cable while the engine is running never tells you anything and can damage the modules from a voltage surge.

Use a test light or voltmeter and verify the power to the back of the alternator. The engine should die when the battery is disconnected.

I attached a guide for you on the charging system. It gives you good information on testing.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

https://www.2carpros.com/articles/car-battery-dead-overnight

https://www.2carpros.com/articles/car-battery-load-test

With the engine running, you should have 14 to 14.5 volts. Please confirm that and let me know.

Roy



May 5, 2022 at 12:42 AM
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