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Battery discharges

Tiny
JOHN 55
  • MEMBER
  • 1979 DODGE RAM
  • 0.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 63,650 MILES
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?
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Wednesday, May 4th, 2022 AT 2:43 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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

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Thursday, May 5th, 2022 AT 7:42 AM

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