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Old 06-13-2011, 05:53 PM   #1
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Location: Bremerton, WA
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Coach Battery goes dead on drive

I have an 87 Allergo Bay MH with a 454 P30. Last weekend we took a 3 hour trip to the campground on Friday and came back on Sunday. On the way back we had to pull over for an overheating issue (taking to mechanic on Wednesday for that) and when we stopped at a Flying J the engine wouldn't start (coach battery was dead). Now the battery had a full charge when we left and I had no issues starting on Sunday morning.

My question is: Could I have a bad alternator? I put a charge on it when I got home and it started up fine.

Thanks as always

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Old 06-13-2011, 07:05 PM   #2
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A bad alternator would be one likely cause, but that could include a loose or broken drive belt for the alternator.

If you measure the battery voltage with the engine running, it should be 13.6v or more if the alternator is putting out any charge at all. However, there is a mode of failure (diode failure) in which the alternator puts out standard voltage but very little charging current, maybe only 2-3 amps. Your coach will use more than that when driving, so the battery goes dead after awhile. You will need a professional alternator test to test for that problem. Most any auto parts store can do ti for you - usually free.
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