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Old 10-15-2012, 04:52 PM   #1
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Unhappy National '04 Dolphin LX 6355 coach batteries not charged by alternator.

Tried to diagnose problem. Can't find any fuse going to distribution center. The solenoid is warm all the time, one of the small posts (yellow) is hot all the time, the other small post has no power. Does that indicate solenoid bad or something with circuit board. Need Help!!

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Old 10-15-2012, 07:59 PM   #2
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If your chassis battery stays charged, then it probably is the isolator. The isolator senses battery charge, and switches to send the charge to the one that needs it.
It is a small square panel with cooling fins that has thick wires connected to it. Check to see if current is going to and from the isolator. Get a good RV electrical book at Amazon, or borrow one from your local library.

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Old 10-16-2012, 09:01 AM   #3
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Where can we find the isolator on this model. Thanks for the info
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Old 10-16-2012, 05:08 PM   #4
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Thanks for the help. It was the solenoid and it is fixed.
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alternator, batteries, dolphin, national

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