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Old 03-08-2017, 02:21 PM   #1
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Alternator charging issues

Hey all.
02 Ultrasport Freighliner chassis 5.9 . Started coach and saw alternator was not charging. Looked it over and the plug from the two bottom studs on alternator was disconnected. easy fix plug it in still no charge. Put in new alternator and no charge? Hmm. Unplug that bottom wire and it charges. Only charges chassis Batts No House. The studs on back of the Leece Neville say (to key switch) and (to #1 terminal of Duvac).What do I have here and why it only works unplugged.
thanks
wayne
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Old 03-08-2017, 05:34 PM   #2
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Did you let it run a while ?

If it has a mechanical, isolation relay ( solenoid ), it will not connect to the house batteries, until the chassis batteries reach 13.2 volts or more. That is controlled by a small circuit board in the battery control center.

If it has a solid state isolator, possabily a hold over from the 90s, it would need the Duvac wire on, so it doesn't overcharge.
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Old 03-08-2017, 06:54 PM   #3
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TB Thanks.
I did let it run with the plug connected. all it did was run on battery power.Unplug it and it charges chassis batteries at 14.1 or so. I,m trying to figure out the Duvac system and what components it has. I can't seem to identify any components.

thanks
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