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Old 05-09-2013, 08:43 PM   #15
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Wall mounted hen weigh.
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Old 06-03-2013, 09:20 AM   #16
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Ok, finally got around to replacing the isolator. Checked voltages on the lines going into the left side of the isolator with engine running and got 15+ volts, but just a trickle coming out of the right side which I assume is the house battery. However, when a removed the second wire (the one I assume is the alternator feed) from the left post and connected it to the center, almost all voltage dropped to below 1. Got the same reaction with the new isolator in place. I'm wondering if the alternator is thinking no charge is needed since the isolator would block return current? Appears to be three posts on the back of the alternator (160 Delco Remy 28SI). Took pictures but forgot my cell phone at home today. There is a smaller red wire coming off the back that is not connected to anything. Also the main wire that should be going directly to the isolator disappears under the coach into a mass of about 100 similar looking wires, distination unknown. With current of 15+v when I first checked the 'bad' isolator hook-up, I am guessing that this is the alt cable on the return trip from who knows where. I will try to get those pictures of the back of the alternator posted as soon as I can.
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Old 06-03-2013, 10:11 AM   #17
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Remove the 3 larger wires from the isolator. Be careful. With the engine running the wire with 15 + - will be the alternator. That goes on the center. One of the other wires is the coach battery and should have the same voltage as the coach battery with shore power unplugged. The last wire will go to the chassis battery and should have that voltage on it. If you have 0 volts on either wire you have a broken circuit to that battery. If the voltages are correct, they go on the outer terminals of the isolator. To check the isolator, voltage is allowed to go from the center to both outer terminals but not back. An ohm meter will clear this up quickly.
Good luck.
Tom
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