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Old 09-22-2021, 03:39 PM   #1
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Chassis Batteries Not Charging on AC

My chassis batteries are not charging while on shorepower. I recently changed out my battery isolator solenoid with a Ametek model as suggested by Silverleaf.



What charges the chassis batteries while on shorepower? Where is the fuse for this system?



The House batteries are fine are are holding at 13.2.V Silverleaf says the chassis batteries are 13.2V but they are way below that on a meter.



Could I have wired up something wrong on the isolator relay?
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Old 09-22-2021, 04:04 PM   #2
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The chassis batteries are normally charged by the inverter just like the house batteries.
You may be a fuse somewhere in the line going to the chassis batteries, however on my coach there isn't any.
You say a meter shows a low voltage while the Silverleaf says the voltage is good. Have you tried to start the coach? That test should confirm which is right.
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Old 09-22-2021, 04:35 PM   #3
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The coach would not start earlier today and the dash would not light up so I am sure the chassis batteries were way down. I am charging them with a dumb charger for a few hours to make sure they are fully charged.
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Old 09-22-2021, 05:12 PM   #4
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Just checked on it again. Silverleaf says House bats are 13.4 and Chassis 13.2. Wrong! Charger says the chassis bats are 11.8.
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Old 09-23-2021, 11:15 AM   #5
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Update:
I called Silverleaf and they ran me through the wiring on the soledoid. When I replaced the White Roders unit I put a wire on the wrong terminal. There is a fused (5A) line that runs from the solar panel for the chassis batteries to the isolator on the chassis side of the unit and then goes to the TM120 unit that runs the bridge (isolator solenoid). I put it on the House side when I replaced the unit so the TM120 never opened the bridge to charge the chassis batteries because it was always reading the House batteries and they were always fine.



If you ever have to change out this solenoid in a New Aire I have pity on your soul. Be prepared to work on your side or on your back while moving several wire bundles out of your way to even see the solenoid. You HAVE to remove all battery connections on both the house and chassis batteries. Newmar loves to run hot wires all over the place and if you don't remove the leads the isolator stays hot.



Once you cut the power you have to remove the unit from the wall and disconnect all the wires and get them back on the correct terminal when you install a new one. Take pictures if you have a swiss cheese memory like I do.


Hopefully, I have not damaged the chassis batteries.
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