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Old 02-20-2024, 01:36 PM   #1
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Battery isolator Manager

Next question now We are having trouble with the engine charging the house batteries !! Hopefully this is our last problem !! Thanks in advance!!
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Old 02-20-2024, 04:24 PM   #2
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Not much info to go on from this post. In any event, there are basically two different "types" of battery isolation relays. The older style which is just a relay (solenoid) that connects the chassis battery to the house battery when the ignition is on. The other one is actually a smart relay which can charge in either direction.

Since I have no idea which style you have I will just take a stab at the problem. You can EASILY verify whether you are charging anything by simply measuring the battery with a cheap voltmeter when the engine is running. Measure across the engine battery and then across the house battery while the engine is running. Should measure mid 13s to mid 14s. If it stays in the mid 12s, you are not charging.

I have attached some info I created for electrical troubleshooting. If you have the old style relay/solenoid you can find info here on troubleshooting that. I don't have anything on troubleshooting the newer style but I would say if it isn't charging when it is suppose to, just replace it.

Good luck!
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Old 02-20-2024, 07:06 PM   #3
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The relay control circuit has an inline fuse on the control wire. Usually near the relay.
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Old 02-20-2024, 10:53 PM   #4
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Jim, I think I might have said this before but it is worth repeating. Your guide is a great tool and very detailed resource. Thank you for posting and producing this for everyone to use.
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Old 02-27-2024, 07:03 AM   #5
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Quote:
Originally Posted by Gypsie View Post
Next question now We are having trouble with the engine charging the house batteries !! Hopefully this is our last problem !! Thanks in advance!!
. Thankyou for the info we read it all and tested everything !! We ordered a new a new battery isolation manager!! Will let you know when installed thanks again
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