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Old 09-17-2015, 06:14 PM   #1
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Help! heater won't work!!

Greetings folks! I need help! I have a 2000 Forest River Tent trailer 620, and the heater & lights just stopped working when the generator is plugged in. The lights and heater only work when the 12v battery is connected... 110 electrical power outlets work when generator is plugged in as well as the inverter fan. But heater and inside lights are not effected by generator when plugged in..

You can understand my concern, since the 12v battery will not run the heater and lights for long. Why would the generator power the 110 outlets and not the lights and heater. This issue just popped up. We used the trailer last in April, and have owned it for 3 years with no issues.

Any help with ideas as to my issue would be amazing!

Thank you!!

Storm chaser Jay
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Old 09-17-2015, 06:29 PM   #2
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Check all your 12 volt fuses. Take them out and look closely then put them back in. If they are okay go to the heater and check wires and connections.. Last check the volts at the battery with the generator off and then running. Could be a diode in the gen or battery failure. Just some things to check
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Old 09-19-2015, 04:33 PM   #3
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Check all your 12 volt fuses. Take them out and look closely then put them back in. If they are okay go to the heater and check wires and connections.. Last check the volts at the battery with the generator off and then running. Could be a diode in the gen or battery failure. Just some things to check
First of all thanks so much for your help!! I Checked the fuses, none blown. I checked the connections on everything, all seems tight. I checked the battery and it's full and getting a charge from the generator.. It's bizarre, as generator to the 110 outlets run fine when the generator is on, the battery gets a charge from the generator, but the generator to 12V won't work, generator won't power lights or heater.. Thoughts?
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Old 09-19-2015, 06:31 PM   #4
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Are you removing the battery when trying to run the heater and lights on generator?

Strictly speaking the generator doesn't run the 12 volt stuff, the battery and converter does.

Which generator do you have?
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Old 09-19-2015, 07:52 PM   #5
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Bama Rambler is correct. The generator does not run the 12v stuff when connected. Your original post also makes me believe you are disconnecting the battery when plugging into the generator.

You don't need to do that. The battery has to stay connected to provide 12v and the converter will keep it charged when plugged in to 110v.
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Old 09-19-2015, 11:36 PM   #6
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When I disconnect the battery while the generator is running or not, it shuts the heater and lights off. 110 still works if generator is running. Generator is a 2000w Honda. I think my issue is within my inverter box..
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Old 09-20-2015, 08:12 AM   #7
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Some converters aren't designed to have the battery disconnected when on shore power (post or generator).

Did you actually test the fuses or just look at them? Sometimes they'll look ok and be bad.

The best way to test the converter is to test the voltage with the battery connected.

Fyi. It's a converter not an inverter.
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Old 09-20-2015, 02:23 PM   #8
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When checking the fuses, also check the fuse's continuity (ensure it is letting power through). A lot of fuse kits have a tester/puller in them. The reason I say this, is I have seen cheap foreign-made fuses, which look fine, but actually don't work. I learned this while working on my old Hoda VFR. Doing this has saved me a lot of extra work (once I figured it out).
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Old 09-20-2015, 03:04 PM   #9
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When I disconnect the battery while the generator is running or not, it shuts the heater and lights off. 110 still works if generator is running. Generator is a 2000w Honda. I think my issue is within my inverter box..
Hook the battery back up and try the heater. If it works then leave it in.

Depending on how your converter is wired it may not supply power to the heater if you disconnect the battery.

Jim
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Old 09-20-2015, 03:06 PM   #10
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When checking the fuses, also check the fuse's continuity (ensure it is letting power through). A lot of fuse kits have a tester/puller in them. The reason I say this, is I have seen cheap foreign-made fuses, which look fine, but actually don't work. I learned this while working on my old Hoda VFR. Doing this has saved me a lot of extra work (once I figured it out).
I never go by how a fuse looks. Always use a meter to check them.

Jim
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