Quote:
Originally Posted by bwright
I have been trying to find the source of my problem with the 12 volt power in my 2021 3761FL for a couple of months now. When the unit is connected to shore power, everything works. When I disconnect shore power, nothing works. I have troubleshooted the following items below:
1) Inverter is good when plugged in, starter wire is getting 12 volts
2) Converter is working properly and even talked with a tech at Progressive Dynamics to confirm I was checking all correctly
3) Battery is good and properly charged
3) The power key in the wet bay is in the right position and cannot be removed
4) Battery shut off in the front compartment is "ON"
When I disconnect shore power, I have no 12volt anywhere in the coach and the inverter is not running and powering the refrigerator.
What am I missing?
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When you disconnect from shore power the converter should be turned off otherwise you are chasing your tail. If the batteries are dealer installed or equivalent they are most likely dead. In order of goodness get two 6V GC batteries from Trojan or equivalent. 2 12V AGM DEEP cycle battery, one LiFePO4. With goodness comes initial cost but life also increases. A lot will depend on how long you boondock each year.
You can tell if your batteries are wrong by looking at them., If the initils CCA or MCCA or the phrase cranking amps is there than it's the wrong kind of battery. Ne informed, many sellers will sell you the wrong thing. I got mine at a golf cart store and they were the cheapest.