Noticeable Buzzing from Power Inverter When Plugged in to Shore Power
Hello all, I'm having a strange issue with a new-to-me fifth wheel. When I purchased it, the batteries were completely dead. When we plugged it into shore power, none of the 12v accessories would work. I did some digging and found the power inverter wasn't plugged into its outlet under the coach, so I plugged that in and heard a fairly loud buzzing. I thought it was because there were no batteries, so I dismissed it initially.
Fast forward a couple of months to the point that we are starting to work on the RV to get it ready to use. I get batteries in it, and everything is good, except when we plug it into shore power with the power inverter plugged in. It's not that it isn't working, it is just buzzing like the dickens; very noticeable inside of the coach even. I don't know if this is related, but the microwave doesn't come on unless the coach is plugged into shore power, the generator doesn't power it on.
This sounds to me like the inverter is bad, but I wanted to see if there was something else I might be missing. Thanks!
EDIT: After doing a little digging on a replacement, this might be a converter instead of an inverter. I'll try and pull the unit out (only has a thick red, black, and the power cord) and get some info from it. If this is the case, would that only convert from 120v to 12v, or does it work the other way around as well?
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