I just purchased a 2019 Thor Windsport 29M and it has a WF-5110R 1000W Inverter that is not working. Today I chased the issue down to a lack of 12 V at the input of the inverter. I found that the black/negative wire to the inverter goes under the cab and then is just dangling there, not attached to anything. Yikes.
My question is does the negative cable NEED to go back to the battery negative terminal or can it be grounded right to the chassis? The Thor diagram below shows it goes back to the negative terminal, but is that necessary? Does not grounding it to the chassis frame achieve the same thing?
Thank you!