Id "guess" it may not actually be negative/reverse voltage but just a drastic drop ??? If voltage drops drastic when a load is applied there must be a bad/loose/resistive connection from the source to that receptacle/outlet causing a V = I x R voltage drop you see in your meter etc HOWEVER a volt meter is an extremely high resistance low current draw which shouldn't cause such a high V = I x R drop in the supply circuit. The receptacle/outlet other terminals use the same ground so if its ONLY one terminal exhibiting that it don't sound like a ground problem, but hey still a bad ground can cause all sorts of weird problems????????
Still to be safe Id try a new direct dedicated circuit from the receptacle ground terminal up to the battery - and see what happens.
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