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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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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