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1978 Southwind M/H. While servicing the batteries, I accidently hooked up the house battery backwards. OOOps. Now my 4000watt onan generator will not deliver electricty. I checked with my meter, and have 125 volts at the gen. fuse box, but non at the convertor, or 120 volt outlets. All the 12volt fuses in convertor are good. Have I blown up the convertor? How do I diagnose this problem. Your help is much appriciated Jerry.