Like Danny said, most likely the battery. If you let it set uncharged, in the cold the battery may be damaged beyond just filling with distilled water. I'd suggest removing the battery and have it load tested by a competent person. If the battery has a shorted cell it can damage the converter.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
|