Has there been a result on this problem as yet? I was thinking of all that load on the 12volt system could there be a shortage of power or are the wires heavy enough (16 gage versa. 8 gage wire). Is this truck a 18 wheeler gasoline/propane? Some big trucks use 18 volt and some are feed from the positive side and not the negative. I really want to know the answer to correct this problem if passable.