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crossed wires

A

Anonymous-0

Well-known Member
tried to jump start a JDeere D 1947(has electric start and a magneto-type ignition)which has a positive to ground system.akenly reversed the wires and got a "lot" of smoke and sparks(and a small flame on the good battery which burned a small hole thru the top of the battery case. Now the tractor won't start even with a good battery hooked to it. What have I damaged? Anyone there can help me? And please, i no this was thoughtless etc. Thanks
 
mag has no effect on battery ignition after wires are on properly when motor in turned over (clockwise on right side of tractor facing belt pulley) motor should start properly. crossed wires generly has no perment effect
 
Sounds to me like you had a short to the top of the battery case. Positive and negative terminals are different sizes. If you put the smaller cable end on the larger terminal, it wouldn't go down very far. Suspect it stuck up far enough to contact the battery case.

Starter won't care if you reversed polarity. In order to get smoke & flames, you had to have a high current short.

If you did short one of the cable terminals to the battery case, you may have melted enough of it that it either isn't making good contact to the battery or there isn't enough metal left to carry the starting current.

Keith
 
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