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Oliver 550 electrical

1139 Views 3 Replies 3 Participants Last post by  Maine Dave
Would like to know the procedure for changing a 12 volt negative ground to a 12 volt positive ground on a Oliver 550 tractor. I have a new negative cluster gauge but am unable to purchase a positive one. At this point this seems to be an option to switch grounds.
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Good Morning marymays448, welcome to the forum.

All that you need to do is reverse the battery cables (positive cable from the battery is now ground... the negative cable from the battery goes to the starter), then reverse the wires on the amp gauge, and switch wires on the coil input.
After converting our 550 to negative ground the battery was draining. We found that the source was the ignition switch. The solution was to insulate the ignition switch from the body.
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