Minneapolis Moline 5 Star LPG

A Grape 1 · Feb 25, 2015

I just purchased my first MM. It is a 1957 LPG with the adjustable wide front-end. I have some manuals ordered, but hope to get it running this weekend. There is no ignition and no battery. Is this tractor a negative ground machine? I can handle getting an ignition wire, but need help on the ground.

larry Mi · Feb 25, 2015

All MM with a generator were + positive ground.

A Grape 1 · Feb 25, 2015

Thank you for the reply Larry. The tractor has an alternator with a Motorola Electronic Regulator. At least that is what is on it now.

larry Mi · Feb 25, 2015

If it has an alt. then they were all - negative ground.

shinnery · Feb 26, 2015

My '65 M670 currently has an alternator and is hooked up as negative ground but the ammeter reads backwards. I am the only one that drives it and I know about the problem, but it is kinda funny to look at.
Bryce

Ill John · Feb 26, 2015

Take a lookat the coil If the + side goes to the distributor it was + ground if the _ side goes to the dist it was negative ground

A Grape 1 · Feb 26, 2015

Thanks Ill John. The + side of the coil does go to the distributor. I just got the operators manual in the mail and the wiring schematic has the + terminal of the battery going to ground.

MMDEL · Feb 27, 2015

If it has been switched to an alt. It would be negative grd. And they probably didn't know enough to switch the coil.
MMDEL

Minneapolis Moline 5 Star LPG

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