OC4 Electrical System

[W Roger Parry]

Which electrical grounding system does a late model OC4 have Positive or Negative?  It has a 6 Volt electrical system.

W. Roger Parry

[John Schwiebert]

By late model I would guess 3 cylinder model? Double check but it should have a Delco regulator and you should find the letters POS  stamped on the attaching band. This indicates Positive ground. More generator equipped tractors were positive ground than negative ground. More questions?

[W Roger Parry]

John, I changed the ground to positive and everything is OK.  Thanks for your help.

Roger