Alternator Wireing Forum › Forums › Tractor Operation And Maintenance › Alternator Wireing This topic has 1 reply, 2 voices, and was last updated 13 years, 9 months ago by Bert. Viewing 1 reply thread Author Posts February 23, 2011 at 12:04 pm #30166 wilffParticipant Offline Hey Guys, Nice new site.. too bad the old posts aren't up yet… I have my alternator out right now, its an externally regulated one, its OEM, need to get it repaired.. My question is it has 4 wires.. what do they all do? which ones supply the output voltage, which one is the signal wire, and which is the feild wire? Thanks! February 23, 2011 at 12:33 pm #31270 BertParticipant Offline Here's a good document for your review. http://www.victronenergy.com/u…..erence.pdf Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In