Farm Equipment - polarize generator

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polarize generator

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=41743
Printed Date: 29 Aug 2025 at 12:21am
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Topic: polarize generator

Posted By: JOHN N/IL
Subject: polarize generator
Date Posted: 06 Dec 2011 at 7:24pm

I bought a new vr for a d17d 1958.I need to know if i have to repolarize the gen.If i do then i was told you can damage things if you do it wrong.It depends on what type of field grounding you have.Whatthe way to tell if you have an internal ground or external ground through the vr. Thanks for any insight,John

Replies:

Posted By: DougS
Date Posted: 06 Dec 2011 at 8:19pm

Polarizing a generator is no big deal. Momentarily touch a live wire from the battery to the A (armature) post on the generator. You need to repolarize a generator when you change your system from positive ground to negative ground. Otherwise it usually isn't necessary.

Posted By: Chalmersbob
Date Posted: 06 Dec 2011 at 9:50pm

The last VR that I purchased came with instructions on how to polarize the Genny.

I always just "flashed" the terminals. however the instructions sheet said to hold the wire on the terminal for several seconds. The one VR that I replaced 2 years ago didn't work after I flashed it. I talked to the dealer service tech and he said he has had them that required 2-3 flashes before they would work. I tred it again, several times, and it worked. Bob