Farm Equipment

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+ or -

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=18524
Printed Date: 30 Oct 2025 at 7:04pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: + or -

Posted By: DanNESD
Subject: + or -
Date Posted: 20 Sep 2010 at 10:08pm

Is a series II D17 diesel supposed to be positive or negative ground? I have the factory generator.

Replies:

Posted By: DSeries4
Date Posted: 20 Sep 2010 at 10:20pm

All D17s were positive ground. I changed mine to negative though.

Posted By: DanNESD
Date Posted: 20 Sep 2010 at 10:28pm

What do you have to do to change it over? Or did you put an alternator on it?

Posted By: DonDittmar
Date Posted: 21 Sep 2010 at 7:49am

Change wires on coil around. Hot wire from IGN switch to + on coil. From - on coil to DIST stud. Change battery cables to NEG ground. Then repolarize regulator by taking a short wire and jumping BAT to GEN. This is assuming you have kept the factory generator and not switch over to alternator. If you do switch it over to alternator you still do all of the stuff listed with the exception of repolarizing the voltage regulator.

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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"

1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start

Posted By: DSeries4
Date Posted: 21 Sep 2010 at 10:35pm

Do as Don said, plus switch the wires on the ammeter guage. I kept the generator on mine, just wanted it consistent for boosting other vehicles.

Posted By: DanNESD
Date Posted: 21 Sep 2010 at 10:39pm

Thanks for the tips, I want to do like DSeries 4 did. Have it the same as everything else.