Classifieds - Positive or negative ground

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Positive or negative ground

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Classifieds
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=193514
Printed Date: 27 Sep 2024 at 12:23pm
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Topic: Positive or negative ground

Posted By: uldmoore2009
Subject: Positive or negative ground
Date Posted: 14 Feb 2023 at 3:58pm

How do I know if my tractor is setup for a positive or negative ground ? I was trying to get it going and replaced the solenoid tried to get it to start a couple of times and my solenoid is appears to be fried

Replies:

Posted By: steve(ill)
Date Posted: 14 Feb 2023 at 4:33pm

what is the tractor model ??? Most really dont care if they are connected positive or negative, as long as you dont short out the wires..... and you should move to the TRACTOR section, not the CLASSIFIED...

look at the STARTER cable and follow it backward.. Should go to the SOLENOID, then other side of SOLENOID goes to the battery... WHICH TERMINAL ?

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Like them all, but love the "B"s.

Posted By: uldmoore2009
Date Posted: 14 Feb 2023 at 5:02pm

Allis chalmers d17 series 1 if I follow the wire it goes to the solenoid but the problem is this tractor didn't have a battery on it when I got it

Posted By: DrAllis
Date Posted: 14 Feb 2023 at 6:24pm

ALL A-C tractors with a generator are POSITIVE ground. Makes no difference 6 or 12 volts. ALL A-C tractors with an alternator are NEGATIVE ground. ALL A-C tractors converted from a gen to an alt are still negative ground.

Posted By: steve(ill)
Date Posted: 14 Feb 2023 at 6:33pm

as Dr said, your tractor originally had a generator and it would have been positive ground.. The generator is the charging system and would normally be painted BLACK... If you have an ALTERNATOR,, it was converted to negative ground , 12 volts... The ALTERNATOR would normally be aluminum and not painted...

Again, the tractor does not care ( starter and solenoid), and will start with either ground... But you generator or alternator might not like it.

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Like them all, but love the "B"s.