Farm Equipment - Positive ground battery

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Positive ground battery

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=190740
Printed Date: 12 Aug 2025 at 7:43am
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Topic: Positive ground battery

Posted By: Travis2766
Subject: Positive ground battery
Date Posted: 17 Sep 2022 at 5:43pm

When replacing a positive ground battery in a positive ground system (d15 12 volt) can I just buy a new battery and hook it up with the positive to the ground or is there anything I need to do to the battery first? My FIL thought I may need to drain it down to zero amps and reverse the polarity when I recharge it but he couldn’t remember if that was right or not. Just don’t want to have it blow up in my face!

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190XT Series III, D17 Series IV, D15 Series II, All Crop 66 and a whole mess of equipment.

Replies:

Posted By: acd17toy
Date Posted: 17 Sep 2022 at 6:22pm

The battery does not care what the ground is, just install with the correct ground for the electrical system.

Posted By: steve(ill)
Date Posted: 17 Sep 2022 at 6:28pm

if you are going to use a charger, then connect POSITIVE to POSITIVE and NEG to NEG.. as AC said, the battery really dont care which side is grounded.

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

Posted By: JC-WI
Date Posted: 17 Sep 2022 at 10:12pm

If the tractor was positive ground, then connect the positive to the ground. If the tractor was negative ground, then connect negative to the ground.

If the tractor has been originally a positive ground and had an alternator put on, then it is most likely a negative ground system.

Never reverse charge a battery.

On new to you tractors always verify what polarity the electrical system is. Check to see if alternator, then most likely it is 12 volt negative... (unless alternator is stamped positive ground). If tractor has been changed from 6-12 volt positive ground to alternator and the amp gauge show discharge after it starts and returns to 0 after a few moments, then the wires were not changed on ammeter posts from pos. ground to neg ground system. One of our tractors was marked with a sharpie + l - right on the dash panel instead of changing the wires. That was corrected pretty fast as was the ignition coil.

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He who says there is no evil has already deceived himself
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