Farm Equipment - voltage regulator problem in alternator

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voltage regulator problem in alternator

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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=138790
Printed Date: 01 Sep 2025 at 8:08am
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Topic: voltage regulator problem in alternator

Posted By: nella(Pa)
Subject: voltage regulator problem in alternator
Date Posted: 26 May 2017 at 5:46am

My neighbor has a Ford 8240 and two alternators went bad. Is there anything in the tractor that could be causing the alternator to to stop charging? I think it is taking out the voltage regulator inside the alternator. Checked the batteries and they are good.

Thanks, Nella

Replies:

Posted By: jaybmiller
Date Posted: 26 May 2017 at 5:57am

Without seeing it in person, my 'hunch' is that there's an intermittent dead short.
Could be in the wiring harness( mice are famous for chewing on wires),
maybe a wire is grounding out due to rubbing on steel,
could be the ammeter grounding out( fibre insulators are gone),
bad battery(though you say good..does it work in something else?)

What usually takes out VRs is very high current 'spikes'( short term < 1 second).Something human eyeballs can't see on meters but solidstate device do!

Jay

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water