Farm Equipment - d19 charging system

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d19 charging system

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=51554
Printed Date: 24 Aug 2025 at 10:28am
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Topic: d19 charging system

Posted By: Bolivar Boy
Subject: d19 charging system
Date Posted: 04 Jun 2012 at 9:22am

had generator rebuilt this spring due to low output and bearing failure. rebuilt unit put out a very accomidating 20 amps plus. finished field work. miminal amp output. measure voltage @ run from battery @ 10.8 to 11.1 volts. at generator, same. lights on, same. suspect faulty rebuild. would like directions on test measuring voltage regulator for performance. 3 wire assy. thankyou in advance.....bolivar boy.

Replies:

Posted By: DonDittmar
Date Posted: 04 Jun 2012 at 9:51am

You should have BAT volatge at the BAT terminal on the VR. If so the next thing to do is jump the F terminal on the gen to ground. This should make the GEN go to full field and charge 100%. If it does you have a VR/wiring problem. If it doesnt then you have a gen problem

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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: Brian Jasper co. Ia
Date Posted: 04 Jun 2012 at 12:35pm

After you short the F to ground and if it still doesn't work, pull the belt off, disconnect the F wire from the gen, and apply battery voltage to the A terminal. The gen should spin fast like a motor. While motoring, ground the F terminal. It should slow down but continue to motor. If it passes these tests, load test your wires. If they all pass, your regulator is faulty.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: Bolivar Boy
Date Posted: 04 Jun 2012 at 2:12pm

thankyou fellows. just what i was looking for........best regards. tp studer.