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Onan twin CCK not charging

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=206608
Printed Date: 08 May 2025 at 8:48am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: Onan twin CCK not charging
Posted By: Heliarc
Subject: Onan twin CCK not charging
Date Posted: 06 May 2025 at 1:08pm
Working with an AC 720. It has an Onan CCK engine. It's only putting out about 5.5VDC. Is this the alternator/generator done for or should I be looking elsewhere?


Replies:
Posted By: den/southern illinoi
Date Posted: 06 May 2025 at 2:51pm
I do not know the answer to your question but was told where you can get new stators for these engines if it comes to that.  If so, message me and I will get you the info.

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Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.

Posted By: Heliarc
Date Posted: 07 May 2025 at 6:31am
Understood. Looks like if I want to do the stator, ring with coils?? I'd be pulling the engine. Trying to start cheap and easy before I do all that.

Posted By: steve(ill)
Date Posted: 07 May 2025 at 7:29pm
does yours have a 3 wire regulator on the stator output ?

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The first thing to do is to check the charging fuse and make sure it is not blown.

If the fuse is good, locate the voltage regulator on the engine, near the starter. It is a small aluminum box with 3 terminals on it.
The 2 outside terminals are the AC input.
The center terminal is the DC output.

Use your meter to test for battery voltage at the center terminal. It should read about 12V.
If it does not, either the fuse is blown, or the wire is broken.

If it reads battery voltage, set your meter to ACV, and connect one lead to each of the outer terminals.
Start the engine, and run it to full throttle. You should read between 40 and 60 VAC.
If it does not, the stator is bad.

If you have good AC voltage going in to the regulator, set your meter back to DCV. Retest the center terminal for DCV. With the engine running full throttle, it should read 13.6 - 14.7 VDC.
If you have good AC voltage going in to the regulator, but no DC voltage coming out, the regulator is bad.


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


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