200 Alternator
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=194041
Printed Date: 25 Aug 2025 at 8:11pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 200 Alternator
Posted By: Ky.Allis
Subject: 200 Alternator
Date Posted: 13 Mar 2023 at 1:04pm
| I think my 200 may have alternator and/or regulator issues. Is there a way to test the alternator while on the tractor? This is the original set up with tach drive on back of alternator and regulator under the cover of the instrument cluster. Alternator and regulator have not been touched for 15 years and have worked perfectly. Starting this morning, with heater fan on, the needle on amp meter is slightly left of vertical and with headlights on, even farther to the left. Thanks for any help!!! |
Replies:
Posted By: WF owner
Date Posted: 13 Mar 2023 at 2:15pm
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Have you tried using a voltmeter on the battery while running? If it's not charging, check the easy things first. Check all the connections on the alternator and the regulator, including (actually especially!) the ground.
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Posted By: DrAllis
Date Posted: 13 Mar 2023 at 2:32pm
| Jumper wire from the HOT terminal on the alternator to the wire inside the small square plug while the engine is running. This puts the alt at 100% charge. If that doesn't get the ammeter back in the plus side, the alternator is weak and has problems. If it goes into the plus side well, you prob need a regulator. |
Posted By: darrel in ND
Date Posted: 13 Mar 2023 at 4:01pm
I wish that I could lock that piece of information into my memory bank for future reference! Darrel |
DrAllis wrote:Posted By: Steve in NJ
Date Posted: 13 Mar 2023 at 5:17pm
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If you been having cold, wet weather, make sure the VR is grounded correctly. Might be starting to lose the ground. Clean the Battery posts as well. Might be losing the connection at one of the terminals. Do the easy stuff first. If it's been fine all along and all of a sudden it started having issues, it's probably something dumb.... Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: PaulB
Date Posted: 14 Mar 2023 at 5:59am
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Might not be nothing more than a loose or old belt. Older belts don't do as good as you might think, even when they look OK.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: Justin Widlund (IA)
Date Posted: 14 Mar 2023 at 8:26am
Agreed. This is "knowledge base" material
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Posted By: Ky.Allis
Date Posted: 14 Mar 2023 at 9:52am
| Dr. Allis, when you say "HOT" terminal, I assume you are referring to the larger orange wire? The dual belts are tight and terminals look good. Going to get it in the shop in a few days and check battery connections. Replaced batteries 3 yrs. ago and have not checked them since. With the cab, checking the batteries is much more of a job than open station tractor. Thanks everyone for the help!!!! |
Posted By: Les Kerf
Date Posted: 14 Mar 2023 at 10:06am
I have had that happen too; a belt that was properly tensioned and you would swear it should work, but still slipped (silently). Being inherently lazy, I always do the easy stuff first before chasing obscure connections, etc. Tighten belt if needed. Connect voltmeter Full-field the alternator as mentioned above by the good Doctor, this will tell you which direction pursue. Good luck!  |
Posted By: DrAllis
Date Posted: 14 Mar 2023 at 10:06am
| Hot terminal is the big orange wire. |
Posted By: Ky.Allis
Date Posted: 19 Mar 2023 at 5:19pm
| Well, as usual, Dr. A was right again. Did the "jumper wire" test and amp meter did not move at all. Took alternator to a shop and it's output was zero. Should get it back in a couple of days. Thanks to all who replied. |
Posted By: rick ky
Date Posted: 19 Mar 2023 at 6:14pm
| where are you sending your alternators to be repaired? the lexington, georgetown, frankfort and danville area does not have a repair shop anymore. looking for a new shop to take starters, generators and alternators to be repaired. |
Posted By: Steve in NJ
Date Posted: 19 Mar 2023 at 6:26pm
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We offer Starter, Alternator, Gennie repairs and conversions if interested. Coarse, you would have to ship em', but using the USPS Flat rate system, keeps the shipping costs down... Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: Ky.Allis
Date Posted: 19 Mar 2023 at 11:11pm
| The shop that was in Danville (Drakeford Bros.) is gone, But one of the guys, maybe a brother?, started a small shop of his own in Stanford. It's out in the country a bit. Just a small shop behind his house, but it's nice and looks like he definitely knows what he's doing. Goes by Drakeford Rebuilders. 859 238 7665 |
Posted By: ac-mike
Date Posted: 20 Mar 2023 at 7:50am
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There is a good shop in Leabon Ky. Tri-county, always had good service ------------- D-12III, 200D, 170G, HD-3, D19D 3pt, D17D High Crop, WD45G p/s, D15IID, D15IIG, D15G IND, 655, (3)WD45D p/s, 700, 816 |