Did I fry my 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=197311
Printed Date: 25 Sep 2024 at 5:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Did I fry my alternator??
Posted By: ranger43
Subject: Did I fry my alternator??
Date Posted: 21 Sep 2023 at 7:46pm
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So we went through the entire cooling system on our 210. We ran it for a bit without the hood on to check for leaks. So didn't have the voltage regulator hooked up. So tonight we put the hood back on, hooked up regulator and.... no charging at the ammeter gauge. Gauge shows discharge with lights on. I have a fresh rebuilt one to go on tomorrow, but curious if that led to a premature failure ?? Tractor charged great prior to tear down.
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Replies:
Posted By: AC720Man
Date Posted: 21 Sep 2023 at 7:54pm
I would double check your wiring to make sure they are connected in the correct positions and making good contact. The other possibility is that the VR has lost it’s ground somewhere. I had the same issue and it was a grounding issue. Clean all contact points, if your wiring is correct I would put money on it that it’s a high resistant grounding issue. The VR has at least one foot that is used for ground. You will see a wire strap going to the mounting leg. If you removed sheet metal there could be a loose or missing bolt that completed the ground.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: ranger43
Date Posted: 21 Sep 2023 at 7:58pm
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Thanks, that ground on the VR may be the problem.
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Posted By: AC720Man
Date Posted: 21 Sep 2023 at 8:03pm
I updated my post with some more info.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: Les Kerf
Date Posted: 22 Sep 2023 at 9:51am
With no field current the alternator then becomes an idler pulley; it is highly unlikely to cause any damage.
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Posted By: Steve in NJ
Date Posted: 22 Sep 2023 at 5:52pm
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Nah. Alt is probably okay. Wouldn't hurt to have it checked though just to make sure it's operating as it should. Most shops can throw it on an 881 machine or similar and run some load tests to check proper output. Only takes a few minutes and most shops won't even charge ya... Well, at least I don't. LOL!
Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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