Welcome! Please use the navigational links to explore our website.
Company Logo (800) 853-2651 Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tractor Talk Discussion Forum

1 Wire Alternator

Welcome Guest, Log in or Register
Author  [Modern View]
super99

01-24-2023 14:44:45




Report to Moderator

Changing my 1850 from original 3 wire with regulator to a 1wire. Do I have to unhook the wires from the regulator or can I just leave them hooked up?

Third Party Image

Third Party Image

There was a ground bolt on the new alternator, so I hooked the old ground wire to it.

Third Party Image

My 1550 had a 1 wire on it when I got it. No regulator and the wires just hanging there. Not sure if I need to disconnect wires from unused regulator or just leave it alone. B Thanks,Chris

[Log in to Reply]   [No Email]
JMOR

01-26-2023 08:38:27




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to see

"Maybe that is it..."

" and no battery drain."

Many words could have been saved!



[Log in to Reply]  [No Email]
Janicholson

01-25-2023 20:55:37




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Rationale: not all one wires are the same. I have seen one wires that clearly pulled 1/2 amp when not turning (through the output to the battery). Those took 2000 rpm on the alt pulley to self start. I have seen some that were at 120ma draw and would take a long time to lower a battery so far that starting failed, maybe a month, depending on the battery size and condition. I recently put a 3 wire 10SI from O'reilly on a 56 IH Pickup. I started it up without the excite wire or sense wire attached to check the belt alignment and it charged immediately. I called the store and the manager said they sell only one in that amp size and sell it as either a one wire or 3 wire. I hooked up the dash warning light, and the sense wire and it worked as intended. so my take is that everybody is correct!!! Measure the draw. Jim

[Log in to Reply]  [No Email]
docmirror

01-25-2023 20:41:00




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Single wire alt: Will charge from idle because it has a voltage path to energize the field. A 3 wire will only charge from idle after the batt voltage exceeds to bias voltage in the regulator and energizes the field. That's why sometimes one needs to rev the engine slightly to get the regulator to engage on an ext regulated 3 wire alt.

Batt drain at rest. First - depends on how the 1 wire alt is wired into the tractor. If it is direct from the charge line to the plus of the battery yes there will be a very slight leakage current backward through the four rectifier diodes onboard the alt. I don't know what the leakage current is for those diodes but it is pretty small. Maybe 50 to 100 microamps? Just a guess.

If the 1 wire is routed through an ignition switch it will have a hot position and a start position. Some tractors only have off and hot. In that case there will be no leakage because when the ignition switch is off, there is no current path from the diodes on the alt to the batt + term.

The best way to do it is to wire the 1 wire alt lead to a 50 amp relay, and then to the plus term of the batt. Run the hot lead from the batt through the ign switch so it will pick or engage the relay AFTER the tractor starts. This requires a 3 pos ignition switch which does not lend itself to some tractor designs with a safety push switch to start.

3 wire alternators are suitable for conditions where there is a large amp draw that is far from the battery, and also far from the alternator. The sense wire on the alt is used to sense the voltage drop of the loads at the battery and adjust the output of the onboard regulator in the alternator to compensate for that voltage drop, and provide a hotter voltage AT the batt + term. In our case on most vintage tractors the elect loads are rarely large, and rarely far from the alt or batt, so the sense wire is not needed, and the default energy from the alt is enough to maintain the batt charge voltage without the distance sense circuit.
This post was edited by docmirror on 01/25/2023 at 08:41 pm.

[Log in to Reply]  [No Email]
JMOR

01-25-2023 14:35:11




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to seeI have measured many, both 3 wire and one wire and ALL have a parasitic drain. You very clearly have not measured or you would have knowledge of same. You would be able to tell me the drain current measured value. Can't do, can you?



[Log in to Reply]  [No Email]
Traditional Farmer

01-25-2023 14:45:20




Report to Moderator
 Re: 1 Wire Alternator in reply to JMOR, 01-25-2023 14:35:11  
All I need to know is mine won't run the battery down from Oct to May,must not be much of a drain.As you may have noticed some here say they don't some say they do,as with everything else all apparently not created equal.Have you actually run and used a tractor with a 1 wire alternator in the last 10 years?



[Log in to Reply]  [No Email]
Dieseltech

01-25-2023 17:27:08




Report to Moderator
 Re: 1 Wire Alternator in reply to Traditional Farmer, 01-25-2023 14:45:20  
I wonder if the later one wire systems have changed from the earlier regulators? I used two different test lights today between the bat ground cable and the negative post. My older test light showed no light glowing at all, which SHOULD mean no current draw down over time. My new Snap On EECT400R test light DID show a small current draw, and confirms why I remove the ground cable if tractor won't be used for awhile. The last three one wire alts I got since 2016, and I like how well they work.

[Log in to Reply]  [No Email]
Traditional Farmer

01-26-2023 04:16:57




Report to Moderator
 Re: 1 Wire Alternator in reply to Dieseltech, 01-25-2023 17:27:08  
Maybe that is it,most of mine are pretty new.I had a 1 wire on a Landini I bought it was an old alternator and it would run down the battery in a hurry.Also have seen some so called converted ones they don't work very well.Also I think maybe an electrical system will have some other draw on it and the alternator gets the blame.The DB 780 I bought with a tree across the fuel tank crushed it and the dash.Took everything off beat out the hood and put on a plastic fuel tank.Complete electrical system is the battery cables and a wire about 4ft long running from the Alt to the starter solenoid.(LOL)Great little raking tractor for the last 20+ years

[Log in to Reply]  [No Email]
JMOR

01-25-2023 09:24:24




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to see

Exactly! If he has the instruments & user knowledge he can measure the drain and verify what I said, i.e., the drain is there and he is just unaware of it. That is a fact & in no way calling him a liar.....those were his words, not mine.



[Log in to Reply]  [No Email]
Traditional Farmer

01-25-2023 13:07:28




Report to Moderator
 Re: 1 Wire Alternator in reply to JMOR, 01-25-2023 09:24:24  
So when did you check MY tractors? If you didn't you have NO idea.Come on by with your meter.



[Log in to Reply]  [No Email]
BarnyardEngineering

01-25-2023 07:25:36




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to see

Can't prove that it isn't there? Ever heard of an ammeter?



[Log in to Reply]  [No Email]
RobCons

01-25-2023 04:31:23




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
I vote for removal and cleaning up the wiring. One less thing to cause a problem down the road.



[Log in to Reply]  [No Email]
caterpillar guy

01-25-2023 02:27:33




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
I'm with Steve and Old it doen't matter for function just less to contend with later or cause problems. The battery wire could possibly be used from the regulator as long as it goes back to the amp gauge or volt meter and not through the old regulator same with the ground direct to ground.



[Log in to Reply]  [No Email]
JMOR

01-24-2023 20:15:03




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to seeyep



[Log in to Reply]  [No Email]
Dieseltech

01-24-2023 20:06:51




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
I have three tractors with the one wire Delco, all three charge right away after starting. All three have a very slight current draw with engine off, not a problem IF they only set unused up to two or three weeks. Any longer and the ground cable is pulled off or the ground disconnect is turned off. My 560D has two batteries, and one time it set in the shed unused for four months, batteries were completely dead as I forgot to turn off the ground switch. They charged back up OK, and I remember to use the switch now.

[Log in to Reply]  [No Email]
JMOR

01-24-2023 19:32:36




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to seeNo battery drain , in your mind, but it is there. You can not prove that it isn't. Does it matter to you....obviously not. But don't try to fool the rest of the world with false hoods!



[Log in to Reply]  [No Email]
Stuart

01-25-2023 04:58:20




Report to Moderator
 Re: 1 Wire Alternator in reply to JMOR, 01-24-2023 19:32:36  
And you cant prove that it is there.



[Log in to Reply]  [No Email]
Traditional Farmer

01-25-2023 00:31:47




Report to Moderator
 Re: 1 Wire Alternator in reply to JMOR, 01-24-2023 19:32:36  
I have a David Brown 780 with a 1 wire alternator it sits usually from Oct to May with the battery hooked up,it fires right up no problem to go rake hay.Really you should get some knowledge before calling me a liar,I'd love to for you to come by my place so I could school you on 1 wire alternators.



[Log in to Reply]  [No Email]
buickanddeere

01-24-2023 17:12:59




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Quoting Removed, click Modern View to see

Why on earth install a one wire in place of a three wire ? Battery drain . Needs high rpm to start charging .



[Log in to Reply]  [No Email]
Welding man

01-25-2023 05:06:34




Report to Moderator
 Re: 1 Wire Alternator in reply to buickanddeere, 01-24-2023 17:12:59  
Lots of reasons, especially if you are converting from a generator. We even build 6 volt positive ground alternators. Putting one together today. I have not had the problems you talk about. We love them.



[Log in to Reply]  [No Email]
Traditional Farmer

01-24-2023 18:04:17




Report to Moderator
 Re: 1 Wire Alternator in reply to buickanddeere, 01-24-2023 17:12:59  
I'm running about 10 1 wire alternators,they charge at start up and no battery drain.



[Log in to Reply]  [No Email]
grandpa Love

01-24-2023 17:50:08




Report to Moderator
 Re: 1 Wire Alternator in reply to buickanddeere, 01-24-2023 17:12:59  
I have a couple Cubs with Delco one wire alternators, they start start charging immediately, at an idle..... I always unhook the negative battery cable, when not using, in case mice chew up wires, short things out and start a fire, hence no battery drain.



[Log in to Reply]  [No Email]
Bob Harvey

01-24-2023 16:49:23




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
WHY ?



[Log in to Reply]  [No Email]
Steve@Advance

01-24-2023 15:35:35




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
Doesn't really matter as far as function.

It would look better is you took it off and clean up the wiring. One less thing to possibly ground out.



[Log in to Reply]  [No Email]
Janicholson

01-24-2023 17:43:41




Report to Moderator
 Re: 1 Wire Alternator in reply to Steve@Advance, 01-24-2023 15:35:35  
Agree with Steve and old! Jim



[Log in to Reply]  [No Email]
old

01-24-2023 15:03:41




Report to Moderator
 Re: 1 Wire Alternator in reply to super99, 01-24-2023 14:44:45  
If it where me I would take the regulator off



[Log in to Reply]  [No Email]
SidS

01-24-2023 18:10:31




Report to Moderator
 Re: 1 Wire Alternator in reply to old, 01-24-2023 15:03:41  
If you want to remove the 10dn the 10si is ok but don't use a one wire.



[Log in to Reply]  [No Email]
Fixingfarmer

01-25-2023 04:09:36




Report to Moderator
 Re: 1 Wire Alternator in reply to SidS, 01-24-2023 18:10:31  
Id wrap the other wires on the one your doing and the 1550 up with tape to protect them in case someone wants to put it back how it was. Not to mention there could be power there that could cause a spark if not unhooked farther back



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T ... [Read Article]

Latest Ad: John Deere 420 W 1956 with full hydraulic Superior loader.. power steering, direction reverser, touch o magic,3 point, Pto.. Great sheet metal. Runs no smoke. May be a original yellow from factory.Decent tires. [More Ads]

Copyright © 1997-2022 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy