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John Deere 110 Charging System

rectifier regulator not charging

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15 replies to this topic

#1 JDJim OFFLINE  

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Posted July 31, 2016 - 08:24 AM

I'm new here, thanks to anyone who can help.  I have owned my 1971 John Deere 110  serial number 255190M (engine K181S) for 33 years.  I am bringing it back to life after several years of no use, and I can't get the charging system working.  I am burning out rectifiers.  They work for 5 seconds when the tractor starts (as witnessed by the ammeter showing a proper charge), then they only put out 7 volts. (Ammeter drops to a slight discharge) I am getting 33.5 volts out of the stator (should be 28 to 32?).  My thoughts are 1) too much voltage out of the stator and this is bad?   Wiring harness short?  Bad ground somewhere?  Any help is appreciated...



#2 boyscout862 OFFLINE  

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Posted July 31, 2016 - 11:38 AM

Welcome to GTT. I don't have the answer to your questions but someone will be along to help. In the mean time, check for the Kohler Manual in our Manuals Section and read the "troubleshooting guide". You seem to be aware of the possible problems. The troubleshooting guide will help you sort it out. The local tractor shows will be starting back up in September. You may want to attend a couple if you are looking for parts.

We do not have JD Manuals because JD lawyers say we can't. Good Luck, Rick

Edited by boyscout862, July 31, 2016 - 11:42 AM.

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#3 stiemmy ONLINE  

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Posted July 31, 2016 - 02:54 PM

Clean connections are PARAMOUNT!

Once you are absolutely sure everything is clean, and connections/wires are good, then start troubleshooting.

Cheers;)
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#4 JDJim OFFLINE  

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Posted August 01, 2016 - 07:01 AM

Thanks Stiemmy, I'll go over them again.  I am checking with an ohm meter, and they all seem to look good.  Any chance I got two bad rectifiers back to back? Would bad connections fry the rectifier, or just prevent it from putting out the 13.5 volts?  Thanks again.



#5 DougT ONLINE  

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Posted August 01, 2016 - 07:16 AM

It has to make a good ground at its mounting points. Painted areas prevent that.


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#6 Trav1s ONLINE  

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Posted August 01, 2016 - 10:10 AM

It has to make a good ground at its mounting points. Painted areas prevent that.

 

I used star washers to get a good ground on my 120 after I rebuilt it.  


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#7 JDJim OFFLINE  

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Posted August 02, 2016 - 06:27 AM

Thanks everyone. The grounds all appear to be good as checked by a test meter for continuity, but I cleaned them up anyway. Still getting 7.5 volts out of the rectifier, so I'll purchase a 3rd one and see what happens.  Did I mention I have a new battery installed?  I'll report back...



#8 ford4wd08 OFFLINE  

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Posted August 02, 2016 - 10:47 AM

Thanks everyone. The grounds all appear to be good as checked by a test meter for continuity, but I cleaned them up anyway. Still getting 7.5 volts out of the rectifier, so I'll purchase a 3rd one and see what happens.  Did I mention I have a new battery installed?  I'll report back...

 

Where are you getting your rectifiers from? Used?


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#9 Trav1s ONLINE  

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Posted August 02, 2016 - 10:54 AM

Do you have a 10 Amp or 15 amp system?  got a serial number on the tractor?  I can check my manual for ideas.



#10 JDJim OFFLINE  

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Posted August 04, 2016 - 01:08 PM

I am getting the rectifiers from eBay, new, at $25 - $35 apiece.   15 amp.  Serial number 255190M.  I have a couple  of manuals, and have gone through a few of the trouble shooting tests - Stator output, etc.   Appreciate any ideas, thanks much



#11 Trav1s ONLINE  

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Posted August 04, 2016 - 01:39 PM

Ok, found a pic of the system of JDParts

 

The Deere part number you need is AM34733 but some searching says it has been replaced with AM34734

 

Deere wiring harness is AM33220  Are you sure the wiring harness is good? 

 

 

I went round and round with a charging problem on my 1971 120.  Eventually replaced the wiring harness to resolve the problems.  I checked continuity and did every other test possible and it came out good every time.  I purchased it from http://www.wiringharnesses.com 

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Edited by Trav1s, August 04, 2016 - 02:21 PM.


#12 ford4wd08 OFFLINE  

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Posted August 04, 2016 - 03:23 PM

I am getting the rectifiers from eBay, new, at $25 - $35 apiece. 15 amp. Serial number 255190M. I have a couple of manuals, and have gone through a few of the trouble shooting tests - Stator output, etc. Appreciate any ideas, thanks much


I just bought a 15 amp for my 110 from Hapco Parts. Smaller than the original busted unit I had, but fits the mounting holes. It was about 90 bucks shipped to my door. That fixed my problem on my tractor.

#13 JDJim OFFLINE  

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Posted August 06, 2016 - 08:41 AM

Trav1s - Appreciate the help.  AM34733 has the wrong terminal setup and does not match the existing connector.  I am using part number AM37200 (AM33845) - The terminals are not all in a line and this matches the existing connector.  I tried a third $25 rectifier, same problem.  So now I (still) have a new battery, new rectifier, a stator that puts out 33.5 AC volts, and the rectifier is still outputting 7.5 volts   Can't find a short in the wiring (via continuity tests) so I am starting to think it is the wiring harness when put under working conditions.  Then  again, maybe I should just spend $90 and get the rectifier ford4wd08 got?!   How hard/long is it to replace the harness?


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#14 Trav1s ONLINE  

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Posted August 06, 2016 - 02:44 PM

The harness was really easy on my 120 and from what I know from my '68 110 it would be just as easy for you.  Is the harness still available from Deere? On some more common models it still is.  

 

 

Thinking more about your last post makes me wonder if that is even the correct harness for that tractor.


Edited by Trav1s, August 06, 2016 - 02:44 PM.


#15 JDJim OFFLINE  

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Posted August 06, 2016 - 08:27 PM

I'll call the harness folks (wiringharnesses.com) and have a chat with them about the correct harness. I have owned this tractor for 33 years, I suspect the harness is original. The connector configuration on the rectifier is correct for the 15 amp Kohler. Do I need to pull the flywheel to get to the stator connectors? 







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