I have a 318 that I am having charging issues with. I have researched the stator and voltage regulator on the internet. What I have is with engine running I have 39 volts AC on stator leads. Also when I check each stator lead to ground with engine off it shows a solid ground on both. How can the leads be grounded and still put out good AC. I thought I had voltage regulator problems and have purchased 2 new elcheapo ones and a used OEM one off of ebay. When I received all 3 of these I checked for continuity before installing them. All three have continuity between the DC spade and the right AC spade on the regulator laying on work bench. Is this normal? Is my stator bad since it shows both leads grounded even though it puts out AC voltage.
- Thread starter RPB KS
- Start date
I had to dig but this past post might be very helpful for testing explanation. You can check stator output and rectifier output. I am not sure about checking for grounding on the stator wires.
I would look for a blown fuse from the rectifier to the battery(solenoid?). Also check for broken wires. Make sure the charge is actually making it back to the battery thru the ammeter and ignition. Clean cables really well.
It is possible it is charging but when you turn it off, the stator is grounding out and draining the battery when the engine is off. Might need to clean stator as mentioned in link below.
A test for a drain would be to disconnect battery overnight and see if it will fire up the next day.
No charge issue
I would look for a blown fuse from the rectifier to the battery(solenoid?). Also check for broken wires. Make sure the charge is actually making it back to the battery thru the ammeter and ignition. Clean cables really well.
It is possible it is charging but when you turn it off, the stator is grounding out and draining the battery when the engine is off. Might need to clean stator as mentioned in link below.
A test for a drain would be to disconnect battery overnight and see if it will fire up the next day.
No charge issue
With eng running & stator leads disconnected from regulator,check between each stator lead & eng block/battery neg terminal,if you read ANY AC voltage between leads & block/battery then winding in stator grounded,many times depending on where winding is grounded AC voltage will be close to factory spec for stator but little/no AC amps will be produced by stator.
In addition if eng a P series onan and as rrobert said if you have a blown fuse,bad ign sw,an open connection between regulator output & battery pos(+) in wiring harness or a short in tractor wiring regulator has a auto shutdown mode to protect reg/alt stator from damage by internally disconnecting reg output from tractor wiring till problem located/repaired.
In addition if eng a P series onan and as rrobert said if you have a blown fuse,bad ign sw,an open connection between regulator output & battery pos(+) in wiring harness or a short in tractor wiring regulator has a auto shutdown mode to protect reg/alt stator from damage by internally disconnecting reg output from tractor wiring till problem located/repaired.
Similar threads
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.
Copyright © 1997-2024 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