TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

Ford 9N, 2N & 8N Discussion Forum

High ammeter reading? Delco 12SI

Welcome Guest, Log in or Register

Author

Ken S.

02-16-2006 16:22:22

Report to Moderator

My 12V conversion worked perfect for two months till today while I was grading, I noticed the ammeter was reading almost 30! The battery is new and charged so something ain"t right. Doe"s that sound like alternator problem? I"m not familiar with an ammeter. Any thoughts?

[Log in to Reply] [No Email]

Ken S.

02-17-2006 11:28:18

Report to Moderator

Re: High ammeter reading? Delco 12SI in reply to Ken S., 02-16-2006 16:22:22

Thanks guys, I took the alt. to get it tested. It tripped the breaker on the test machine. LOL

[Log in to Reply] [No Email]

Bob

02-16-2006 22:48:56

Report to Moderator

Re: High ammeter reading? Delco 12SI in reply to Ken S., 02-16-2006 16:22:22

You need to check the charging voltage at the battery.

Obviously, a defective regulator in the alternator can make it overcharge.

Also, a battery with a shorted cell will not come up to proper voltage, and the alternator will appear to be overcharging, if you look at the ammeter.

Check the voltage at the battery, if it's much over 14.5 Volts, the regulator is not doing it's job. As the others have said, be sure there is a good connection to the regulators voltage sense (#2) terminal.

If the voltage at the battery is not excessive, but the high charging rate continues, it would point to a bad battery.

[Log in to Reply] [No Email]

02-16-2006 16:41:58

Report to Moderator

Re: High ammeter reading? Delco 12SI in reply to Ken S., 02-16-2006 16:22:22

I would look for a problem with the reference (I think P2) line.. In most simple conversions this will be connected directly to the BAT terminal (connected to the battery) but can go to any number of reference locations. If it is loose or shorted, it will affect the output of the alternator..J2

[Log in to Reply] [No Email]

MikeT

02-16-2006 16:36:54

Report to Moderator

Re: High ammeter reading? Delco 12SI in reply to Ken S., 02-16-2006 16:22:22

Ken -

Doesn't sound like the alternator is self regulating.

1st, check P2 on the alternator to make sure it's connected to the BAT post on the alternator. That is where it gets its voltage for the internal regulator circuit.

2nd, check the voltage at the battery posts and report back the value back here.

3rd, after running a while does the BAT wire coming off the alternator feel warm or hot?

4th, do you have an ampmeter with two posts or one with a coil of wire on the back?

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

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

Copyright © 1997-2023 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