Farm Equipment - 49 wd charging or not

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49 wd charging or not

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=18749
Printed Date: 07 Feb 2025 at 9:00am
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Topic: 49 wd charging or not

Posted By: briangroc
Subject: 49 wd charging or not
Date Posted: 26 Sep 2010 at 3:02pm

ok 49 wd wired up per dueys diagram. negative ground (i think, thats how it was when i got the tractor but im not sure if it ever really was working that way). . not sure how to tell either.
it has a mag, not a dist.
when i run tractor, ammeter pegs to negative side of ammeter.
i reversed the wiring on the ammeter, and it read nothing

lights dont work. but key turns off tractor now.
not worried about the lights im just tired of jump starting the tractor.
your guys knowledge would be very much appreciated.

thanks , brian

Replies:

Posted By: CTuckerNWIL
Date Posted: 26 Sep 2010 at 7:01pm

What are you using a generator or alternator? If genny is it 6 volt with cut out relay or do you have a regulator? If you crossed the ground hook up from what it was( with generator) you may have let the smoke out of the genny.

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: briangroc
Date Posted: 26 Sep 2010 at 10:26pm

alternator with internal regulator, if i have it hooked up backward could it still be charging but read negative?

Posted By: steve(ill)
Date Posted: 26 Sep 2010 at 10:31pm

if you connect an alternator up backward (+ ground), it will blow out the regulator and no longer work... You need a negative ground on almost all alternators. If the amp gauge reads backward, you reverse the leads on the gauge... but alternator big terminal is + and battery negative is ground.

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Like them all, but love the "B"s.

Posted By: CTuckerNWIL
Date Posted: 26 Sep 2010 at 10:38pm

The amp meter was originally set up for positive ground so with a neg ground alternator it would read backwards. My WD45 has been that way since I put the alternator on it 10 or so years ago. If you wired it backwards and the amp meter had already been switched the alternator may be smoked.
Check voltage at you battery with the engine off, and then with it running. You should have 12 not running and at least 13.5 running.

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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: Coke-in-MN
Date Posted: 26 Sep 2010 at 10:39pm

If you have a 10SI alternator , there is a hole on the back (looks like a upside-down U) mouse hole .. just inside the alt is a tab that sticks up off regulator board. If you use a small metal probe or a screw driver to ground that tab against alternator case it grounds regulator to full output.

If everything else is working, (brushes and diode trio ) you should get full output.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: briangroc
Date Posted: 28 Sep 2010 at 2:13am

i have the part numbers duey has on his site., i have a mag. battery is negative ground. so i am assuming ammeter reading negative would be charging? I think...

guys thanks for all your input, much appreciated.