Farm Equipment - GM 1 wire alternator on WD

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GM 1 wire alternator on WD

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=8871
Printed Date: 16 Jun 2024 at 9:41pm
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Topic: GM 1 wire alternator on WD

Posted By: Branden(N-IL)
Subject: GM 1 wire alternator on WD
Date Posted: 02 Mar 2010 at 5:41pm

I recently put a GM 1 wire alternator on my WD. For some reason it won't start charging unless the tractor revs up past full throttle. What needs to be done so that the alternator will charge as soon as it starts up?

Thanks

Replies:

Posted By: Steve in NJ
Date Posted: 02 Mar 2010 at 5:52pm

Change it over to a three wire. Most 1 wire Alternators need 1200-1400 rpms to excite the regulator to start the charging process. One wire Alts are not for Tractors. Depending on what regulator that was installed in the unit when built, some can be used both ways. I offer a wiring kit to change a one wire to a three wire system which includes a key switch. Or, if you want to change it over yourself give me a call, be happy to help ya out....
Steve@B&B

Posted By: Dave(inMA)
Date Posted: 02 Mar 2010 at 5:53pm

My understanding of the 1-wire alternators is that they get their "tickle" current internally and that this requires a fairly high revolution speed. Could put a smaller pulley on the alternator or change out to a traditional 3-wire set-up. My D14 behaves similarly but doesn't require revving to as high a rate as yours seems to. Some of the experts on here may be able to suggest some way to tweak the alternator to bring down the required speed.

Looks like Steve (the expert) and I were posting at the same time! What he said....though my 1-wire set-up works okay!

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WC, CA, D14, WD45

Posted By: 190XTLP
Date Posted: 02 Mar 2010 at 8:33pm

super simple cheap fix for you

go to your auto store and buy the exciter wire/diode,and plug it in to the 2 prong

outlet(it is rubber caped)on your alt

hook remaining wire to any switched wire,about 10.00 will work perfect

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WD45G,WD45D.190XTD,190XTLP

D19LP,WC unstyled,WF unstyled

WC styled,220