WD Allis Light switch resistor

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Just got a replacement three position light switch for the WD Allis.  I am still using the original 6 volt generator with a cutout.  How many ohms should the light switch resistor on a WD measure?  I thought it would be 2 ohms because you want about a 3 amp charge.  The new one measures .5 ohms. 
I have had this tractor for 18 years and finally decided to fix the switch.  Used it all these years just pulling out the switch for high charge for about 30 minutes each time I used it since it did not charge with the switch all the way in.  When I opened up the console the original resistor was missing and the wiring was 'interesting'.

	This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
	The Forum	Parts and Services	Unofficial Allis Store	Tractor Shows	Serial Numbers	History

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
1951WDNWWI Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Access Joined: 11 Jul 2011 Location: NW Wisconsin Points: 116	Post Options Post Reply Quote 1951WDNWWI Report Post Thanks(0) Quote Reply Topic: WD Allis Light switch resistor Posted: 27 Nov 2016 at 9:38pm
	Just got a replacement three position light switch for the WD Allis. I am still using the original 6 volt generator with a cutout. How many ohms should the light switch resistor on a WD measure? I thought it would be 2 ohms because you want about a 3 amp charge. The new one measures .5 ohms. I have had this tractor for 18 years and finally decided to fix the switch. Used it all these years just pulling out the switch for high charge for about 30 minutes each time I used it since it did not charge with the switch all the way in. When I opened up the console the original resistor was missing and the wiring was 'interesting'.

Sponsored Links

DougS Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 03 Nov 2011 Location: Iowa Points: 2490	Post Options Post Reply Quote DougS Report Post Thanks(0) Quote Reply Posted: 27 Nov 2016 at 9:52pm
	It doesn't work that way, 51'. That resistor limits the field current. It is not a current limiter or voltage regulator. It should work as it is.

Steve in NJ Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Andover, NJ Points: 11950	Post Options Post Reply Quote Steve in NJ Report Post Thanks(0) Quote Reply Posted: 27 Nov 2016 at 10:11pm
	The OEM resistor used on the original Delco switch is rated at 3.0 Ohms. When all the way in, the Gennie should be putting in approx. 3 amps to the Battery at around 400-450 rpm. Once pulled out to the second position, the resistor is bypassed, Headlights come on, and the ground increased which increases the charge to about 5-7 amps depending on where the third brush is located. Third position is no lights/high charge. Charge should remain the same around 5-7 amps to the Battery.... HTH Steve@B&B
	39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife