avery v charging system

Hi all, I am working on a Hercules ZXB-3 with a 3 brush Delco # 1101851 generator, and after downloading tons of old pdf's I still cannot determine the field circuit arrangement to correctly polarize / troubleshoot the genny. I need to know if it is an internally grounded or externally grounded field circuit. Any help in this manner would be appreciated!! (The ZXB-3 I am working on, is actually in a Mity Kat dozer and I ask you Avery guys because I believe the ZXB-3 is also used in the Avery V with the same generator). Thanks, Jim

I don't know if its a Class A system like many Delcos used on Deere and IHC and Oliver or a Class B like used on some Fords and Massey Harris etc. If its an A the Field circuit begins on the third brush, terminates out the gennys FLD post and then gets its regulated ground via a Low High charge switch or a Voltage Regulator.

If its a Class A System (suspect if its a Delco) below is my Troubleshooting Procedure. It also tells how to Polarize and how to determine if non charging is a Genny or a Voltage Regulator problem in Para 5.

John T
John Ts Class A Troubleshooting

Your Herc is most likely a Class A system, as my friend John T suggests.

AFIK only Ford - and the few other tractors fitted with Autolite electrics - ever used Class B field circuits.

A "B" type would have the field direct to ground, not a third brush. I can concieve of no way it could use the third brush. I give it an "A". Jim

Thanks for the replies! First of all, JohnT simplified generator troubleshooting and thanks for that (wish I had that for my Willys). Next, the Delco manual that I am reading refers to the different circuit configurations as type 1 or type 2. So I gather type1=what you call type"A" and type 2=what you call type "B" from some comparing. So that is what I am trying to figure out as the Delco manual states that the three brush generator can be found in type 1 or 2 configurations. From what I make out of the manual, it appears the third brush (start of the field) takes on the polarity of the main brush it is nearest to. That is: if the 3rd brush is placed next to the "ARM" brush in the generator, then it is positive and then the field needs to be grounded externally. And the other is true if the 3rd brush is placed nearest the "GROUND" brush then the field needs to be "juiced" externally. So with that I learned just recently, I am thinking that maybe I can try to ohm out the generator circuits to figure out the layout of what I have and go from there. Any thoughts?
For the record:
-Neg ground system
-Delco 5908 2 unit regulator
Thanks gang,
Jim

Ok, I think I got it. I sat down with the generator at the kitchen table with two diagrams. I put paper under the brushes and performed continuity checks and came up with the type 1 or type "A" configuration as you guys so kindly told me. I guess I was hoping that someone had this exact genny and had been thru this before me. I had never seen a 3 brush generator before and was a bit unsure. :roll: Learning every day! Now I will follow JohnT's streamlined process starting with the very step this all started at: polarization...

A link to a very good 159 page PDF that was helpful..(see manual page 8/9 for the 3 brush diagrams):

http://www.tm9-801.com/tm9-1825a/Tm-9-1825a-Electrical-Equipment-Delco-Remy-12-January-1944.pdf

Thanks,
Jim