Polarizing my starter/generator on my 185

IH CUB Lo-Boy Series - 154, 184, 185 Forum -- Questions and answers to all of your Lo-Boy related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
danbly72
Posts: 27
Joined: Sun Apr 30, 2017 5:22 pm
Zip Code: 17350

Polarizing my starter/generator on my 185

Postby danbly72 » Sun Aug 25, 2019 10:30 am

Keep hearing different things on how to polarize my starter/generator,can someone help me out please and tell me how,it is on tractor with regulator on(new regulator and starter/generator)did not hook up battery yet but don’t want to mess anything up so I’m looking for help please

Jim Becker
Team Cub
Team Cub
Posts: 15181
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Polarizing my starter/generator on my 185

Postby Jim Becker » Sun Aug 25, 2019 11:58 am

In general, you polarize a generator by momentarily jumpering from the regulator BAT to the regulator GEN. This sends a brief burst of battery voltage into the generator "A" terminal and current through the field coils. In your case, you have a starter/generator and can forget the whole thing. The first time (and every time!) you hit the starter switch, it puts voltage into the generator and polarizes it.

danbly72
Posts: 27
Joined: Sun Apr 30, 2017 5:22 pm
Zip Code: 17350

Re: Polarizing my starter/generator on my 185

Postby danbly72 » Sun Aug 25, 2019 1:04 pm

When I received my S/G and my regulator it came with a paper saying to polarize it so that’s why I’m confused about it some people say yes and some people say no,Bob at Hamilton Bobs told me to polarize it so that’s why I’m confused

User avatar
MikeEyre74
Cub Star!
Cub Star!
Posts: 225
Joined: Wed Apr 03, 2019 5:44 am
Zip Code: 06063
Tractors Owned: Standard F-Cub, 1949
John Deere Model A, 1948
Wheel Horse 312-8, 1987

Re: Polarizing my starter/generator on my 185

Postby MikeEyre74 » Sun Aug 25, 2019 1:29 pm

I did mine yesterday after I put in a new battery. Noticed it wasn't charging, so I polarized it.. jumper wire from battery voltage (The "A" terminal) to the "F" terminal on the regulator. It jumped right back to life and started charging just like that.
Standard F-Cub, 1949
John Deere Model A, 1948

Jim Becker
Team Cub
Team Cub
Posts: 15181
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Polarizing my starter/generator on my 185

Postby Jim Becker » Sun Aug 25, 2019 2:36 pm

The paper is probably a standard set of instructions that gets stuffed in the box regardless of whether it is for a starter/generator or not. It is a good general guideline to always polarize the generator after working on a regulator or generator. It is a lot simpler to just stuff the paper and tell everyone to do it than to explain when it is needed. A starter/generator can not tell the difference between electricity that comes through a jumper wire and electricity that comes through the starter switch.

The proper way to polarize is between the regulator BAT and GEN terminals. NEVER jump voltage to the generator FLD terminal. It is a dead short through the regulator. When not running, the A terminal is at 0 volts. So Mike, your attempt at polarizing probably did nothing.

The F terminal is used to polarize a "B" circuit generator. But the Delco systems on Farmalls are all "A" circuit systems.

User avatar
MikeEyre74
Cub Star!
Cub Star!
Posts: 225
Joined: Wed Apr 03, 2019 5:44 am
Zip Code: 06063
Tractors Owned: Standard F-Cub, 1949
John Deere Model A, 1948
Wheel Horse 312-8, 1987

Re: Polarizing my starter/generator on my 185

Postby MikeEyre74 » Mon Aug 26, 2019 8:51 pm

We'll, clearly you know more than I about these things... But 12.5 volts all day long before jumping that wire and 13.X afterwards made me scratch my head and wonder a bit.
Standard F-Cub, 1949
John Deere Model A, 1948

danbly72
Posts: 27
Joined: Sun Apr 30, 2017 5:22 pm
Zip Code: 17350

Re: Polarizing my starter/generator on my 185

Postby danbly72 » Tue Aug 27, 2019 7:22 pm

So Jim,if I a wire from positive on battery to A terminal on S/G will that polarize it?

Jim Becker
Team Cub
Team Cub
Posts: 15181
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Polarizing my starter/generator on my 185

Postby Jim Becker » Tue Aug 27, 2019 8:14 pm

Jim Becker wrote:. . . polarize a generator . . . sends a brief burst of battery voltage into the generator "A" terminal . . .

BigBill
10+ Years
10+ Years
Posts: 7232
Joined: Sat Jul 22, 2006 5:02 pm
Zip Code: 00000
Location: in northern usa

Re: Polarizing my starter/generator on my 185

Postby BigBill » Fri Aug 30, 2019 11:06 pm

Make sure the tractor is idling. Then polarize it.

If your having problems with your electrical system ohm out your grounds first. My new wiring harness will have the ground wire to the s/g mount.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

Jim Becker
Team Cub
Team Cub
Posts: 15181
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Polarizing my starter/generator on my 185

Postby Jim Becker » Fri Aug 30, 2019 11:20 pm

BigBill wrote:Make sure the tractor is idling. Then polarize it. . . .

No. That is just flat-out wrong.

mozer71
501 Club
501 Club
Posts: 579
Joined: Wed Apr 04, 2018 1:33 pm
Zip Code: 22650

Re: Polarizing my starter/generator on my 185

Postby mozer71 » Sat Aug 31, 2019 2:11 am

I replaced the voltage regulator some years ago and also checked out the S/G brushes and bearings. It wouldn't charge at first but I followed directions. There was a brief "arc" and that is all it took. It doesn't seem like the engine was idling but maybe it was. CRS..


  • Similar Topics
    Replies
    Views
    Last post

Return to “Lo-Boy Series - 154, 184, 185”

Who is online

Users browsing this forum: No registered users and 2 guests