6v negative ground?

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Nybz
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6v negative ground?

Postby Nybz » Wed Apr 01, 2020 12:04 pm

Just going through the electrical on the new ‘ 53 cub tractor.
I kept hearing about how these tractors are positive ground.
So I am confused because it looks like my tractor is 6v negative ground....? Is that possible?

I am alittle confused about the whole positive ground thing, so I might not be thinking about this right.

But the tractor does start and run, as it is.

Can it operate as a negative ground? Or is that why my charging is acting funny and the lights don’t work?
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Re: 6v negative ground?

Postby tst » Wed Apr 01, 2020 12:30 pm

its positive ground from the factory, is it charging

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Re: 6v negative ground?

Postby Jim Becker » Wed Apr 01, 2020 2:48 pm

Somebody probably just put the battery in backwards because he didn't know better. If you have original style components, it will tolerate having the battery backwards. (This is NOT true of later solid state or alternator systems!) The only thing you HAVE TO do when reversing the battery is to polarize the generator before you start it. This will also reverse the readings on the ammeter.

What do you mean by "charging is acting funny"? Does it show a charge when you turn the switch on before you start the engine?

Whatever is wrong with your lights is a separate problem. Ignore it until you get the charging sorted out.

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Re: 6v negative ground?

Postby Don McCombs » Wed Apr 01, 2020 3:00 pm

On a related issue, I'd be surprised if you're getting an adequate ground with that corroded cable attached to the tool box. Once you get your charging issues resolved and polarity reversed, replace that ground cable.

http://farmallcub.com/phpBB2/viewtopic. ... 40&t=82170
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Re: 6v negative ground?

Postby Lt.Mike » Wed Apr 01, 2020 4:45 pm

That battery cutoff switch isn’t the greatest either. I tried the same one and issues.
Quote by Gary Pickeral I like
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Re: 6v negative ground?

Postby Nybz » Wed Apr 01, 2020 8:43 pm

Is this a solid state/alternator system?

When I checked the charging it was around 6.50v so I imagine it wasn’t charging.

I got a bunch of parts coming from TM

It may just be a case to get a 12v system....
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Re: 6v negative ground?

Postby tst » Wed Apr 01, 2020 9:01 pm

this should help check it out, is the regulator mounted, looks like its just hanging there, look at the regulator, on the mounting tabs and the bottom, it might say 6 volt positive or negative ground, looks like a not to good wiring job, the ground cable needs to be bolted to the chassis not the tool box, never charge right with bad grounds
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08-Regulatortroubleshootingchartrev.gif

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Re: 6v negative ground?

Postby staninlowerAL » Wed Apr 01, 2020 9:21 pm

Nybz wrote:Is this a solid state/alternator system? ...
The picture is a Delco generator (6v), can't see any markings on the regulator.

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Re: 6v negative ground?

Postby Eugene » Wed Apr 01, 2020 9:30 pm

Nybz wrote:Is this a solid state/alternator system?
Neither. It's a generator.
When I checked the charging it was around 6.50v so I imagine it wasn’t charging.
Maybe. Not connected to battery charger. Crank over the engine a couple turns without starting the engine, then check the battery voltage and again running the tractor at 3/4 throttle. No change or a slight battery voltage drop - not charging.

Have you been charging up the battery?

I would do as the others have suggested prior to changing out any parts.

Edit. 6.5 volts is in the good ball park for a 6 V battery.
I have an excuse. CRS.

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Re: 6v negative ground?

Postby Jim Becker » Wed Apr 01, 2020 10:01 pm

OK. Turn the battery around so positive is grounded. Go over all the connections to clean them up and make sure they are snug. Along with the specific problems others mentioned, I see the wire on the generator "A" terminal is too loose to work. Bad ground connections are common problems. Then polarize the generator (Briefly jump battery voltage to the generator "A".).

After doing the above, check to see if it is charging. If not, use the flowchart tst posted.

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Re: 6v negative ground?

Postby Nybz » Wed Apr 01, 2020 10:36 pm

Thanks for all the help folks. New tractor, new quirks.

I unbolted the regulator and the generator wire to clean them up, that is why they are loose.

I currently dont have a 6v charger so I haven't been keeping it charged.

The amp meter wasn't reading it was charging when it was running, it was going into the discharge zone. That's why I decided to dig deeper.

I have been changing the tire widths to straddle a 4 foot bed,(jees those rear wheel weights are heavy!) and the gas tank is off currently because of a missing head bolt. So I can't check it running right now.

so is there potential damage to the electrical system running the polarity backwards? I am amazed it runs really well.

Thanks again appreciate your help and patience, I am sure you answered all these before. I have been searching on the forum, gaining some good tips.

This tractor has to get to work soon! the season is coming

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Re: 6v negative ground?

Postby Eugene » Wed Apr 01, 2020 11:02 pm

Nybz wrote:Is there potential damage to the electrical system running the polarity backwards?
No. Not with a generator.

If you haven't been charging up the battery, the generator and regulator are working.

Reverse the battery polarity so that it's positive ground. Then polarize the regulator. Your electrical system should be good to go - at least the generator, regulator, amp meter, and battery portion of the electrical system.

Do make the corrections the other guys suggested.

Edit. Didn't read far enough back. Jim made the same recommendations on the battery, etc..
I have an excuse. CRS.

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Re: 6v negative ground?

Postby Jim Becker » Thu Apr 02, 2020 12:01 am

Jim Becker wrote:What do you mean by "charging is acting funny"? Does it show a charge when you turn the switch on before you start the engine?

You haven't answered this question yet. Which way does the ammeter needle move when you turn the ignition switch on?

This is a serious no-BS question we need answered!

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Re: 6v negative ground?

Postby Nybz » Thu Apr 02, 2020 12:05 am

The amp meter was showing slight discharge when ignition switch was turned on.

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Re: 6v negative ground?

Postby Glen » Thu Apr 02, 2020 12:30 am

Hi,
The generator in your pic above is an original style Delco 6 volt generator, like a 1953 Cub came with.

Below is a page from the 1955 Cub operator's manual, showing the original electrical system.
The system is the same as a 1953 Cub had.

http://farmallcub.com/rudi_cub/www.clea ... e%2050.jpg

The plate on the generator should have a model number on the left side. The original model number was probably 1100501.
The voltage regulator is mounted on a plate attached by the generator mounting bolts.

Below is a listing at TM Tractor showing a new plate, you can look at the pics. :)

http://www.tmtractor.com/new/el/952fp.htm


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