Positive ground 6 volt ?

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ub54
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Positive ground 6 volt ?

Postby ub54 » Mon Jul 20, 2015 2:16 pm

Been coming along pretty well on my first redo and had just put on the rebuilt mag and new plug wires . Any way since I have a hard time getting my hand onto the fan to turn it I thought I'd just spin it with the starter . I had another battery (12 volt ) I was going to use since my generator was not wired up, but when I went to take the old 6 volt out it had been hooked up negative ground . Never ran across that before , could it be right ? Don't want to melt anything down .

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Re: Positive ground 6 volt ?

Postby Bob McCarty » Mon Jul 20, 2015 2:26 pm

All the older Cubs that are 6 V are positive ground. You can use your 12 V battery in the same configuration. Make sure the lights are off and don't spin the starter too long as you can overheat it.

Bob
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ub54
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Re: Positive ground 6 volt ?

Postby ub54 » Mon Jul 20, 2015 5:09 pm

Yeah Bob , but this one was hooked up negative ground . I don't know if it was an accident or if they just didn't know which is why I wondered if there ever had been a + ground generator on a cub.

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Re: Positive ground 6 volt ?

Postby Bob McCarty » Mon Jul 20, 2015 5:47 pm

Sorry, I misread that. Not sure about the answer to your question.

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Re: Positive ground 6 volt ?

Postby Glen » Mon Jul 20, 2015 6:19 pm

Hi,
The 6 volt Cubs were positive ground, and the 12 volt Cubs were negative ground. That is how IH made them. All Cubs below serial number 224401 were 6 volts originally. :)

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Re: Positive ground 6 volt ?

Postby BigBill » Mon Jul 20, 2015 6:25 pm

All 6 volt systems were positive ground.

I had a older rambler come into the dealer with a electrical problem. The head mechanic took the job. He had a pile of new diode trios burned out. He couldn't figure it out. I walked away and came back later and told him to put the battery cables on right. I owed him.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

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Re: Positive ground 6 volt ?

Postby Barnyard » Mon Jul 20, 2015 6:39 pm

To answer your question, If you just want to use it to spin the starter go ahead and hook it up with pos ground. Just disconnect your generator wires and don't turn on any lights. Don't spin it too long or you could do harm, but a short spin will not hurt the starter.
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Re: Positive ground 6 volt ?

Postby Bob McCarty » Mon Jul 20, 2015 6:47 pm

I think his question was whether there was a 6 V positive ground generator. Does the generator care whether the ground is + or -?

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Re: Positive ground 6 volt ?

Postby Barnyard » Mon Jul 20, 2015 7:37 pm

ub54 wrote:but when I went to take the old 6 volt out it had been hooked up negative ground . Never ran across that before , could it be right ?

I guess I might be confused. I thought he wondered if the negative ground was right. :?
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Re: Positive ground 6 volt ?

Postby Eugene » Mon Jul 20, 2015 8:47 pm

Generator polarized to match the battery's ground.
I have an excuse. CRS.

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Re: Positive ground 6 volt ?

Postby clodhopper » Mon Jul 20, 2015 9:34 pm

Eugene wrote:Generator polarized to match the battery's ground.

Yes. As long as you polarize the generator to match the battery polarity, you should be fine.

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Re: Positive ground 6 volt ?

Postby Clark Thompson » Wed Jul 22, 2015 1:02 pm

you can use a 6 volt battery neg or pos ground depending on the voltage regulator polarization.I have installed a 12v in 6 volt cub without any problems just to spin it a little faster. as mentioned don't turn lights on or run very long with a battery ignition. will blow bulbs burn out coil and points.. cubs from 1964 to 1975 had 12 volt positive ( generator ) systems. 1976 to 1979 use a alternator that was negative ground.Do NOT!! hook up the alternator to positive ground. If you do you will soon notice smoke and smell the alternator burning itself out. :censored:
Collector of Farmall cubs and cub cadets.Injoy helping people keep their cubs running. Years of experipnce.

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Re: Positive ground 6 volt ?

Postby Matt Kirsch » Thu Jul 23, 2015 7:47 am

Yup, the electrical system on a Cub does not care which battery post is grounded, provided you do two things:

1. Polarize the generator.
2. Swap the ammeter wires (or live with it reading "backwards").

The starter turns the same direction regardless of polarity because it has no permanent magnets.

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Re: Positive ground 6 volt ?

Postby Smokeycub » Fri Jul 24, 2015 7:20 am

Another much less likely possibility is the battery might be charged with reverse polarity. It happened to me once when I asked a buddy of mine to put a charger on my Cub and he connected the charger backwards. The battery was dead enough that it took the reverse charge no problem. So for a period of time I reversed the terminal connections on the battery making it look like it was wired negative ground. It's easy enough to determine with a voltage check on the battery.
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Re: Positive ground 6 volt ?

Postby ub54 » Sun Jul 26, 2015 7:38 am

Well I put in a new 6 volt battery and hooked it up positive ground . I didn't have the generator wired up yet .When I did I melted the coiled up wire on the light switch ( see post on switch resistor ) I wonder if that was why ? And if so , can I put it back to negative ground ?


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