[AT] Tractor batteries

[Robert L. Holtzer]

Try this article given me by an electronics engineer:

http://mgaguru.com/mgtech/electric/et098.htm

Bob Holtzer

On 1/17/2014 12:59 PM, charlie hill wrote:
> Am I imagining this or wasn't there a problem back in the day
> when someone with a 12V neg ground car touched bumpers with
> a 6V positive (or any positive) ground car?  Metal bumpers.  I seem
> to remember it was something that had to be taken into consideration.
>
> Charlie
>
> -----Original Message-----
> From: Spencer Yost
> Sent: Friday, January 17, 2014 3:13 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] Tractor batteries
>
> I always thought it was coincidental:   The adoption of 12V happened roughly
> the same time negative ground was being adopted; so many manufacturers did
> both at the same time.
>
> Like Steve, I heard corrosion of ground points was the reason for the
> grounding switch but I have no idea if that is correct.
>
> Spencer
>
> Sent from my iPhone
>
>> On Jan 17, 2014, at 0:06, Greg Hass <ghass at m3isp.com> wrote:
>>
>> Was looking at some old tractor stuff online and was reminded of
>> something I  have know for years but have never, at least in my failing
>> memory, seen a plausible explanation as to why most 6 volt tractors have
>> positive grounds whereas 12 volt tractors have negative ground.  At
>> first I thought it could be because 6 volts had generators, however, our
>> first 12 volt tractors had generators and later models had alternators
>> so that doesn't seem to be the reason. Any and all answers would be great.
>>       Greg Hass
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