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4 bottom · Jun 2, 2008

I know this may sound like a dumb question but is a farmall H a positive ot negative ground. I should know this but old age may be setting in and Im away from any manuals. Thanks ED

fred goodrich · Jun 2, 2008

6volt is positive ground

Anonymous-0 · Jun 2, 2008

The Farmall H is positive ground. However, all 6 volt systems are not positive as millions of 6 volt Chevrolets were negatve ground.

Mike (WA) · Jun 2, 2008

But that brings up a good question- were there any 6 volt negative ground tractors? And were there any 12 volt positive ground tractors, other than my Oliver 550 diesel?

Anonymous-0 · Jun 2, 2008

Mike,
I don't know about 6 volt negative ground tractors, but Deere was positive ground both 12 and 24 volt until they came out with alternators in 1969.

4 bottom · Jun 2, 2008

Thank You Guys, it nice to get imfomation so quick. I walked into class this morning knowing I wanted the students to rewire the starting system on that H and I left my manual home ED

Bob · Jun 2, 2008

I don't think it's accurate to say the DEERE 24-Volts were (+) ground.

The CENTERPOINT of the 24-Volt battery stack was grounded to the chassis, making 1/2 of the system (+) ground, 12-Volt, and the other half of the system (-) ground 12-Volt.

Mike (WA) · Jun 2, 2008

Well, that sounds like a nightmare to figure out- I knew there must be some reason I was staying away from them. . .

Anonymous-0 · Jun 2, 2008

Dear Bob,
The Delco-Remy 24 volt system is pretty unique. The 12 volt grounds to the tractor chassis only apply to the lights, remote outlet, and fuel gauge. The starter, generator and voltage regulator are a strict 24 volt system and do not use the chassis ground at all. The 24 volt system does use positive ground but back to the battery and not the chassis. The starter , generator, and regulator are insulated from the chassis. The solenoid side of the starter is hooked to the negative side of the battery just like all John Deeres until alternator usage on the console tractors beginning in 1969. I always appreciate your comments as you are one of the pillars of the tractor forums.

Bob Semrau · Jun 2, 2008

The Oliver 1600 gas was 12V positive ground, too.

dangerdoc · Jun 2, 2008

When I bought my Farmall 340, I noticed the red wire connected to the battery negative. I thought it was strange but just remembered it was backwards when changing batteries.

I don't know if it is a positive ground or somebody messed up replacing wires over the years.

Mike (WA) · Jun 3, 2008

Look at the top of the coil- the two small wires are + and -. If the small wire from the coil to the distributor is from the + terminal, then the battery should be positive grounded.

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