Polarizing voltage regulator

pixer · Jan 9, 2017

I've had the battery out on occasion on my47 8n 6 volt .ive read that you set the polarity by shorting out across two connections on the voltage
regulator. If the polarity is not right will the battery not charge. Why is this important

Bob · Jan 9, 2017

You don't polarize the voltage regulator, you polarize the GENERATOR (even though the temporary connection needed to do that is often made at the voltage regulator.

If you've simply removed the battery and replaced it (ASSUMING connections were correct before and after replacement), there's NO need repolarize the generator.

The iron field coil polepieces in the generator retain a TINY amount of magnetism between "runs" of the engine, enough to get the generator charging again at startup.

If the generator is removed and knocked around, disassembled and reassembled or sits unused for years it MAY need to be polarized to restore the residual magnetism in the polepieces so it will charge upon startup, and at the correct polarity.

Another reason to polarize would be if the battery has been connected backwards and the engine started (which often results in stuck/burned VR contacts).

If in doubt polarize BEFORE startup.

pixer · Jan 9, 2017

Thanx for input bob no w,ring connections or gen removal,mostly I was curious as reason very informative

Bob · Jan 9, 2017

For more info, check out the manual linked below, around page 50.

http://farmallcub.com/rudi_cub/www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/GSS-1310%20Electrical/index.html
Electrical

Tim PloughNman Daley RIP · Jan 9, 2017

I concur that you do not need to polarize the generator every time unless it was removed and replaced. It won't hurt anything on the other hand either but be sure you know what you are doing and which units you have. An 8N VR is polarized by momentarily arc sparking with a screwdriver across the BAT and GEN(ARM) terminals. Do not touch the FIELD terminal or you'll let the smoke out your VR. You should have the 'A' circuit design on your 8N. Only 'B' circuit designs are done different like early 9N's and NAA's. Some disconnect their battery when tractor isn't used for 30days or more and some use a battery tender to keep battery up to snuff. Simply disconnecting and swapping the battery now and then won't require polarizing generator every time. If you seem to be having charging issues, you have another problem like a weak generator or battery. Shown below is a modern 8N Voltage Regulator with terminals marked BAT ARM and FLD. If you have the original AUTO-LITE VR still, terminals are marked but nay be too corroded to see labeling.

Tim *PloughNman* Daley(MI)

Dell (WA) · Jan 10, 2017

Pixer.........You ask "Why is this important".......Unlike the 2-terminal roundcan cut-off fer the 9/2N's, the 8N has a 3-terminal squarecan voltage regulator underneath the oil pressure gauge. This is a handy place to polarize the D.C. genny. I just use a wideblade stubby screwdriver that I have to "arc-spark" the side-by-side BAT and ARM terminals, engine OFF. You kenn use bailing wire iff'n you want. Many neuibie tractor owners install the 6-volt battery negative (-) ground like their 12-volt BelchFire-V8 with alternator. Alternators demand negative (-) ground. As fer yer 6-volt genny, it will work either positive (+) or negative (-) ground ...BUT... you haffta POLARIZE it fer which ever way the 6-volt battery is grounded. There are some obscure advantages fer positive (+) ground, mostly about the sparkies. Modern sparkplugs are so much better than the original H-10 Champions. Recommend AutoLite 437's gapped 0.025........HTH, the amazed Dell and sparkie-meister

Polarizing voltage regulator

pixer

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Bob

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pixer

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Bob

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Tim PloughNman Daley RIP

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Dell (WA)

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