Voltage Regulator on a farmall Cub

Ivan in Mich · Jul 18, 2013

Does a voltage regulator have to be polarized like the cutout does or is it ready to go when first installed

Bob · Jul 18, 2013

NEITHER a voltage regular NOR a cutout need to be polarized. It is the GENERATOR that needs to be polarized, which in the case of typical IH/Delco "A" circuit generators, requires it"s "Armature" terminal to be momentarily connected to the non-grounded side of the battery. Since completing this circuit is easily done at the cutout or VR, folks get the idea they are polarizing THOSE components, when they are actually polarizing the GENERATOR.

What polarizing does is to restore the residual magnetism in the polepieces and "frame" of the generator in the correct direction so the generator begins charging with it"s polarity matching that of the battery at initial startup.

Saves having to replace the smoke that can potentially leak out of the electrical system at a cost of quite a few bucks!

Ivan in Mich · Jul 19, 2013

This is what I needed Thank You

John T · Jul 19, 2013

AAAAAAAAAA MENNNNNNNNNNNN

Not much to add to that other then perhaps,

Yet another reason the Billy Bobs and Bubbas of the world are of the mistaken impression the VR or Cutout Relays need Polarized, IS BECAUSE WHEN THEY BUY ONE THERE ARE INSTRUCTION HOW TO POLARIZE IN THE BOX. Why is that Billy??? Its because if the tractor is started and the genny is polarized opposite from the system YOU CAN FRY THAT NEW VR HMMMMMMMMMMMMM

Also on many 4 terminal VR's where the GEN/ARM terminal is hard to get at under the VR, simply flash instead (from a hot ungrounded battery voltage source, such as present on the BAT terminal on the VR) to the gennys ARM post

I think we pretty well have him covered now??

John T

teddy52food · Jul 19, 2013

I wish Del on the Ford 8n site sees Bob's and John T's reply. He still insists that you polarize the regulator.

John T · Jul 19, 2013

No harm in "insisting" or having an opinion I reckon EVEN IF ITS DEAD WRONG LOL. Its kinda like the old politicians quote "everyone is entitled to their own opinions, but NOT their own facts"

Take care Teddy

John T

gene bender · Jul 19, 2013

The system wants Positive ground make sure thats the way it is before polorizing the genn.. Does it have a cut-out or a regulator.

Ivan in Mich · Jul 19, 2013

It has a cutout now but I am going to try and put a reg on it

gene bender · Jul 20, 2013

Make sure you get the correct regulator for that gen. Read the Delco # on the gen to make sure you get the correct reg. The three brush gen takes a different reg than the two brush model and make sure they are for pos ground.

Voltage Regulator on a farmall Cub

Ivan in Mich

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Ivan in Mich

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