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6 volt regulator adjustment

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POPPER DICK

03-20-2002 15:12:02

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I installed an 8 volt battery in my 1950 model B.

A man who owns an auto electric shop near me loaned me a set of tools that he has owned for 50 plus years used to adjust regulator voltages.

With tractor at fast idle my volt meter measures 7.5 volts at the field terminal. Per his instructions I bent the spring post of the field terminal coil in both directions (up & down) with zero change made at the volt meter.
My measurements were made between the field and battery terminals and also between the field and negitive post of the battery.

I have not received my electrical manual from John Deere yet and I'm not sure the wiring is hooked up correctly at the regulator. The generator battery terminal wire is coming from my ammeter post and the regulator "L" terminal is going to the ignition switch. The field terminal going to the generator field post.

Can anyone help with some schematic information on what I have said above.

Thanks Dick

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Clooney

03-20-2002 17:04:06

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Re: 6 volt regulator adjustment in reply to POPPER DICK, 03-20-2002 15:12:02

Dick, the John Deere generator system uses a grounding of the field (F) terminal to energize the field & therefore a voltage measurement of the field voltage is meaningless. ~It's been a while since I have adjusted a regulator so I'm going to have to think a minute here, plus you have an 8 volt system.....
~Remove the wires from the (BAT) & (L) terminals on the regulator (you will have to hook them together with a jumper wire to get power to run the ignition), then hook the (BAT) terminal of the regulator through a... (I don't know what to tell you here, a 6 volt system uses a 1.5 ohm resistor & 12 volt system uses a 7 ohm resistor so probably somewhere around 3 ohms for an 8 volt system)... resistor to a GOOD clean chassis ground & hook your voltmeter (use the correct polarity for your ground) to the (L) terminal on the regulator & a good clean ground on the regulator case. Now you should disconnect the field wire from the (F) terminal on the regulator & put a 30 ohm rheostat in that circuit, but probably just disconnecting & re-connecting it will work for your adjustment. ~Start the tractor & set throttle to fast idle (WOT) then run for about 10 minutes to stabilize the charging system, then you should open the rheostat, (or pull the field wire) then slowly remove the resistance (or reconnect the field wire) until you have 0 ohms resistance in the field control of the charging system. At this time you should see the charging system voltage on the voltmeter. Make your field point adjustment, then open & again slowly close the rheostat to check for the new charging voltage. Do this until you have the charging voltage set where you want it.
~You will also need to set the cut-out relay voltage to work with the 8 volt system as it is set for 6 now. I'm just guessing here but it should probably be somewhere around 8.1-8.8 volts. It should be set right after the field control is set as the regulator will then be up to operating temp.
~You might need that 30 ohm rheostat for this as the voltage should be increased s-l-o-w-l-y for the cut-out setting. Move your voltmeter lead from the (L) terminal to the (ARM) post of the generator (leave the ground side hooked where it is) now open the rheostat to put resistance in the field circuit (leave it there for a little while) then s-l-o-w-l-y remove resistance while watching the voltmeter (the voltage will slowly raise as you turn the rheostat) when you get a noted drop in the voltage, the cut-out has just closed, note the voltage (it should be adjusted to close between 8.1 & 8.8 volts), you will need to do this procedure after each adjustment.
~All voltage readings should be made with the regulator cover at least set on the regulator as it effects the voltage settings. ~You might be able to run the battery about 1/2 down or add a series of headlight bulbs to the battery to give the generator a load to charge into but the resistor is the desired constant load for the generator while you make the adjustments. You will need a fairly high watt resistor or multi resistors for the charging load or risk burning the resistor up.
~After all this, you learn to appreciate the new electronic regulators in the modern alternators.

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Clooney [part2]

03-20-2002 17:20:35

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Re: Re: 6 volt regulator adjustment in reply to Clooney, 03-20-2002 17:04:06

Dick, I forgot, by your explanation your generator is hooked up correctly.
~Before doing much else you probably should polarize your generator to make sure it is charging in the correct direction...Use a jumper wire & momentarily hook the (BAT) & the (GEN) terminal on the regulator together, you should see a small spark, if so remove the wire & you are done. CAUTION: do not EVER touch power or a powered wire to the (F) terminal on the regulator or generator, or regulator damage can & probably will result.

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Will-Texas

03-22-2002 03:57:43

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Re: Re: Re: 6 volt regulator adjustment in reply to Clooney [part2], 03-20-2002 17:20:35

Clooney; on the polarization...do you touch bat. to gen. terminal with engine running on stopped?

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Clooney

03-23-2002 06:22:31

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Re: Re: Re: Re: 6 volt regulator adjustment in reply to Will-Texas, 03-22-2002 03:57:43

Will, the engine should not be running.

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POPPER DICK

03-20-2002 20:26:57

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Re: Re: Re: 6 volt regulator adjustment in reply to Clooney [part2], 03-20-2002 17:20:35

Clooney,

You must have writers cramps. I sure appreciated very much the time you have taken to explain this to me. Sort of wants to make me go back to the 6 volt or convert to 12 volt. I do like a challenge though. I have time to work on it so I think I will print your post and digest it.

Once again thank you very much

Dick

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Clooney

03-21-2002 03:24:37

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Re: Re: Re: Re: 6 volt regulator adjustment in reply to POPPER DICK, 03-20-2002 20:26:57

Dick, seeing as you have already tried to adjust the regulator you will need to re-set it, or buy a new one, even if you go back to a 6 volt system.
~The 8 volt battery works good on those old 6 volt systems, & other than the fact that you will have short headlight life & a little shorter ignition point life the added 2 volts at the coil during cranking & the added cranking voltage will make a 6 volt system act like it is new & will help cover higher starter & wire resistance on an old tractor.
~If you have the Wico distributor you will want to keep the voltage setting to the low side as those Wico�s don�t like high voltage & the parts are getting real expensive��..

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POPPER DICK

03-21-2002 05:31:17

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Re: Re: Re: Re: Re: 6 volt regulator adjustment in reply to Clooney, 03-21-2002 03:24:37

Thanks Clooney for the post.

My distributor is a Delco Remy. The ID plate is stamped 111558 for a model number and 679 for a serial number. It seems to me that the stamper reversed the numbers between serial and model numbers.

I spoke with an employee of the generator shop I referred to in the earlier post and he requested that I give him the generator/regulator set up to take into his shop and put it on his machines and let him check out both and set up for me.

Clooney I have never been in this shop nor have I met this man. It is through his employee (of twenty years) a close friend of mine through our church that I know of him. Per this employee I have learned that this man in his younger days worked quite a bit with the two cylinder tractors as well as many other brand tractors. Supposedly he takes pride in this fact. According to my friend he has quite an array of old tools. He has been doing generator/alternator work all of his life. He is 67 years old.

The shop is about twenty miles from where I live. This employee has worked on my 620 generator and my auto electric needs over the past ten years. I always give the units to him at home and he takes them to work with him, repairs them and returns them to me at home. One of these days soon I am going to meet this man at his shop and see for my self.

Thanks again Clooney, your very considerate and courteous to this forums needs as well as many more.

What a great forum.

Dick

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ChuckW

03-20-2002 15:30:57

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Re: 6 volt regulator adjustment in reply to POPPER DICK, 03-20-2002 15:12:02

I've messed with dozens of those regulators and have never had one work correctly after adjustment. In my opinion the best thing is buy the new regulator, there is instructions with it on polorizing and hook up. The best place to go for your diagram is the B parts book, it has the exact layout. I'm not sure what the deal is with the 8 volt battery. I always changed my B's over to 12 volts, changed the generator, regulator, and light bulbs. Didn't change the starter and had no problem there. Starting power more than doubled. You can also change to negative ground in the change over by switch amp leads. If you have the WICO distributor you may need to install a resistor block. Good luck.

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