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V-R adjustment 6v-8v.....

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banjoman09

Well-known Member
Do some of you know how to do this? If so- direct me to a video or explain please: I am using an "8V" battery in my vehicle; with a 6V genny(rebuilt) and 6V regulator- positive ground - regulator is mounted on firewall; has 3 posts(wires) on bottom of regulator. I think I need to pull the cover off and adjust someway to obtain 9-9.5 volts for the battery - is this correct? Thanks.
 
Is this a 2 or 3 brush generator. If a 3 brush the procedure is a little different. I may have a set of Delco instructions left too.
 
1941 Ford 9N, 1944 Ford 2N, 1949 John Deere B and 1950 International truck all ran 8 volt for years and never touched generator or regulator.
 
If it just has a cut out, no need to adjust. In the regulator with 2 units the one with the points closed is for the field, F on the tab where the field wire goes. Increase the spring tension to the voltage you want by turning the screw or bending the part the spring is hooked to. Do this while it is running with a good meter hooked up.
 
I really dont have a clue on the brushes...? It is a 1941 model....with two wires. (lol) The parts-house guy that sold me the 8v battery says I have to adjust regulator or the battery wont stay charged up.
 
I have worked on two different tractors not electric related that run 8v batts they said they didn't do anything to charging system. When you run the engine what voltage do you read at the gen. Most will charge high 7v or better. I wouldn't touch anything your starter must need refreshing.
 
To do this you need an accurate voltmeter. The answer depends on if you,,,,,,,,,, only have a cutout relay,,,,,,,,,,,,if the Voltage Regulator (if so equipped) has Voltage and Current control relays or a combination Voltage/Current control relay,,,,,,,,,,if its a 2 or 3 brush generator.

Sure it may be possible if correctly done to adjust spring tension or bend tabs to do what you are asking, but its just NOT something Id try to describe over the net with so many unknowns even though many others may be willing to do so.

I have seen some simple cutout relay systems work fine WITH NO ADJUSTMENS being made but I cant say what genny or VR or cutout or whatever it is you have, I'm sorry.

FWIW a few days ago Bob posted a link to a Delco publication that may or may not help (depends on your genny and VR or cutout). I have several Delco manuals in my library but don't have the URL links like Bob posted where you can go get them.

Sorry no more help, others with pictures or manuals or instructions to MATCH YOUR SYSTEM will hopefully chime in

John T
 
I suggest you do not believe the claims about a 6 volt charging system @ 7 volts being "enough" for an 8 volt battery. That is nonsense. 8 volt battery is supposed to be charged at 9.2 to 9.7 volts. At 7.9 volts, it is stone dead.

Some 6 volt generators can get over 7 volts when the voltage adjuster screw is turned up and some cannot.

Need to know some specifics about what make and model generator and regulator you have.
 
I think the Ford is internal, The JD cutout and truck have no idea. All generators are greek to me. Same as the meter.
 

I would just install the 8 volt battery and then run the vehicle for awhile. Then test the voltage at the battery. If it tests at 9 volts or more, then you are good to go.

The battery itself will limit how many volts can be charged into it.

A 6 volt generator is capable of producing MORE than 6 volts.

I own an H Farmall that had an 8 volt battery when I bought it. That battery was dead, so I replaced it with a new 6 volt. I changed NOTHING on the generator or the voltage regulator, and the battery stayed charged, but was not over-charged.
 
Again I do not know what generator we are talking about as far as the original post goes.

A 6 volt Delco generator on a Farmall is supposed to bench test at a max voltage of 7.6 volts @ 1900 RPM. The regulator is supposed to be
factory set @ 6.4 volts. None of those figures work with an 8 volt battery. 8 volt battery begins to charge at 8.1 volts and needs at least
8.5 volts to get fully charged.
 
i would have bought a 6 volt battery and save the hassle. silly parts man should know regulator adjustments are not something everyday people know how to do. usually screw things up worst.
 
Rusty FWIW I have (more then once) used 6 volt generators on a 12 volt system BUT re equipped with a 12 volt voltage regulator AND IT WORKED AND KEPT THE BATTERY CHARGED yayyyyyyyyyyy

NOTE I'm NOT saying that's engineering correct and there can be a risk if too much field current is allowed to overheat the fields they may be damaged. IM ONLYYYYYYYYYYY SAYING IT WORKED so don't anyone flame or have a calf now lol

A Generator increases it output by EITHER pumping more current through its Field Windings which increases the electromagnetic field strength orrrrrrrrrrrrr by turning it faster. Regulating field current is one job of a voltage regulator.........Of course as you well know some older tractors didn't use a full fledged precise Voltage Regulator, only a cutout relay system maybe with a manual Low/High charge control switch which controlled field current thus output......

HOWEVER of course a charging system of the correct matched components is designed to produce X volts at X amps without overheating or damaging the components. IE they manufacture 6 and 12 volt generators and voltage regulators ya know BUT if you can pump more current through the field windings (by whatever method or means), you're gonna get MORE output...

A so called 8 volt battery consists of four cells of 2.1 volts each in series for a total (subject to temp and charge state) of 8.4 volts. In order to pump current through and charge it the system is gonna have to have sufficient capacity and energy to raise the batterys voltage WELL DUH and for an 8 volt battery that's NOT 6 or 7 volts another WELL DUH but you already know that......

Fun chattin with you Rusty, take care now I enjoy your postings.........

John T
 
(quoted from post at 10:52:17 03/27/18) Rusty FWIW I have (more then once) used 6 volt generators on a 12 volt system BUT re equipped with a 12 volt voltage regulator AND IT WORKED AND KEPT THE BATTERY CHARGED yayyyyyyyyyyy

NOTE I'm NOT saying that's engineering correct and there can be a risk if too much field current is allowed to overheat the fields they may be damaged. IM ONLYYYYYYYYYYY SAYING IT WORKED so don't anyone flame or have a calf now lol

A Generator increases it output by EITHER pumping more current through its Field Windings which increases the electromagnetic field strength orrrrrrrrrrrrr by turning it faster. Regulating field current is one job of a voltage regulator.........Of course as you well know some older tractors didn't use a full fledged precise Voltage Regulator, only a cutout relay system maybe with a manual Low/High charge control switch which controlled field current thus output......

HOWEVER of course a charging system of the correct matched components is designed to produce X volts at X amps without overheating or damaging the components. IE they manufacture 6 and 12 volt generators and voltage regulators ya know BUT if you can pump more current through the field windings (by whatever method or means), you're gonna get MORE output...

A so called 8 volt battery consists of four cells of 2.1 volts each in series for a total (subject to temp and charge state) of 8.4 volts. In order to pump current through and charge it the system is gonna have to have sufficient capacity and energy to raise the batterys voltage WELL DUH and for an 8 volt battery that's NOT 6 or 7 volts another WELL DUH but you already know that......

Fun chattin with you Rusty, take care now I enjoy your postings.........

John T
Click to expand...

I did attend an auto-mechanics course, and I have worked as an auto mechanic. Most of what I relate here is from actual hands-on experience though. Experience gained from just trying to make it work again when it would be easier (and maybe cheaper) to just go get some new components. Back in the old days, a guy could almost always breathe new life into generators, solenoids, contact points, etc.
 
All I klnow is there was enough voltage increase to get them where you could hear them cranking faster and starting easier and faster. So something had to be keeping the voltage higher than the 6 volt battery.
 
Why don't you fix the problem causing you the use an 8V battery? An 8V battery is masking the problem.
 
Yes- you are quite right- 6V battery would be so simple- and done. Im doing a job for a fellow retired neighbor and he requested an "8V" battery to be installed. I will figure this out and get it- just a hassle. Thanks for everyone's input on this:)
 
(quoted from post at 19:54:50 03/26/18) Do some of you know how to do this? If so- direct me to a video or explain please: I am using an "8V" battery in my vehicle; with a 6V genny(rebuilt) and 6V regulator- positive ground - regulator is mounted on firewall; has 3 posts(wires) on bottom of regulator. I think I need to pull the cover off and adjust someway to obtain 9-9.5 volts for the battery - is this correct? Thanks.
Click to expand...
es, but a slow & time consuming process and regulator design dependent as well as temperature dependent even to the extent of cover on or cover off. Contact gap & spring tension.
 

If you can get 9.2V from that 6V generator and regulator. Either fix the problems with the 6V system or install a 12V system.
A 8volt system is the definition of a half @ssed farmer dix.
 
Guess I will start over; I'm having NO starting or charging problems; simply asking what I need to do to raise the voltage on a 6V system to get more voltage out of it to charge my 8V battery. Thanks.
 
If no starting problems why have a hard to find 8 volt in there? The reason for our 8 volt was hard starting.
 
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