6 volt cub issue

Generator will run like a motor when I hot wire it. Voltage regulator looks almost new inside. Battery doesn't show a charge with a meter, new volt meter doesn't move either. I tried running a wire from F post to ground, supposed to by pass regulator?? That didn't do anything either. Tractor has a mag so pulling cable off battery doesn't tell you if it's charging..... Any ideas? Tried 2 different voltage regulators.

Is the bat terminal on the regulator hot?

Did you polarize the generator?
Dave

I did. Never saw a spark.....

Fritz, can you explain?

I had sketched this earlier. I removed the wire going to pull switch. Tractor has a magneto......

I think you should always see a spark.
Dave

Hot as in has battery voltage on it with a VOM

run a jumper across the bat and gen terminals on the v reg and see if it charges. the bat terminal should be hot . (has power, not temperature hot). if nothing, ground the field and jump across bat and gen terminals momentarily and see if it charges. if not .genny is bad. i just went thru this with my cub. it would eat voltage regulators. turns out the insulation on the field winding had deteriorated and it would randomly short out taking the v reg out. the last time it finally gave up. just picket it up today from the rebuilder.

one other thing, be sure the v reg has a good ground to the chassis. one mounting side of the v. reg has a copper ground strap. be sure that has a good clean ground.

Grandpa, if you work through my Troubleshooting procedure it can help find the cause of non charging


https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ttalk&th=2060825

John T
John Ts Charging Troubleshooting

Ok. First issue.... Old amp gauge didn't have a needle, but power on both studs. New volt gauge only has power on one side...... I think the side where wire comes in from starter.....

if you have a voltage gauge one side comes from the ignition on switch and the other terminal goes to ground. if you have a mag ignition you will need to put a switch in on the power to the v gauge otherwise it will always be on

Mag.... So I need a toggle switch in between starter and gauge? To turn power off to gauge?

that is the way i would do it so you can shut the gauge off when not using the tractor.

another thought, you could also put the switch on the ground side of the gauge too

If you didnt see a spark when you polarized the generator, I think you have a dead wire at the bat terminal

With a volt gauge you need to put all the wires from both terminals of the amp gauge on the negative terminal of the volt gauge, this is assuming you are retaining a positive ground. Then the plus terminal would have the switch that connects it to the tractor frame. To automate that you could ..ground.. it to the tractor frame using an oil pressure sender for a light. Simple closes a circuit to the tractor engine when the oil pressure is up.

Edit: Not to say what Glenn said is incorrect I am just telling you a handy way. You are replacing the amp gauge with a volt gauge I the same place. You need to have a junction terminal for those wires to be connected so you may as well use the terminal on your volt meter. And I am just guessing it has a terminal lug like the ammeter. Your old ammeter was a current conducting device across the terminals. Your volt meter only measures the voltage across the terminals. It would be like putting you test meter in there and expecting it to carry current to run the lights on your tractor. It does not even have enough resistance to run a dash light if your tractor had one. Hope this helps and just wanted you to understand the wire connection. In no way did I mean to say Glenn is not correct. Unlike some on here I read others post and try to fill in or clarify points. Not simply repeat what others say because I have no time to make consideration for their thoughts.

2nd edit: The oil pressure sender you need would not be for a light that would be backwards. You need an electric fuel pump cut out style. See link.

https://www.napaonline.com/en/p/ECH...GQAKEAQYDyABEgIkFPD_BwE&gclsrc=aw.ds&

This post was edited by used red MN on 02/21/2022 at 09:59 pm.

SIMPLE YOU GROUNDED THE FIELD AND IT DIDNT CHARGE MEANS THE GEN IS BAD

A voltmeter is not intended to conduct current. The Amp meter is in series with the charging circuit. If you are installing a voltmeter you will have to tie all the wires that were on both sides of the amp meter together. Then a switched volt meter can be installed in the dash hole.

Good explanation Mr Red. I don't think I saw your edit on my first read through.

Ok. First issue.... Old amp gauge didn't have a needle, but power on both studs. New volt gauge only has power on one side...... I think the side where wire comes in from starter.....

Amp gauge is almost like a short circuit so voltage should be same on BOTH sides, thats normal

Volt gauge has voltage on one side (such as the big battery cable maybe where it wires to the hot INPUT side of a starter solenoid or switch) while other is hooked to ground IE NO Voltage

John T

If power is left on the volt gauge it will constantly draw a small amount of current so some sort of a method to turn it off is advisable.

John T