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Same Problem - Rebuilt Generator New Voltage Regulator

C

couv

Member
Generator bearings-sleeves froze up. Had Generator rebuilt. Bought new voltage regulator. 6 volt positive ground. Polarized the generator Batt to A terminal on generator.

Start it and the Ammeter pegs out to the left, on DISHCHARGE.

What is wrong ?
 
How exactly did you polarize it? Which battery terminal did you connect to the A terminal?

I've never owned a positive ground tractor, but here's what I found online on how to polarize that type of system....


"To polarize a generator on a tractor having a Delco 6V positive ground system or a Lucas
6V or 12V positive ground system, attach one clip to the A terminal on the generator. With
the other clip, briefly for only a split-second (or a spark occurs) tap the negative ( - )
terminal on the battery."
 
Sounds like somebody actually changed It to negative ground and your amp gauge is just wired backwards now. If it has lights turn them on while engine is off and see if gauge goes to charge, if it does the gauge is just wired wrong. hth, jstpa
 
A on generator to :
Batt terminal on regulator, or to the Battery itself ?

If to battery itself, which post ? + (positive ground) or - ??
 
Also, other than the generator bearings/sleeves freezing up, everything is the same as it has been for years. Battery was installed at least 2 or 3 years ago. No one has messed with the ammeter wires since I rewired the tractor about 15 years ago.

Before the genny had a problem, the ammeter would bounce to the + side while running.
 
Non grounded post which ever. Also, the F terminal must be attached to the regulator, or light switch gen control terminals, (not both), or grounded directly for the polarization to work. The circuit places voltage on the field when polarizing, but the fiel must be grounded to allow the voltage to polarize the field magnets. Jim
 
The rebuilder run it with a negative ground. Your polarizing didn't take. Did you get a good spark when connecting the wires. I would pull the belt & motorize it for a minute or two & try again.
 
OK, so I have motorized the Generator, re-polarized the NEW VR (Batt to A+ post) not running, crank the tractor and the Gauge still pegs out to Discharge side.

Tractor had no problems (other than age) before the Generator sleeves-bearings froze up. Gauge is wired the same as it has been for the last 20 years. Tractor on 6 volt positive ground
 
(quoted from post at 03:22:07 11/06/17) OK, so I have motorized the Generator, re-polarized the NEW VR (Batt to A+ post) not running, crank the tractor and the Gauge still pegs out to Discharge side.

Tractor had no problems (other than age) before the Generator sleeves-bearings froze up. Gauge is wired the same as it has been for the last 20 years. Tractor on 6 volt positive ground
Click to expand...

Is it possible that when the generator bearing froze up, did the battery go complete dead and had to be charged using a battery charger? I have worked in the tractor repair business for many years and I have seen a few positive ground systems where the battery got charged up backwards. When this happens it can drive you nuts trying to figure out why it does not work. This can be checked with a voltmeter. RED lead to positive post of battery and BLACK lead to negative post of battery. What does the volt meter read.
 
Janicholson,
Farmall 100 Operator Manual says to polarize Batt terminal on regulator to A+ terminal on generator. Tried that several times since returning home with the rebuilt generator.
Put a new Voltage Regulator. Gauge still pegs to DC
Motorized the generator with wire from Bat terminal of regulator to A+ terminal on Genny. (all 4 wires hooked up to new VR) Genny did turn. Let the genny turn for a minute or so. Re-polarized the Genny Got a good spark. Gauge still pegs out DC

What am I missing ?
 
Charlieu,
Possible, but doubtful. Been keeping this 100 running since about 1984. Was my Wife's Grandfather's first new tractor. I am well aware of it being Positive Ground 6-volt,
as,
The Farmall 200 in the family (which was my Wife's Dad's) was converted to 12 volt, Negative ground years ago, and am familiar with the difference
 
(quoted from post at 03:35:10 11/07/17) Charlieu,
Possible, but doubtful. Been keeping this 100 running since about 1984. Was my Wife's Grandfather's first new tractor. I am well aware of it being Positive Ground 6-volt,
as,
The Farmall 200 in the family (which was my Wife's Dad's) was converted to 12 volt, Negative ground years ago, and am familiar with the difference
Click to expand...

Just put a volt meter on the battery and see if the battery is receiving voltage from the generator. You should get a reading about 7 volts with the engine running. 7 volts indicate that everything is working.

I can not explain why your amp meter is reading (DISCHARGED), but the voltmeter will tell you WHAT IS GOING ON WITH THE BATTERY.

To add to my comment about the battery being charged up backwards it does happen. I have seen it more than once, I have even seen a brand new battery that was assembled wrong. The larger post was labeled NEG. and the smaller post was POS. Just put a VOLT METER on the battery when the tractor is running.
 
Charlieliu

Beginning to suspect a bad job on the generator rebuild.

Today, I started the tractor running, gauge immediately shows discharge, and checked between F terminal on Genny and the tractor's Battery Ground (+ 6 volt). Meter read ZERO.

Metered the battery with motor running and got 5.56 volts. Turned off engine and battery immediately read 6.0.

Started engine up again, and started smelling electrical smoke and shut engine off. Genny was very warm to the touch.
 
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