genny

[stroik]

Whats the best way to test a genny to see if its charging and can you put the wires backwards on the resistor? I have ordered an I-T book but not here yet so any help would be Great

 

[JMOR]

(quoted from post at 11:54:35 04/30/12) Whats the best way to test a genny to see if its charging and can you put the wires backwards on the resistor? I have ordered an I-T book but not here yet so any help would be Great

esistors are NOT directional.......in is out or out is in.....no matter.
Put a voltmeter across battery, take reading, start & run tractor at high idle for a few minutes & if battery voltage is increasing, then it is charging.

 

[Dell (WA)]

stroik........you ask......."Whats the best way to test a genny to see if its charging"....... would you believe measuring its voltage output??? Usually at the battery posts is best. Gitta el-cheapo ANALOG (needle) meter at the hardware store. Modern digital meters don't like sparkies from brushes and sparkplugs. (ittza technical thing)

You ask........"can you put the wires backwards on the resistor?".......surprizingly enuff, electrons don't care which end of the resistor is input or output. ...NOR... do they care whether positive (+) or negative (-) ground. And even more amazing, ground can be positive (+) and negative (-) at the same time. ........the amazed Dell

 

[stroik]

Ok I checked it with a meter and I am not seeing a charge whats the next step? A new genny or could it be the resistor or cutout?

 

[JMOR]

(quoted from post at 12:54:04 04/30/12) Ok I checked it with a meter and I am not seeing a charge whats the next step? A new genny or could it be the resistor or cutout?

ot resistor. While running, jumper across cut out & observe for battery voltage increasing during run time as before. Remove jumper when engine stopped.

 

[stroik]

OK I jumper across the cutout and still not seeing a charge whats next or what does this mean?

 

[JMOR]

(quoted from post at 13:19:07 04/30/12) OK I jumper across the cutout and still not seeing a charge whats next or what does this mean?

robably means generator not working or wiring problem. Loosen or remove fan belt from generator, remove wire from generator, connect jumper wire from non-grounded side of battery to generator & see if generator spins as though it were an electric motor. If yes, then it will also generate, so look for wiring problems. If not, then probably time for a trip to the generator shop.

 

[stroik]

Well I jumper the gennyand it does not spin so looks like the genny is bad? right

 

[JMOR]

(quoted from post at 14:42:34 04/30/12) Well I jumper the gennyand it does not spin so looks like the genny is bad? right

omething wrong with it, but gen shop may be able to repair it, so don't trash can it.

 

[stroik]

up date on genny. Well I took it out and opened it up and LOL nothing left of the windings no insulation left and the arm don't look much better so I guess I will be buying a new one. How can i tell if the cutout is ok or bad? And as far as the resistor if that was bad it would not start right?

 

[JMOR]

(quoted from post at 18:31:11 04/30/12) up date on genny. Well I took it out and opened it up and LOL nothing left of the windings no insulation left and the arm don't look much better so I guess I will be buying a new one. How can i tell if the cutout is ok or bad? And as far as the resistor if that was bad it would not start right?

s that a 3 brush gen with a screw adjustment on the 3rd brush? Unless you have a variable voltage dc supply & meters, not much you can do to test a cut out. Resistors generally fail open & in that case tractor would not start.

 

[mgriff543]

To test your cutout,with all wires off the cutout, hook battery to the terminal that normally hooks to the generator and ground the base of the cutout. you should hear a click that indicates the points closing.With the points closed check for battery voltage at the battery terminal with your meter. What you are basically doing is running current backwards through the cutout just like the generator does when its charging

Now I've never worked on the complete charging system on the tractor, just the generators and cutouts but I can't think of a reason for there to be a resistor in the charging circuit. You should have battery voltage (either key switch controlled or not it doesn't matter) at the BAT terminal of the cutout. Make sure you do or you will quickly incinerate your new genny.

Hope this helps, Mike

 

[JMOR]

(quoted from post at 23:16:26 04/30/12) To test your cutout,with all wires off the cutout, hook battery to the terminal that normally hooks to the generator and ground the base of the cutout. you should hear a click that indicates the points closing.With the points closed check for battery voltage at the battery terminal with your meter. What you are basically doing is running current backwards through the cutout just like the generator does when its charging

Now I've never worked on the complete charging system on the tractor, just the generators and cutouts but I can't think of a reason for there to be a resistor in the charging circuit. You should have battery voltage (either key switch controlled or not it doesn't matter) at the BAT terminal of the cutout. Make sure you do or you will quickly incinerate your new genny.

Hope this helps, Mike

didn't suggest that, Mike, because the Ford spec sheet gives a min/max pull-in voltage of 7.0/8.5 volts.........so unless his 6v battery is really 'up', then he would call his cut-out bad because it didn't pull-in.

 

[mgriff543]

Good point, I always used 12v on my bench so I was kinda spoiled. That said, it was pretty rare for a point type cutout to go bad and if you can hear it trying to kick in chances are its ok.....ya know the more I ponder this considering the deep fried genny etc a new cutout is probably not a bad idea....they're cheap enough. Mike