polarizing generator

[Dan Nederhoff]

I have a 1958 John Deere 420 Utility that I rewired.
What I need to know is exactly how to polarize the generator? This is a 6 volt positive ground system.
The generator was redone, so I want to make sure I correctly polarize it and eliminate the possibility of causing damage to it.

I would appreciate anyone that could help me out here

Thanks

Dan

 

[Joe (Wa)]

This may help.
Gen

 

[Dan Nederhoff]

Just to be sure this procedure is applicable to a positive ground system?

 

[John T]

To Polarize use a length of wire etc to momentarily flash/jump from the Voltage Regulator's BAT terminal over to its ARM/GEN terminal and you ought to get a small spark. If the VR's ARM/GEN terminal is hard to get to simply jump from the BAT terminal direct down to the Gennys ARM post. If the VR is hard to get to period, jump from any hot ungrounded battery voltage source such as where the big batetry cable atatches to the starter switch or solenoid down to the Gennys ARM post. Of course, this works for Pos or Neg ground, thats the whole purpose of doing all this so the genny starts charging at the correct polarity and you dont let the smoke out of the VR.........

John T

 

[John T]

To Polarize use a length of wire etc to momentarily flash/jump from the Voltage Regulator's BAT terminal over to its ARM/GEN terminal and you ought to get a small spark. If the VR's ARM/GEN terminal is hard to get to simply jump from the BAT terminal direct down to the Gennys ARM post. If the VR is hard to get to period, jump from any hot ungrounded battery voltage source such as where the big batetry cable atatches to the starter switch or solenoid down to the Gennys ARM post. Of course, this works for Pos or Neg ground, thats the whole purpose of doing all this so the genny starts charging at the correct polarity and you dont let the smoke out of the VR.........

John T

 

[buickanddeere]

Doesn"t matter - or + chassis.
When "polarizing". The gen pulley should twitch a little in the direction of normal rotation. If the belt has been loosened, the gen will actually turn as a motor. It"s a good function check of a suspect generator.
Never hurts to take a voltmeter and check the battery on a generator equiped machine. In particular a + chassis machine.
It"s very common for somebody to boost a dead machine and apply the - clamp to chassis even though the machine is wired + to chassis.
The battery ends up charged in reverse. The spark will also be weaker as the coil is now backwards as well.

 

[Anonymous-0]

The spark voltage is an alternating current so I challange the idea that voltage would be less.

 

[Kentb of SWMO]

Some engine WILL NOT run right when the coil is not wired to the corrct polarity of the grounding system. Hard to find because many people do not think of checking the coil polarity!!!

Kent

 

[buickanddeere]

Nothing to challenge. It"s well known common knowledge that"s been proven time and again. The coil delivers higher output when properly wired. That includes the sparks as the resonate circuit "rings".