cut off relay problems

I have a 1941 9n with a single pole generator front mount distributer six volt battery. I wired it like the diagram I got off yesterdays tractor I assume it is stock like it was in 1941. The trouble I have the tractor runs fine starts good but when I shut the key off the amp gauge discharges and will run down the battery. I took the cover off the cut off relay switch and the points are stuck together after I pull them apart the amp gauge goes back to normal. Their seems to be current at the points all the time if I push the points together when the tractor is not running it will spark and stay closed until I pull them apart. Again I assume this cut off relay is just a electromagnet and completes the circuit when the generator puts current to it and should release when the generator or tractor stops, again this is what I think and might have the wrong idea. I have tried everything I know to fix this situation including filing the points on the cut off relay. Tried tracing the current back from the resister block and the only thing I can come up with is the amp gauge might be bad and feeding back but it is new. Tried disconnecting the wire on the generator when the tractor is not running to see if the generator might be shorted out but that was not it, if I remove the wire form the amp gauge it will kill the power to the relay and operate normal but then the amp gauge will not work. Is their any way I can test the amp gauge to see if it is shorted out other buying another new one? Your suggestion's would be greatly appreciated.

just Deere........sounds like you need to "re-polarize" yer cut-out relay. I use a pair of pliers handles to reach around the round can cut-off. You can use bailin' warr iff'n you want. Just "arc-spark" the cut-out terminals, engine OFF. Simple, eh? Isn't that better then futtzin' with ammeter? ........electrical Dell

I bought two cutouts that were bad out of the box...installed bridge rectifier and no more problems--this was 7-8 yrs ago..Noone will know it is in the round can instead of the points that stick and cause the problem..

Thanks for the advice I will try it.

I am not familiar with a bridge rectifier where can I get one and do I use in place of the cut off relay or wire it in line before the relay? Thanks.

Deere........bridge rectifier is 4-diodes wired in "square" configuration. Usually used to change AC-to-DC to run yer TV set. As used in this application, one-diode allows current into the genny to excite the magnetic field and when the engine turns over, the genny sends volts BACK thru the bridge to charge the battery. The diodes are generally good fer 200-volts and because ittza 4-way, it don't matter whether its positive or negative ground. You gittchur bridge at Radio-Shack iff'n they're still in business. You don't gitta bridge at yer local tractor parts store. ........electrical engr Dell who still recommends a real cutout relay fer the electrically challenged

On my jd mc i used a switch to replace the cutout relay. Just have to remember to shut if off.

wire it like this.

get a bridge rectifier that is rated for at least 6a. most in that size will be 25a

this assumes positive ground.

" i used a switch to replace the cutout relay. Just have to remember to shut if off."

Which is another way of saying "Sooner or later I'm gonna let the smoke out of may generator!"

(quoted from post at 06:27:25 04/02/15) " i used a switch to replace the cutout relay. Just have to remember to shut if off."

Which is another way of saying "Sooner or later I'm gonna let the smoke out of may generator!"

Click to expand...

Have never hurt the generator but I have drained the battery a few times, but then so does a stuck relay, no difference.

Go to a generator/starter shop,and tell them what you have and what you need. They'll give you an option of an electronic one or a point-type one. I got my generator rebuilt,they said that probably the cutout was bad,and for a few bucks,I had a well running and charging tractor.

As others have said, bridge rectifier is the way to go, I gutted my cut out about 4 yrs ago and put in a bridge rectifier because the points in the cut out kept getting stuck, draining the battery. Could not remember to disconnect a battery cable. "0" problems since.

I tried repolarizing my cut out switch, ordered a new cut out switch and like some one said that one is no good either. My question is instead of adding another switch to shut the current off when the tractor is stopped couldn't I just wire the ignition switch in line of the cut off switch and separate the current that way, that way it would turn on and off with the ignition switch and I wouldn't have another switch to deal with, or am I missing something.

You would not want the charging current going thru an ignition switch..
Do you have the new one wired correctly?
In spite of what someone thinks, you do not polarized a cut out relay. What you are doing when you jump the two connections is polarize the generator.
Do you show a charge when the two wires going to the cutout are connected to each other with the engine running? If the generator is working you should have current flow. with not running it should show a discharge like stuck points in relay.

Thanks I will try it.