idiot light charging system?

[rusty nut]

my friend did the wiring on my to30 a long time ago,lately the idiot light stays on after i shut the tractor off,why does it stay on with tractor not running?and how do i fix it?thanks for the help.
 

[John (UK)]

Most likely cause is the Regulator is faulty, it may just be sticking and a slight tap may disturb it but it does look as though it is on its way out....John(UK)
 

[rusty nut]

the alternator is brand new,and it is suppose to have the low rpm regulator in it,I bought it off ebay.
 

[Bruce(OR)]

If the seller was triodiode, he can help you fix it. If the seller was some one else. . .
 

[Richard L]

rusty nut, what idiot light are you referring to on a TO 30? My TO 30 does not have a idiot light.
 

[rusty nut]

it is the light on the dash that lets you know if your charging system is charging or not.
 

[Jon Hagen]

Are you using a Delco internal regulator alternator ? If so, check if the #1 excite wire is not shorted to the #2 sense wire.

If the #1 wire is shorted to the #2 wire, #2 is hot all the time and will backfeed through the idiot light to the ignition coil if both the idiot light and coil are connected to the same ign switch terminal. This will make the light burn when the tractor is stopped.
If not already installed, buy a delco alternator harness repair plug at the auto parts store.
This plug makes for a more professional liiking job and is safe from shorts.

If the gen light goes out when you unplug the #1-#2 plug at the alternator, that would point to an internal short in the alternator or regulator.
Delco alt wiring.

 

[Richard L]

I don't have one. Never did.
 

[John (UK)]

Sorry I misunderstood what you were saying, I thought that you had a generator with an external Regulator. We don't get many tractors with an Alternator and a warning light they usually fit an ammeter as it gives more information. So apologies for the misunderstanding...
John(UK)..fergusontractors@hotmail.com
 

[JMOR]

[rusty nut]

don't be sorry John,I appreciate all information given,haven't had time to look at tractor since i posted question,it does seem strange that this problem wasn't happening with the old alternator,thanks for everyones reply.