I have a Super A that was changed to 12v years ago and has stopped charging,voltage at alt. terminal reads 12v and drops as motor continues to run.It has the Delco single wire alternator on it. I removed the alternator to replace it with a 3 wire 10si and found it has a plug on the side with the 2 terminals like the 10si. I reinstalled it and connected the wires the same as a 10si,haven't installed the diode yet,and started the tractor. Now when checking the voltage both at the altenator and the battery I get 14.5 volts. When the conversion was done the amp meter was change to a 60 amp so I really don't see the meter move any I'm thinking since the battery is new this may be normal or the meter may be bad not sure. My question is has any one run across this before and is this going to be a lasting repair or should i just replace the alternator anyway?
- Thread starter T Epp
- Start date
Mike Groom
Well-known Member
Does your meter move when you turn on the lights? You may not show anything on the meter until there is a draw on the system.
Janicholson
Well-known Member
THe reason the amp meter probably doesn't move is that the output wire from the alt probably is connected directly to the battery. (through the starter switch) This works to charge, but does not run through the amp gauge. Trace the big wire and find its connection. It should be connected to the amp meter on the terminal not connected top the start switch. Other wires at that terminal attach to the ignition sw (if battery ignition) and the light switch. Test the new wires going to the alternator with it shut off, if any of them have enough current flowing through them (when disconnected and tested between their end and the terminal they attach to with a small light bulb, or more than about 50 ma with a ma meter, or 1.5 volts tested with a volt meter, the battery will drain down pretty rapidly. The original internal Voltage Regulator was modified by a company to excite with no wires connected to the spade connectors. If it does work now, it might be OK if it shuts off when the ignition is shut off, and it does not run down the battery. Jim
You will not have any problem running a 1 wire Delco, wired as a 3 wire unit, it will work fine.
The instruction sheet that came with my last box of 1 wire conversion regulators indicated that running a 1 wire wired as a 3 wire is fine. It stated that if you are not happy with the higher rpm needed to excite your 1 wire alternator, or need an alternator charge indicator light, just wire it as a 2 or 3 wire alternator.
The #2 sense wire is not needed with the 1 wire alternator, but put it on anyway, wont hurt a thing. That way if both the #1 excite wire and the #2 sense wire are connected, you do not have to make any changes if you ever need to replace the 1 wire alternator with a stock 3 wire alternator.
The instruction sheet that came with my last box of 1 wire conversion regulators indicated that running a 1 wire wired as a 3 wire is fine. It stated that if you are not happy with the higher rpm needed to excite your 1 wire alternator, or need an alternator charge indicator light, just wire it as a 2 or 3 wire alternator.
The #2 sense wire is not needed with the 1 wire alternator, but put it on anyway, wont hurt a thing. That way if both the #1 excite wire and the #2 sense wire are connected, you do not have to make any changes if you ever need to replace the 1 wire alternator with a stock 3 wire alternator.
I have it hooked up now wired as a 3 wire and it seems to be charging.I have not installed a diode yet so I have to pull the coil wire at the ballast resister to shut it down.I have checked the wire to the coil after shutting it down and there isn't any voltage reading.I'm going to get the materials this week and rewire everything. I did check the wires on the amp gauge and it seems to be connected correctly.Wire coming from alt to gauge on one side and wire to starter on the other.There is a wire that originally came from the gen/reg circuit that goes to the ignition switch the P/O had connected together with a wire nut at the alt.Since all the wiring is old and brittle and the lights don't work I figure this is as good a time as any to rewire it all. I think I'll change the amp meter to maybe a 30amp, this might give a better reading.
Janicholson
Well-known Member
Probably will not change the reading. If the battery is charged, the needle will stay in the middle. If you were to jump start another tractor, or if the battery was low it would sur show the charge rate. Most do near nothing when running due to the excellence of voltage and charge control found with electronic regulation. If the alt is a 30 amp. a 30 amp meter is OK if higher output, the 60 amp meter is fine. Jim
Jim Becker
Well-known Member
This can't be. Everybody says that converting to 12 volts solves all your charging problems.
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