New Holland 1720 Alternator wiring problem

   / New Holland 1720 Alternator wiring problem #1  

jnhelton

New member
Joined
Sep 20, 2010
Messages
10
Tractor
new-holland 1720
Anyone have a color-coded wiring diagram for the alternator on a 1720? I discovered I don't have a warning light for the alternator. In my investigation it turns out that 2 wires in the wire bundle within inches of the alternator aren't terminated. A white red striped with brown spots wire that goes back to the light. A white with brown spots (no stripe) that goes to the "L" terminal on the Alternator.
If I connect these, the light works perfect but the tractor won't stop running with the ignition switch. The reason is that the "L" wire carries a constant 2 volt current when the alternator is spinning. This voltage bleeds back to the fuel stop solenoid and is just enough to keep it from shutting off.
HELP! Thanks
 
   / New Holland 1720 Alternator wiring problem #2  
Hi -

I bet if you put a diode in the line that feeds the idiot light, that will stop the run on. A radio shack 276-1661 (6A @ 50v) is what I have used in the past. The stripe (cathode) end of the diode faces the alternator in the circuit.

Tom
 

Tractor & Equipment Auctions

1240 (A50490)
1240 (A50490)
New Power Line 400 Plastic 3pt. Spin Spreader (A50774)
New Power Line 400...
TRUCKING INFO (A50774)
TRUCKING INFO (A50774)
2014 MACK CHU TANDEM AXLE DAY CAB (A51219)
2014 MACK CHU...
2023 CATERPILLAR 299D3 SKID STEER (A51242)
2023 CATERPILLAR...
LONG 445 TRACTOR (A51243)
LONG 445 TRACTOR...
 
Top