Hotflashjr
Well-known Member
- Location
- Western MA
I replaced the alternator on my JD 40 with a GM 1 wire. I bought a new wiring kit from Agri-Services based on this configuration as well as the alternator. They were helpful as always and I am confident everything is wired correctly; 12 volt, negative ground without cutout or relay.
I also replaced the ammeter. I bought one for a 40 but it reads from -60 to +60 while the old broken one was -30 to +30. The alternator is charging and I get a positive test light at the 1 wire post on the alternator and back at the ammeter. When starting the ammeter shows discharge to -20 and will charge back up to 0 in about 2 minutes. The ammeter never goes above 0 but will consistently sit at 0 with the tractor running. With the lights on the ammeter shows a small negative and as soon as I shut off the lights it goes back to 0.
I think the charging system is working as it does charge but my concern is the ammeter not going above 0. Do I have something wired wrong or is that just how a 1 wire 12 volt change on these tractors work?
I also replaced the ammeter. I bought one for a 40 but it reads from -60 to +60 while the old broken one was -30 to +30. The alternator is charging and I get a positive test light at the 1 wire post on the alternator and back at the ammeter. When starting the ammeter shows discharge to -20 and will charge back up to 0 in about 2 minutes. The ammeter never goes above 0 but will consistently sit at 0 with the tractor running. With the lights on the ammeter shows a small negative and as soon as I shut off the lights it goes back to 0.
I think the charging system is working as it does charge but my concern is the ammeter not going above 0. Do I have something wired wrong or is that just how a 1 wire 12 volt change on these tractors work?