Hello first post. I’m helping a friend who just got a 2002 Gem e825 With dead batteries.
I recommended the Mod 3 Tesla cells packs that are 24v and he purchased 3 of them.
I put them in series and installed them.
Here’s what works:
Here’s what’s noted:
- 17v off the black fin dc/dc converter on the two aux wires that hang
- 82v off each side of main battery disconnect
- 82v through fuse and on other side of main contactor??(where the fuse is)
- 82v Across the controller
When key is activated, 100 Battery? then 1009 milage?? Then goes blank.
Buzzer sounds when in road mode and not turf mode.
I hear relay click when turning key on
Gem does not go forward or Reverse
Parking break Plastic switch Arm moves when brake is applied and released.
Potentiometer pedal connector under dash is connected and in good shape.
When plugged in, zivan charger works
(I will reprogram for lithium or get him to purchase a new charger)
I have my meter, but I don’t know the pin out for potentiometer pedal and what pins to use for the Ohms reading.
My next thing is to clean the main battery disconnect lugs. The lugs under dash at fuse/contactor and on the controller as well as the motor.
Any addition fault finding techniques would be greatly appreciated.
I’m 22 years military with electronics back ground and have personally built my own electric propulsion vehicles.