I’ve had family visiting and the 2008 GEM has been great fun for them until last night immediately after unplugging from a full charge on the SDI battery pack.
Has anyone else had this happen and ID the source(speed sensor, MM or controller)? This is not the first time I’ve fully charged the battery. Symptom was: the GEM immediately dropped to Turf speed, display showed 81 and the wrench indicator was showing. Power cycle never showed any KPH number other than zero and quickly drops to Turf speed.
Instead of testing the speed sensor with a DMM I figured I could just swap out the Magic Magnet and see if the display will show speed and it does.
So it looks like the Magic Magnet failed. I did put it back in the circuit and tried it and got the 81 code again and 0 speed. Looked and found it’s potted so I can’t figure out what failed nor repair it.
I will look more closely at the pins and sockets with a light and a magnifier.
I’ve also worked the 3 switches back and forth and will retest once I finish charging the EV in the driveway.
@Inwo I checked all pins and sockets and all are shiny metal and saw now water ingress indications. I also retested after working the switches and still zero kph when moving.
As can be seen in the pic above, it has been secured to the frame and resting against the shock tower so couldn’t move much. I’ll box it up and send it out once someone verifies I have the address correct.
My guess is something right on the edge of not working. The MM requires power from red wire. You could check voltage with and without MM. The controllers are skimpy supplying power to the hall effect.
I measured 12.7V(black to red wires) from the car(disconnect from speed sensor) and then with the MM connected and at the speed sensor end I measured 11.6V
I didn’t want to probe into any wires or through any seals to get measurements with the speed sensor connected.
