So one battery is 0V? 12.55=62.5V and since that would look like 10.4V over 6 batteries to the charger it’s probably too low. From the docs I’ve seen though, they want to see a voltage of > 1.0V/cell and since a 12V battery has 6 cells, 66=36V so anything over 36V should seem enough to not get the low voltage/2 blink indicator. But I’m not well versed in DeltaQ so maybe someone who knows first hand what the DQ low voltage threshold is?
Hard to believe one battery is 0V though so what does “didn’t charge” mean?
I found the black wire. To confirm, on the controller there are terminals marked A1, A2, F1, F2, Pos, Neg. The last two are next to the firewall. The black wire should be connected to the Neg terminal? Right?
My GEM is now charging and running great. This experience all started with a worn wheel bearing! Now with the motor rebuilt, a new Delta Q from LithiumGod, and a refurb controller, along with the wheel hub assembly; I’m now running as before.
2008 E4 with 7700 miles.
Again, thanks for helping me overcome my ignorance.