My name is Pat, I am in Potrero Costa Rica and my client is bringing in a bunch of electrical vehicles to sell and I am the tech to help him. Pretty new to electric vehicles but have been doing this type of work for 40 years.
Welcome Pat.
You can probably find the most tech info by reading the posts on The 5 GEM threads. 99% of GEM posts fit all models but you will have to scan all 5 to glean everything technical.
Welcome patfrank my name is Jason. I Jason welcome ya patfrank!! 
: )
Thanks guys, still have no answer to my problem. A lot of good steps, but still stumped. The owner says to reprogram the computer…Thanks, Pat