I would have been happier with 0v. Verify your meter across the battery. I'm not sure what you shold see voltage wise cause current is the working element, but it looks like KE is out to lunch.

You need to get a wiring diagram and look at the powering circuit for the KE controller if all the above is accurate.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician