72V GEM blinking red indicator

[dougl]

That one battery which is charging at 15V seems suspect for being bad.

Here’s a thread on the Zivan charge indicator lights:

Zivan NG1 charger error codes

This is a list of error codes for the Zivan charger used on many pre-2005 GEMs. Daniel blank: normal if charger unplugged no AC voltage check line voltage and charger internal fuse red flash: battery presence DC voltage out of range close master disconnect, check battery voltage and polarity yellow flash with audible alarm: thermal sensor failure thermistor out of range check connection and resistance of thermal sensor green flash with audible alarm: charge time too long, charger t…