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 too hot, timeout battery oversize, charger undersize, load test battery
green flash without audible alarm: battery temperature out of range, extreme hot or cold weather, charger will reset in one hour
red yellow flash with audible alarm: charging current high DC current out of range logic circuit failure, test charger
red green flash with audible alarm: battery voltage high DC voltage out of range logic circuit failure, test charger
yellow green flash with audible alarm: rotary switch set improperly bad charge selection verify correct rotary switch selection for battery type
red yellow green flash with audible alarm: thermal failure overheating of charger check charger fan and air flow, battery oversize