# 72V GEM blinking red indicator **URL:** \ **Category:** GEM Forum\ **Created:** [May 10, 2019, 4:11am UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017 "2019-05-10T04:11:01Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![dougl](https://avatars.discourse-cdn.com/v4/letter/d/b19c9b/32.png) [@dougl](https://community.electricforum.com/u/dougl)\ **Post date:** [May 10, 2019, 9:28pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/6 "2019-05-10T21:28:48Z")
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](https://community.electricforum.com/t/zivan-ng1-charger-error-codes/1507): > > 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… --- _[View the full topic](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017)._