# 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:** 13\ **Page:** 1
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [May 10, 2019, 4:11am UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/1 "2019-05-10T04:11:01Z")
I changed out 3 of my Trojan 1275’s this spring. When charging I get a blinking red indicator. I checked individual battery voltage during charge and one battery (a new one) is significantly higher at over 15V the other 5 batteries are charging at about 13.5V. Is this an indication I got a bad battery? Not sure how to proceed, any advice would be appreciated. ---
**Author:** ![Alex9a](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@Alex9a](https://community.electricforum.com/u/Alex9a)\ **Post date:** [May 10, 2019, 4:43pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/2 "2019-05-10T16:43:39Z")
how many red blinks? ---
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [May 10, 2019, 5:32pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/3 "2019-05-10T17:32:54Z")
Seems to blink continuously … ---
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [May 10, 2019, 5:33pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/4 "2019-05-10T17:33:17Z")
I will look at it closer when I get home. ---
**Author:** ![Alex9a](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@Alex9a](https://community.electricforum.com/u/Alex9a)\ **Post date:** [May 10, 2019, 6:09pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/5 "2019-05-10T18:09:04Z")
according to the manual - 1 blink - High Battery Voltage Detected you battery balancing to equalize voltages? ---
**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… ---
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [May 10, 2019, 9:44pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/7 "2019-05-10T21:44:31Z")
> [@dougl](#): > > red flash: battery presence DC voltage out of range close master disconnect, check battery voltage and polarity Looks like what is going on with mine. Agree 15V + battery is suspect. Just not sure how to check further. I guess I can put it on a normal charger by itself and see how it acts. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [May 10, 2019, 10:54pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/8 "2019-05-10T22:54:02Z")
Were they balanced when new battery was added? New one is full at 15v. Charge the others to match. ---
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [May 11, 2019, 2:05am UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/9 "2019-05-11T02:05:38Z")
I charged them all individually a couple of days before I purchased the 3 new ones. Sounds like you recommend recharging them individually (balancing) and see if that fixes it. I agree, I will try that and get back with you all about results. I’m thinking I may have to end up replacing the other 3 older batteries. ---
**Author:** ![dougl](https://avatars.discourse-cdn.com/v4/letter/d/b19c9b/32.png) [@dougl](https://community.electricforum.com/u/dougl)\ **Post date:** [May 12, 2019, 1:39am UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/10 "2019-05-12T01:39:09Z")
After you fully charge a battery and move the chrger to the next battery, wait 2 hours and then measure the voltage of the freshly recharged battery(the one charged before the currently charging one ). Document the voltage and do this for all the batteries. Two hours after the last battery has been charged, measure all of the battery voltages and write those numbers next to the previous recording. if flooded lead acid(Trojan 1275), they should all be in the 12.6V-13.0 range if in good shape. ---
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [May 12, 2019, 5:29pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/11 "2019-05-12T17:29:39Z")
Well I decided to drive it around the neighborhood and plug it in again. I did that and checked back in 24 hours and had a steady green light!! I drove it again this morning and plugged it in again, we will see how it behaves. ---
**Author:** ![jasonr](https://avatars.discourse-cdn.com/v4/letter/j/ecd19e/32.png) [@jasonr](https://community.electricforum.com/u/jasonr)\ **Post date:** [May 28, 2019, 6:49pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/12 "2019-05-28T18:49:24Z")
Hi, having the same issue, along with another one. Did it go back to normal for you? ---
**Author:** ![djohnk](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@djohnk](https://community.electricforum.com/u/djohnk)\ **Post date:** [June 10, 2019, 4:23pm UTC](https://community.electricforum.com/t/72v-gem-blinking-red-indicator/16017/13 "2019-06-10T16:23:21Z")
Yes, it went back to normal, but occasionally I have to charge one of the older batteries separately. ![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/f/f00c618823b1c94f2e32857aefd8b7273b4ac67b.png)