Troubleshooting Noco Mini 2 Flashing Red and Green on One Of The Two Connected Batteries
Updated 06/10/2019 | Published 06/08/2019
Question:
I have a vanagon with a main and Aux battery with a Surepower isolator between them. Both are 12 volt and registered 12.5V before connecting up the charger. Bank 2 auxiliary battery is red charging but Bank 1 Main is flashing red to green, no error. The isolator is clicking every 10 seconds meaning going from lowest charged battery for about 10 minutes then quits.
asked by: Dan S
Expert Reply:
The NOCO Genius Mini On-Board Battery Charger - AC to DC - 2-Bank - 12V - 8 Amp # 329-GENM2 is showing that your second battery is not being recognized by the charger. The alternating Red/Green is standby mode so since you have your batteries connected and they have 12.5 V, the one battery is not being recognized.
I reached out to my tech contact who said the isolator isn't an issue with the way the charger works, so that could be a completely separate issue. She said the GENM2 Series charging banks will flash red and green back and forth when it cannot detect a battery is present. This can happen when there is no battery connected to that bank, if the voltage on the battery the bank is connected to is lower than 3V, the connection to the battery is faulty, the inline fuse (15A) is faulty, or if the charger goes into "Bulk Timeout" while charging which is over 41 hours.
She said that if you swap the leads from one battery to the other, you will be able to determine if the issue follows the battery or if the issue follows the charger. If it follows the battery, the battery is the issue but if it follows the charger, then there may be an internal issue with the charger that has a 5 year warranty from date of purchase.
You may want to remove the isolator to see if somehow that is impacting the battery charger even though the their tech said it shouldn't. If that solves the issue when nothing else does, you have an isolator or wiring issue.
