Troubleshooting Alternating Red and Green LED on NOCO Genius Mini 2 Bank Charger

Updated 09/09/2020 | Published 05/01/2019

Question:

i just purchased the gen mini two bank and hooked it up and the charging light blinks from red two green and the error light does nothing i have two 12 volt deep cycle battery for my 24 volt trolling motor i disconnected and hooked to each individual battery and still the same thing can you tell me what the problem is?

asked by: BRIAN E

Helpful Expert Reply:

The NOCO Genius Mini On-Board Battery Charger - AC to DC - 2-Bank - 12V - 8 Amp # 329-GENM2 is showing that your batteries are not being recognized by the charger. The alternating Red/Green is standby mode so since you have your batteries connected, they may be depleted lower than the charger can recognize. I reached out to my tech contact who said if they are depleted below 2 volts, you would need to use an alternate charging system to get them to that recognizable 2 volt for this system to then charge the batteries to the 12V prior to use for your trolling motor.

If you don't have another charger you can use jumper cables for a few minutes to your vehicle with your vehicle running to get the batteries to have the necessary minimum voltage. You will of course want to disconnect the charger for your batteries prior to doing this.

expert reply by: Jason S

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Patricia S.

3/18/2020

the yellow exclamation symbol is illuminated on my mini 2 bank charger

Chris R.

3/19/2020

If just the LED beneath the yellow exclamation symbol is illuminated, it indicates a "reverse polarity" condition. This means you just need to reverse your battery connections and the issue should be resolved. Just let me know if it doesn't go away or if anything else comes up.

Don C.

6/8/2020

When I hooked up to electric I got two red indicators. Left to charge for several hours. I never got a green until I unplugged and reconnected to the electric. Then I got 1 green and 1 red. I unplugged again and got 1 red and 1 green (reversed). After checking with amp meter, main battery is showing 13.4 volts (full charged?) I'm not sure what's going on here? Usually get two green after only a couple hours of charging. Batteries are only about 2 years old and lightly used.

Chris R.

6/11/2020

I'm not quite sure what's going on, either. I would make sure the battery terminals are clean of any corrosion that could be preventing a good connection to the charger eyelets. If this doesn't help simply unplug the charger from AC power for a bit and try again - it may just need to be reset.

Don C.

6/11/2020

@ChrisR I tried hooking up again after allowing time to reset and all worked like it should. Both sides turned green within a couple of minutes. Probably should always make connection to the the charger last after plugging into the electric outlet to avoid the issue. Thanks

Ira

9/4/2020

If a fuse is gone on one bank, would the other charge

Jon G.

9/5/2020

I see no reason why it wouldn't charge as the fuse is what completes that circuit.

Vaughn P.

9/6/2020

if the charger is not the first thing on the post the charger may not recognize the battery and cause it to flash red and green.

Mohammed D.

9/6/2020

Hi, I have a 1 bank Noco Marine charger. It worked fine the first time and i got the green light for my deep cycle marine batteries on a boat. Next time i plugged it in the charger keeps getting the red light and tripping. Almost like a relay doing a click and then it turns off the red light comes and clicks and shuts off again. The weird thing is that it also makes the little led light on my wire outlet go off and on when it clicks. Can anyone help with whats happening here? Thank you

Jon G.

9/9/2020

@MohammedD It sounds like there might be a short somewhere that is overloading the system and causing a circuit to trip. Have you tried plugging it into a different outlet? Also check all of your connections to make sure that they are clean and secure.

Mohammed D.

9/9/2020

@JonG thank you i will certainly check again