Got to be a short some where, load test em individually and find the defective one. Getting one hooked up backwards when charging will screw things up as well, I pulled that stunt earlier this year on my cranking bat.
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If you are using an extension cord, it may be too small a gauge to get the amperage you need. I was using a 100 ft red cord, not sure the gauge, and I got a larger yellow cord and no problems since.
All good advice to check but I go for a bad battery.
Your problem is not buying my 4-bank charger like Sat said. You could have saved money and time. Sounds like you got a bad battery(s). Do you keep your charger plugged up 24/7? Never unplug them. The new chargers have a trickle charge that kicks on when the battery charge goes down 2%.
Five emails back and forth with Anchor Express and I'm no closer to being satisfied.
Cancel your order and I will have you one Thursday. You cancel your order and Minn Kota takes care of the paper work or just refuse shipment.
ATM, did you read your pm?
Your 15 amp won't fit. If I cancel my order I have to wait on the refund to have the funds to buy another. If Ricky wants my business he needs to let me know what he sells. His website shows no chargers. Considering how these folks screwed up an order, I can only imagine how issuing a refund would go.
What did you order? a 10 amp 4 bank?