I may be speaking prematurely on the matter but here is how most onboard chargers work: If it is hooked to the battery and the lights are blinking back and forth, the charger does not recognize the battery. You may have a bad connection. Or if the battery gets too low, the onboard charger is not very effective and you will need to charge it very slowly using a portable charger. Most onboard battery chargers cannot charge a dead battery. They need a little juice in them first.If you unhook the charger from the battery and then plug in the charger they usually have a self-test built in them. They will check about 90% of themselves for errors. If the lights are blinking back and forth while unhooked from the batteries then it is passing the self-test.Usually the problem with an onboard charger is that one of the banks fail to charge. The best way to test it is to plug it in and let it start charging. Hook a volt meter to the battery on the bank that may be causing some problems – in this case, your cranking battery. Within 15 seconds the voltage should jump up indicating that the charger is working on that bank. If the volts fail to jump, the charger is not charging on that bank.Again, all chargers are different and this may not be the exact diagnosis for your charger but just in case it is, I hope this helps. If all else fails, contact the manufactuerer or let Bass Cat do it for you. Good luck! Andy Greene Greene Boat & Motor 828.286.2290Andy Greene Greene Boat & Motor 828-286-2290 http://www.greeneboats.com
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