A faulty alternator ( typically due to a faulty voltage regulator) CAN overcharge a battery which would result in a “input overcurrent” error. Did you confirm your alternator is pushing the normal range of about 13.8V to 14.7V? I assume you have the proper gauge wire for your cable run as well, but asking just in case. Recently, I had a defective starter battery that caused my alternator to send WAY too much power (15.2V+) constantly to my battery. Might want to check your battery as well. Your alternator will be under max stress while the engine is idling and the load will only decrease once you bring up the RPMs and drive it. Charger 1 will prematurely kill your alternator if you use it while idling.
thanks for the heads up i will get it checked