I installed a brand new one yesterday. 3 of the 4 banks connected properly and began charging shortly thereafter but bank #3 kept trying to go to the Lithium setup. I tried severl times to push the button to connect to the AGM battery mode but no luck. Banks 1,2,& 3 are 6 mo old AGM TM batteries. Bank 4 battery is AGM and attached to the big motor. I left it plugged in and checked it 2 hours later and it was flashing red on top with all 3 other (25%, 50%,75%) indicators a solid yellow. Checked it again 2/3 hours later and same thing so I unplugged it overnight. Plugged it back in this morning and checked it 2 hours later and the top two were flashing green and the 25% & 50% were solid yellow so I thought I had turned the corner. Checked it 2 hours later and it was back to the top one flashing red and all other 3 (25/50/75%) a solid yellow. Any ideas?

Swap it to another lead and see if the light follows, that bank could be bad on the charger. Could also be the battery)

Great idea! Sometimes I scare myself with how dumb I can be!!

I did a little googling, the were a few comments that the fuse holder wasn’t making great contact. If you swap leads and the red lights still on, squeeze the yellow fuse holder together/tighter and see if that light changes color. Seemed to happen a bit.

Many thanks. I'll troubleshoot tomorrow and report back.

Just to be sure I called MK and they advised me to do exactly as you said so I did and sure enough the flashing light followed the lead so they said I have a bad lead or bank and to send it back. Sure do appreciate the help.