The 164 ML can display two different battery messages. If the warning is RED, it means the charging system is the problem. If the message is in WHITE, it means the back-up battery is the problem, along with some new software in the front SAM. A DC/DC converter will also have to be retro-fitted to increase the charging voltage of the new back-up battery.

There's an old Technical Bulletin that covers the whole thing. Have your indy check it out.