Yanmar F18D warning light query

[kenmac]

has something to do with your charging system .Loose wiring. bad alternator,etc,

 

[careyo63]

My bet it's a Loose wire. My 2000 was doing the same thing and found the loose connection on the Fuse Panel. . Esp. if it's charging. Alternators and Regulater's usually work or they don't.

 

[runningbird]

or a loose/bad belt.