2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 292Get this manual
BATIERY ICHARGING SYSTEM 3Set the uTIMER" to the position indicated by the Honda Battery Tester; RED -3, RED -2 or YELLOW1If you are charging new battery, set the switch to the NEW BATT position 4Attach the clamps to the battery terminals: red to positive, black to negativeConnecrlng the cables wlrh rhe POWER sWlrdl fUmed to ON can produce spark whldl could Ignrte or explode rhe balrerv
NEW BATT
Connect the battery cables only when the "POWER" switch is turned to OFF
TIMER Trickle