2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 544Get this manual
LIGHTSMETERSSWITCHES
COMBINATION METERREAR VS SENSOR
POWERGROUND LINE INSPECTION
Rem ove the left nner fender (page 3-9)Rem ove th co binat io me ter 14P lGray) co nne clor ro he fr ame and isconnect it
Check the following at the ire harness side con-
nector POWER INPUT LIN E
M easure the voltage between lhl;! Blackblu wi re ter minal 1+1and ground (-) There sh ld be battery vctreqe wi the Ignition