2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 209Get this manual
Starting System: Starter Idle Gear Inspect the starter idle gear No.1 (1) and No.2 (2) for wear or damageIf any damage is found, replace it with new one2) Disconnect the handlebar switch coupler (1) (Yellow) 1I-12
I827H1180009-01
3) Measure the voltage between YG and lead wiresI827H1190034-02
Starter Button Inspection
Special tool0990025008 (Multi-circuit tester set) Tester knob indication Diode test) YG ((+) probe) (() probe) ON 0.4 0.6 1.4 and more OFF (Tester's battery voltage) NOTE If the tester reads 1.4 and below when the tester probes are not connected, replace its battery