2003 Suzuki LT-Z400 Factory Service Manual, Page 248Get this manual
BATTERY CURRENT LEAKAGERemove the seat Turn the switch to the "OFF" position Disconnect the :lead wire Measure the current between battery terminal and the battery lead wire the multi circuit testerIf the reading exceeds the leakage is evident0990025008: Multi tester set ,20
Tester knob indication: Current current