Suzuki DL650K5 Service Manual page 619

DTC "48" (C1648): SUPPLY VOLTAGE (DECREASED)
POSSIBLE CAUSE
Faulty generator, faulty regulator/rectifier, faulty battery, faulty
wire harness, etc.
NOTE:
When the voltage resumes the normal level, the ABS indicator
light will go off.
Step 1
1) Turn the ignition switch to OFF.
2) Remove the seat. (!DL650K4 7-4)
3) Measure the voltage between the + and - battery terminals
using the multi-circuit tester.
$ Battery voltage: 12.0 V and more
# 09900-25008: Multi-circuit tester set
' Tester knob indication: Voltage (()
Is the voltage over 12 V?
YES Go to step 2.
NO Charge or replace the battery.
Step 2
1) Run the engine at 5 000 r/min with the dimmer switch set to
HI.
2) Measure the voltage between the + and - battery termi-
nals.
$ Regulated voltage: 14.0 – 15.5 V at 5 000 r/min
' Tester knob indication: Voltage (()
Is the voltage 14.0 – 15.5 V?
YES Go to step 3.
Inspect the generator and regulator/rectifier.
NO
(!DL650K4 8-10)
DL650K7/AK7 ('07-MODEL) 13-115