Honda BF40D Manual page 714

b. INSPECTION
• TACHOMETER/TRIM METER
1) Remove the valve from the tachometer or trim meter.
Replace the valve with a new one if it is blown.
2) Install the valve and check for continuity between the
Red/White terminal and the Black terminal.
Replace the tachometer or trim meter if there is no
continuity between the terminals.
• METER HARNESS A
Remove the wire band and remove the 10A fuse.
Replace the 10A fuse with a new one if it is blown.
18-28
R/W
Bl
[2]
10A FUSE
714
[1]
VALVE
[2]
METER
[1]
WIRE BAND