Westerbeke 20.0KW sbeg Operator's Manual page 51

PROBLEM
ELECTRICAL TROUBLESHOOTING CHART
The following lesl procedures will require lhe use of a mullimeler and Ihe
engine~
wiring diagram (in Ihis manual). Also refer 10 Ihe relay lesling
page. WESTERBEKE recommends lhat these lesls be performed by a
qualified technician.
CAUTION: When servicing or replacing DC
components, tum off the
20
amp
DC
circuit breaker.
TESTING INSPECTIONISOLUTION
(12 VDC is battery
+
vol/;Jge measured to ground)
Engine does not crank ...... .
Test for B+ (12v) at the circuit breaker to the PC
board terminal T4.
Check for bad connections at the engine harness
connector PI, Pin 1, the #14 red wire, or at the
battery + on the starter. Check the connections at
the PC board terminal 4 and at the circuit breaker
II OK •
Test for B+ (12v) at the circuit breaker to the panel
fuse end and to the PC board terminal
11.
If
OK •
Test for B+(I2v) from the fuse end to the PC board
terminal T2.
If
OK •
Test for B+(12v) at the crank relay Kl terminal 30.
If
OK •
Test for B+ (12v) at the start/stop switch terminals
2 and 10.
If
OK •
Test for B+ (12v) at the start switch terminal 1
when the switch is activated.
If OK •
Test for B+ (12v) at crank relay Kl. terminal 86.
If OK.
"OK.
Testlor B+(12v) at crank relay Kl terminal 85.
Activate the start switch and after a few seconds
the voltage should drop below .5 volts.
If OK.
Activate the start switch, after 4-5 seconds B+(12v)
should be present at terminal 87 on relay Kl.
II OK •
Look for a bad connection from the circuit breaker
to the fuse or at the PC board terminal T1.
Replace the circuit breaker.
Inspect the connections at the fuse or PC board
terminal T2. Replace the fuse.
Check for a bad connection at the engine harness
connector PI, pin #3. Check the DC voltage at
terminal #30 at the Kl, K2, K3 and K4 relays.
Look for bad connections at the panel connector
52, pin 1, whitelblack/red wire to the terminal
PC board or at the start/stop switch terminals 2
and 10.
Replace the start switch.
Check bus fuse (8 amp).
Inspect for a bad connection at relay Kl terminal 8
orange wire or at ECU connector J2, Pin #8
Look for a bad connection at relay Kl.
Activate the start switch, after 4-5 seconds check for Look for a bad connection at crank relay Kl,
B+(12v) at the start solenoid. terminal 85 orange wire or at the ECU
If OK • connector J2, pin #8.
Inspect the starter. Check the connections at crank relay Kl terminal
87, yellow/red wire or at the start solenoid.
~ WESTERBEKE
Engines & Generators
38