Yanmar 1GM User Manual page 34

28
Ohmmeter
CHAPTER TWO
Ohmmeter
Solenoid
(S) terminal
Starter motor
Solenoid
(M) terminal
Starter
motor
the engine. Once the engine has started and the start
switch is released, the slave solenoid is de-energized.
Without current to hold the solenoid in position, the
starter motor overrunning clutch disengages the starter
pinion from the flywheel.
On-Boat Testing
Two of these procedures require a fully charged 12-volt
battery, to be used as a booster, and a pair of jumper ca-
bles. Use the jumper cables as outlined in Jump Starting,
Chapter Nine, following all of the precautions noted. Dis-
connect the wiring harness and leads at the rear of the al-
ternator before connecting a booster battery for these
tests. This will protect the alternator from possible dam-
age.
Slow running starter
I. Connect the 12-volt booster battery to the engine's bat-
tery with jumper cables. Listen to the starter running
speed as the engine is cranking. If the starter running
speed sounds normal, check the battery for loose or cor-
roded connections or a low charge. Clean and tighten the
connections as required. Recharge the battery if neces-
sary.
2. If starter running speed does not sound normal, clean
and tighten all starter solenoid connections and the battery
ground on the engine.
3. Repeat Step I. If the starter running speed is still too
slow, replace the starter.
Starter solenoid clicks, starter does not run
I. Clean and tighten all starter and solenoid connections.
Make sure the terminal eyelets are securely fastened to the
wire strands and are not corroded.
2. Remove the battery terminal clamps. Clean the clamps
and battery posts. Reinstall the clamps and tighten them
securely.
3. If the starter still does not run, connect the 12-volt
booster battery to the engine's battery with the jumper ca-
bles. If the starter still does not run, replace it.
Starter solenoid chatters (no click),
starter does not run
1. Check the S terminal wire connection at the starter so-
lenoid. Clean and tighten if necessary.
2. Disconnect the S terminal wire at the starter solenoid.
Connect a jumper wire between this terminal and the posi-
tive battery post.
3. Try starting the engine. If the engine starts, check the
key switch, starter switch and the system wiring for an