MerCruiser 13, Service Manual

Page: 48 / 348

TROUBLESHOOTING - 1C- 11 90-816462 2-695
Ignition System Check(1 of 2)
SPARK
CHECK FUEL, SPARK PLUGS, ETC.
SEE “TROUBLESHOOTING.”
1
•
DISCONNECT 4 TERMINAL CONNECTOR
ON DISTRIBUTOR AND CHECK FOR
SPARK.
•
IF A TACHOMETER IS CONNECTED TO THE TACH TERMINAL, DISCONNECT IT
BEFORE PROCEEDING WITH THE TEST.
•
CHECK SPARK AT PLUG WIRE USING AN INDUCTIVE PICKUP TIMING LIGHT
WHILE CRANKING. A FLASHING LIGHT INDICATES SPARK. (IF NO SPARK ON FIRST
WIRE, CHECK SECOND WIRE.) A FEW SPARKS AND THEN NOTHING
IS CONSIDERED NO SPARK.
NO SPARK
•
CHECK FOR SPARK AT COIL WIRE WITH TIMING
LIGHT WHILE CRANKING. (LEAVE TIMING LIGHT
CONNECTED TO COIL WIRE FOR STEPS 3-6).
NO SPARK
•
DISCONNECT DISTRIBUTOR 2 TERMINAL “C/+”
CONNECTOR.
•
IGNITION SWITCH “ON,” ENGINE STOPPED.
•
CHECK VOLTS AT “+” AND “C” TERMINALS OF
, DISTRIBUTOR HARNESS CONNECTION.
1A
2
3
•
RECONNECT DISTRIBUTOR 2
TERMINAL CONNECTOR.
•
WITH IGNITION “ON,” CHECK VOLT-
AGE FROM TACH. TERMINAL TO
GROUND
BOTH TERMINALS 10
VOLTS OR MORE
CHECK FOR OPEN OR
GROUND IN CKT. FROM “C”
TERMINAL TO IGNITION
COIL. IF CKT IS OK, FAULT
IS IGNITION COIL OR CON-
NECTION.
UNDER 10 VOLTS
“C”TERMINAL ONLY
4
REPAIR OPEN TACH.
LEAD OR CONNEC-
TION AND REPEAT
TEST #4.
•
CONNECT TEST LIGHT FROM TACH.
TERMINAL TO GROUND.
•
CRANK ENGINE AND OBSERVE
LIGHT.
OVER 10 VOLTS
REPLACE MODULE AND
CHECK FOR SPARK
FROM COIL AS IN STEP 6.
UNDER 1 VOLT
1 TO 10 VOLTS
REPLACE
IGNITION
COIL.
NO
SPARK SPARK
SYSTEM
OK
NO SPARK
SPARK
REPAIR WIRE FROM
MODULE “+” TERMINAL
TO “B” TERMINAL OF
BLACK IGNITION COIL
CONNECTOR OR PRIMA-
RY CKT. TO IGNITION
SWITCH.
BOTH TERMINALS
UNDER 10 VOLTS
CHART CONTINUED
ON NEXT PAGE
a
b
INSPECT CAP FOR WATER,
CRACKS, ETC. IF OK,
REPLACE ROTOR.
SPARK
REPLACE MAGNETIC
SHAFT ASSEMBLY.