Mercury 75 Service Manual page 69

CAPACITOR DISCHARGE MODULE
IMPORTANT: Spark plug wires are screwed into CDM.
a - Ground
b - Black/Yellow
c - Trigger Connection
d - Stator Connection
A resistance check is required and can be performed on the CDM as follows:
NOTE: This test can be performed using the test harness (P/N 84-825207A2). Do Not connect the test harness
plug to the stator/trigger engine wire harness.
Connect Negative
Circuit Test
Stop Diode
Green test harness
Forward Bias
Black/Yellow (B)/ or
Stop Diode
Reverse Bias
Return Ground
Path Diode, Green test harness
Reverse Bias
Return Ground Ground Pin (A)/ or
Path Diode, Black test harness
Forward Bias
Ground Pin (A)/ or
CDM Trigger Input
Black test harness
Resistance
Ground Pin (A) or
Coil Secondary
Black test harness
Impedance
*Diode Readings: Due to the differences in test meters, results other than specified may be obtained. In such
a case, reverse meter leads and re-test. If test results then read as specified CDM is O.K. The diode measure-
ments above will be opposite if using a Fluke equivalent multimeter.
90-830234R3 DECEMBER 1997
CAPACITOR DISCHARGE MODULE
Connect Positive
(–)
Meter Lead To: Meter Lead To:
Green (D)/ or Black/Yellow (B)/ or
Black/Yellow test
lead harness lead
Green (D)/ or
Black/Yellow test Green test harness
harness lead
Green (D)/ or Ground Pin (A) or
Black test harness
lead
Green (D)/ or
Green test harness
lead
White (C)/ or White
test harness lead
lead
(At Spark Plug
lead
(+)
R x 100
Diode Reading*
R x 100
Diode Reading*
lead
R x 100
Diode Reading*
lead
R x 100
Diode Reading*
lead
R x 100
Spark Plug
Terminal
R x 100
Boot)
A B C D
Ohms
Results:
Scale
Continuity
No Continuity
No Continuity
Continuity
1000 - 1250
Ohms
900 - 1200 Ohms
ELECTRICAL - 2A-31