Resistance Tests - Mercury 40 Service Manual

NOTE: If voltage remains low after installing a new
trigger, replaced CDM.
ENGINE RUNNING AT IDLE
It is not necessary to perform this test if the voltage out-
put was tested in the previous step.
Stator Output Test
Positive Meter Negative
Lead (+) Meter Lead (–)
Connect to Connect to
Green Test Black Test Har-
Harness Lead ness Lead
If stator output is low, go to "Testing Stator Resis-
tance".
Trigger Output Test
Positive Meter Negative
Lead (+) Meter Lead (–)
White Test Black Test Har-
Harness Lead ness Lead
If reading is below specifications, replace trigger. If
reading is above specifications, check CDM.
NOTE: If voltage remains low after installing a new
trigger, replace CDM.
90-852572R1 JANUARY 1998

Resistance Tests

TRIGGER
A resistance test is not used on the trigger. Test trigger
as outlined under "Testing Voltage Output to CDM" -
"Trigger Output Test".
STATOR
1. Disconnect stator leads.
NOTE: Resistance varies greatly with temperature.
Measurements should be taken with an ambient tem-
perature range of 65 to 85 F.
Positive Meter
Connect to
White/Green
stator lead
Connect to
400 DVA
White/Green
Scale
stator lead
DVA
Connect to
Reading
Green/White
stator lead
200 - 350
IMPORTANT If all CDM stator output voltage is
low and stator resistance tests are within specifi-
cations, then each CDM (one at a time) must be
replaced with a CDM known to be good until sta-
tor output voltage returns to proper levels. This
20 DVA Scale
process of elimination will reveal a defective
CDM.
DVA
Reading
2 - 8 Volts
Stator Resistance Test
Negative
Lead (+) Meter Lead (–)
Connect to
Green/White
stator lead
Connect to en-
gine ground
Connect to en-
gine ground
RX1
R x 1 Ohms R x 1 Ohms
Scale
660-710
No continuity
No continuity
ELECTRICAL - 2A-21