141
ELECTRICAL AND IGNITION
IGNITION COIL TESTS
6
IGNITION COIL TESTS
Primary Winding Resistance Test
Connect ohmmeter between coil primary terminal
and clean engine ground.
IMPORTANT: A reading of less than 2 ohms is
acceptable. Make sure meter is calibrated to read
1 ohm or less.
Secondary Winding Resistance
Test
Connect ohmmeter between coil secondary termi-
nal and coil primary terminal.
STATOR TESTS
The stator consists of 3 windings (6 poles each)
on a 7 inch diameter core and generates an out-
put voltage of 55 VAC (1700 watts maximum).
This voltage is converted by the EMM and used to
provide 12 VDC for battery charging (10 A at 500
RPM and 50 A from 2000 RPM to WOT) and 55
VDC for fuel injector, fuel and oil pump operation.
The ignition module of EMM is also powered by
the 55 VDC output.
Stator Resistance Tests
Disconnect the battery cables at the battery. Use
an ohmmeter to check resistance of stator wind-
ings.
STEP 1
Disconnect EMM J2 connector from EMM.
Calibrate ohmmeter to appropriate scale and con-
nect meter leads to the following pins:
• Yellow/white and yellow (pins 17 and 7)
• Brown/white and brown (pins 28 and 8)
• Orange/white and orange (pins 18 and 10)
IMPORTANT: A reading of less than 2 ohms is
acceptable. Make sure meter is calibrated to read
1 ohm or less.
Ignition Coil Primary Resistance
0.090 ± .005 Ω @ 77°F (25°C)
000741
Ignition Coil Secondary Resistance
301 ± 14 Ω @ 77°F (25°C)
000742
1. EMM J2 Connector 005434
Stator Winding Resistance Specification
Yellow & Yellow / white
.512 ± .020 Ω @ 73°F (23°C)
Brown & Brown / white
.512 ± .020 Ω @ 73°F (23°C)
Orange & Orange / white
.512 ± .020 Ω @ 73°F (23°C)
1
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