CDI 173-1225 Installation And Troubleshooting Manual

This unit replaces P/N's: 581046, 581225, and 763772.
Warning! This product is designed to be installed by a professional marine mechanic. CDI Electronics cannot be held liable for
injury or damage resulting from improper installation, abuse, neglect, or misuse of this product.
1. Disconnect the Negative battery cable.
2. Remove the flywheel according to the service manual for your engine.
3. Disconnect the original Stator wires.
4. Remove the original Stator and save the original bolts.
5. Install the new Stator using the original bolts with a good thread-locker applied to the bolts and tightened to the factory torque
specifications.
6. Connect the new Stator to the Power Pack.
7. Connect the new Stator to the Rectifier. Ignore any stripes on the Rectifier as the new Stator does not require the Yellow wires to be
connected to a particular Rectifier wire.
8. Replace the flywheel according to the service manual for your engine.
9. Clean all battery cable connections both on the battery and the engine.
10. Reconnect the Negative battery cable.
NO SPARK ON ANY CYLINDER:
1. Check the cranking RPM. A cranking speed of less than 250 RPM may not allow the system to spark properly. This can be caused by a
weak battery, dragging starter, bad battery cables, or a mechanical problem inside the engine.
2. Perform a visual inspection of all ground wire connections to make sure that they are clean and tight.
3. Disconnect the Black/Yellow stop wire from the Power Pack and retest. If the engine's ignition now has spark, the stop circuit has a
fault. Check the key switch, harness, and shift switch (if present).
4. Disconnect the Yellow wires from the Rectifier and retest. If the engine now sparks, replace the Rectifier.
5. Check the Stator and Timer Base resistance and DVA as given below:
Read from
Brown (Stator)
Brown (Stator)
White/Black (#1 Sensor)
Black/White (#2 Sensor)
Brown (Stator)
Brown/Yellow (Stator)
Black/White (all)
White/Black (all)
6. Check the DVA on the Black/Yellow kill wire on the screw terminal of the Power Pack. You should have a reading of at least 150 DVA
or more. The Stator and Timer Base should be connected to the Power Pack for this test. If you do not, check the DVA on the Stator
and Timer Base. If the DVA on the Stator and Timer Base is good but the DVA on the Black/Yellow Kill wire on the screw terminal of
the Power Pack is low, the Power Pack is likely faulty.
7. If equipped with an OEM Timer Base and the Timer Base DVA is low, you may try to reset the air gap between the Timer Base sensor
and the Timer Base magnet using a Sensor Gap Gauge or use the following procedure:
a) Loosen the two mounting screws and the nuts on the Timer Base Sensor located in the epoxy on the outside of the heat shield of
the Timer Base.
b) Slide the Timer Base sensor in toward the crankshaft until the sensor touches the stop boss located at the base of the sensor
mounting area. Tighten the mounting screws.
c) Coat the face of the sensors with machinists bluing or equivalent.
d) Install the flywheel without the woodruff key and rotate the flywheel at least one full turn.
e) Remove the flywheel and check to see if the Timer Base magnet struck the face of the sensors. If it did, back the sensor out
approximately 0.005" and repeat steps c, d, and e.
f) If the ignition now has spark, finger tight the nuts on the outside of the heat shield and coat them with RTV.
g) If still no spark, replace the Timer Base.
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Rev E • 5/18/2023
Installation and Troubleshooting Guide
This installation is to be completed by an Authorized Dealer or Professional Service
Technician. For questions regarding installation or warranty, call CDI Tech Support
at 866-423-4832. Do not return to the Dealer or Distributor where the part was purchased.
Contact CDI Electronics Directly for Return Material Authorization.
CDI P/N: 173-1225
TROUBLESHOOTING
Read to
Brown/Yellow (Stator)
Brown/Yellow (Stator)
Black/White (#3 sensor)
White/Black (#4 Sensor)
Engine Gnd
Engine Gnd
Engine Gnd
Engine Gnd
CDI Electronics, LLC • 353 James Record Road SW • Huntsville, AL 35824 USA
www.cdielectronics.com
INSTALLATION
OEM Ohms CDI Ohms
835-985 Ω (1973) 640-785 Ω
555-705 Ω (1974-77) 640-785 Ω
10-20 Ω
10-20 Ω
Open
Open
Open
Open
• Tech Support: 1-866-423-4832 • Order Parts: 1-800-467-3371
Page - 1 of 3
DVA (Connected)
150-400 V
150-400 V
35-55 Ω
0.6 V minimum
35-55 Ω
0.6 V minimum
Open 150-400 V
Open 150-400 V
Open 0.6 V minimum
Open 0.6 V minimum
DVA (Disconnected)
150-400 V
150-400 V
0.6 V minimum
0.6 V minimum
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QF-358