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Johnson/Evirude Alternator Driven CD Ignitions
1972-1978 Engines
(With screw terminal type power packs)
Four Cylinder Engines (continued)
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- Check the DVA voltage on each black/white wire to engine ground. You should have a reading of at least 150V or more (while connected to the pack). If the reading is low, disconnect the trigger wires from the pack and recheck the black/white terminals on the pack. If the voltage jumps up to an acceptable reading, the timer base may have a problem in the internal wiring (A thin spot in the insulation on one wire).
- Check the cranking RPM. A cranking speed of less than 250-RPM will not allow the system to fire properly.
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No fire or Intermittent on One Cylinder:
- Check the DVA output on the orange wires from the power pack while connected to the ignition coils. You should have a reading of at least 150V or more. If the reading is low on one cylinder, disconnect the orange wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack.
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No fire or Intermittent on One Bank:
- Check the timer bases resistance from the #1 sensor wire to the #3 sensor wire and from the #2 sensor wire to the #4 sensor wire. Reading should be 10-20 ohms on each set.
- Check the DVA output from the timer base. A reading of at least 0.5V or more from the #1 sensor wire to the #3 sensor wire and from the #2 sensor wire to the #4 sensor wire (while connected to the pack) is needed to fire the pack. If the output is low, you may try to reset the air gap between the timer base sensor and the triggering magnet using a sensor gap gauge or use the procedure outlined in #6 above.
- Check the DVA output on the orange wires from the power pack while connected to the ignition coils. You should have a reading of at least 150V or more. If the reading is low on one cylinder, disconnect the orange wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack.
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Six Cylinder Engines |
No fire at all:
- Note: If the engine fires with the spark plugs out but not with them installed, the timer base is likely weak or the engine is not spinning fast enough. See # 6 and #8.
- Disconnect the black yellow kill wire and retest. If the engines now has fire, the kill circuit has a fault-possibly the keyswitch, harness or shift switch.
- Disconnect the yellow wires from the stator to the rectifier and retest. If the engine fires, replace the rectifier.
- Check the stator resistance. You should read approximately 500 ohms from the brown wire to the brown/yellow wire.
- Check the DVA output from the stator. You should have a reading of at least 150V or more from the brown wire to the brown/yellow wire (while connected to the pack) on each bank.
- Check the timer bases resistance from the white wire to the blue, green and purple wires. Reading should be 10-20 ohms.
- Check the DVA output from the timer base. A reading of at least 0.5V or more from the white wire to the blue, green and purple wires (while connected to the pack) is needed to fire the pack.
- Check the DVA voltage on the white wire to engine ground. You should have a reading of at least 150V or more (while connected to the pack). If the reading is low, disconnect the trigger wires from the pack and recheck the white terminal on the pack. If the voltage jumps up to an acceptable reading, the timer base may have a problem in the internal wiring (A thin spot in the insulation on one wire).
- Check the cranking RPM. A cranking speed less than 250-RPM will not allow the system to fire properly.
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No fire or Intermittent on One Cylinder:
- Check the timer bases resistance from the white wire to the blue, green and purple wires. Reading should be 10-20 ohms.
- Check the DVA output from the timer base. A reading of at least 0.5V or more from the white wire to the blue, green and purple wires (while connected to the pack) is needed to fire the pack.
- Check the DVA output on the orange wires from the power pack while connected to the ignition coils. You should have a reading of at least 150V or more. If the reading is low on one cylinder, disconnect the orange wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack.
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