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Old 05-27-2011, 09:10 AM
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Location: Winnipeg Canada
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Question 1/2 spark

I have a 1974 115 Evinrude O/B ( CD-4 Ignition ) cyl 2 & 4 have great spark, cyl 1 & 3 have no spark ( erratic ) or at times spark for 6 to 8 time then stop for a long time. I switched coils and the same happens, I did a Sensor Coil Resistance Test - 7.8 to 8.0 ohms ( in range ) ,Charge Coil Resistance Test - 594 ohms ( in range ) . I do not have a S-80 or M80 Neon Light Tester, is there any other way to do a Sensor Coil Output Test, Charge Coil Output Test, Power Pack Output Test. I did replace the Power Pack last years, do you think it is gone once again. or is the problem else where. Thanks for you time.
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Old 05-27-2011, 09:16 AM
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just checking if this works OK
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Old 05-27-2011, 08:52 PM
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thats Ok everyone... got it going.. thanks for letting me post it here..
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Old 05-28-2011, 04:37 PM
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I didn't have an answer for you, but would like to know what you found.
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Old 05-28-2011, 06:41 PM
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with more testing I found that the Power Pack once again packed it in. seems every year at the beginning of the boat season I have to replace it.. don't know why but I do. now to figure out what is the next step so I don't have to get a new one next year...
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Old 05-28-2011, 07:15 PM
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What are the chances that the caps in the power pack take a spike when you first hook a battery up after setting all winter? I've worked a little with sensitive electronics and found that is you put a load in line (like a 12volt light) the power will build up slow and not damage the unit.
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Old 05-28-2011, 09:13 PM
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how can I put a low load on before I put a full 12 volts on it
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Old 05-29-2011, 04:24 PM
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Use an old taillight or similar and hook one wire to the positive of the battery and the other to the positive lead of the motor, once the bulb lights then hook the lead to the battery. This will cause the power to build up slower in the ignition pack. Might work/might not, I use this method on electric golf carts using a 100 watt bulb to load the motor control so as not to create a major arc.
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