1987 70HP Johnson no spark

[fisherrick]

Having a no spark problem on 87 Johnson J70TLCUR. Stator is a 582730. Powerpack is a 583143. Timer is a 582724. Between Seloc and CDI, I can not find a test procedure to match what I have. Don't have OMC manual on this engine.

I get low resistance of 10.8ohms between pin d-a, d-b and d-c on the timer. This is supposed to be 35-47 ohms. Yet the DVA is supposed to be .6v+. I'm getting 1.6V to 1.8V. Even with the low resistance reading, the dva is well above minimums. My guess is that the timer base is good.

Next step is to test stator between brown and brown/yellow and between orange and orange/black (according to CDI). I don't have orange or orange/black. I have standard brown & brown/yellow, and yellow & yellow/gray. However, resistance test on brown to brown/yellow shows open circuit and no dva output.

Wiring diagram shows connector with black/yellow (kill) on output side of pack with the 3 orange coil wires (no connector). Actual engine shows kill wire on connector with brown wires between stator and pack and orange coil wires directly out of pack w/o connector. Kill wire checks out as to short to ground, (key off), and open circuit, (key on) @ this connector, so key switch and dead man switch should be good. (tested control box on another engine..checked good).

I have been jumping the solenoid w/ key off or on. No Spark. Jumped solenoid with main Red Plug disconnected. No Spark. Can't test the pack until I'm sure the stator is bad. Of course, checked with everything hooked up w/no spark using key switch. Certainly don't want to just throw parts at it until it works. So....

1 Charge coil is part of the stator Yes/No?
2. Charge coil is test on two brown wires. Yes/No?
3. Charge coil bad, stator bad. Yes/No? (charge coil molded into stator)
4. Timer holds sensor coils only. Yes/No?
5. Checking the pack can not be done until the charge coil is putting out (good dva from charge coil to pack). Yes/No?
6. Charge coil should put out whether timer is connected or not. Yes/No?
7. Does anybody out there have a test procedure from OMC Manual? Hopefully the wiring diagram will match what I have.

 

[Bosunsmate]

Re: 1987 70HP Johnson no spark

1 yes 2 no thats the orange ones 3 stator open resistance means broken 4 yes 5 yes 6 charge to battery yes
Double check your stator open readings on the brown.

 

[emdsapmgr]

Re: 1987 70HP Johnson no spark

You may find your wiring diagram in the "TOP SECRET" files, at the top of this forum. The condemning voltage from the timer base is if the cranking output is under .6 volts. Sounds like yours is ok. Cranking voltage from the ignition side of the stator, using a "peak reading" voltmeter should be between 150-400 volts. Less than 150 volts-it's condemned.

 

[WernerF]

Re: 1987 70HP Johnson no spark

However, resistance test on brown to brown/yellow shows open circuit and no dva output.

This is your problem. If you measured correctly, the stator is bad. Should be about 500 Ohms and 150-400V peak.
The brown wires are the capacitor charge coil. The orange ones that you don't have came in 1989 for the SLOW feature (overtemp rpm limit at 2,500 rpm)

 

[Will Bark]

Re: 1987 70HP Johnson no spark

Before you go any further have had that battery load tested and are all battery connections clean and shiny bright? If that engine is not spinning 250/300 RPMS all bets are off since it takes that much to create spark. JMO

 

[fisherrick]

Re: 1987 70HP Johnson no spark

Thanks guys. Battery is good. Have plugs out and connected to spark tester so cranking speed is good. Yep! resistance shows zero and no DVA between brown and brown/yellow. Hate those darn Seloc's. THANKS AGAIN.

 

[Bosunsmate]

Re: 1987 70HP Johnson no spark

Sounds like stator is bad, you may get lucky and find out that a wire has perished between the plug and the epoxy stator base. Sometimes they chaff when the timing base wires turn with them and thats where the open circuit is.