1969 115hp No Spark Questions

[MTUJeeper]

I've been running through the tests from the manual on my engine. I have 12V to pin 8/9 but when cranking, I get 6.6 volts off of pin 7. I bypassed the Ignition Safety Circuit with a jumper wire, as my tests showed it was bad (no voltage across it when wires hooked to pins 1-4 but 12v when not hooked up. Still only getting 6.6V. I'm even running dual batteries and pulled the plugs so it would turn over easier. The blue wire coming out of the power pack running to pin 5 (I think, I'm doing this from memory while at work) is only giving 3 or so volts while cranking. Sensor in distributor reads 5 ohms, which is within spec, and the reverse start safety is bypassed. It isn't grounding out either. Do you think I should spend the money to replace the starter or just go with a new power pack? I was going to run a load test on the starter by measuring amps while cranking, but the manual doesn't list what is acceptable. I don't have a neon light tester or peak voltage tester to run the other tests on the power pack. Also, if the stator is bad, will the power pack still fire off the battery since the Ignition Safety Circuit is bypassed? How do you test/what is the voltage that comes off the stator? This is my first boat that I've owned, and the only outboard I've worked on, but I'm pretty good with mechanics. Thanks!

Christian

 

[MTUJeeper]

Re: 1969 115hp No Spark Questions

Bump...thinking I will be replacing the starter, brushes are almost down to the wires, so its probably about time. Bump for anyone that can help. Thanks!

 

[jonesg]

Re: 1969 115hp No Spark Questions

I don't know the answer but I can help with the problem,

first state what the problem you are having is.

What are the symptoms, what is it doing or failing to do.?

A peak reading marine meter is about $80 on ebay.
http://cgi.ebay.com/ebaymotors/Mari...tZMotors_Automotive_Tools?hash=item439e6f69d2

 

[MTUJeeper]

Re: 1969 115hp No Spark Questions

Well it has no spark as stated in the subject. I'm mainly looking for advise on whether I should be concerned about the the starter drawing so much voltage and if that is somewhere I should start looking for problems, or jump to replacing the power pack. I need to know how is there anything special to do to test the stator, and what kind of amperage the starter should draw.

 

[jonesg]

Re: 1969 115hp No Spark Questions

Ok, before diving into the power pack elecs , charging or ignition ...

Is the problem slow cranking of the starter?
Have you removed and cleaned the battery cable terminals at both ends?
I use sandpaper to get the contact bright and shiny.

Try that first and crank it again, I believe you need 300rpm to generate spark.
after giving it a try feel the cable, is it hot at the battery posts or starter terminals?
Try jumper cables too.

If it isn't cranking high enough rpm to generate ignition and the battery cable is good...then take a closer look at the starter motor.

To read stator voltage numbers you need the peak meter or build a DVA adapter , only 3 parts in the darn thing from radio shack.
You can also buy the adapters for about $25.
But you may not need one yet, try the free stuff first.

 

[rockyrude]

Re: 1969 115hp No Spark Questions

On my 69 115hp there are two wires that go from the pulse pack up along the timing arm under the flywheel to the sensor. Due to age and the fact these wires are moving with the timing arm, the insulation had worn through shorting the sensor signal to the pulse pack. I replaced the wires and the spark came back.