firing problem

[jrbohannon]

I have a 1984 mercury 115hp L6 2 plugs will not fire I replaced coils but still does not fire. wiring harness was cut when i got boat. I repaired the harness and it ran great only time out. came back home and now I cannot get fire to 2 plugs. changed plugs also. any help will be greatly appreciated

 

[emckelvy]

Re: firing problem

Here's a very comprehensive troubleshooting guide from CDI Electronics:

CDI Electronics Practical Outboard Ignition Troubleshooting

The 6-cylinder ADI section starts on page 83.

If you need to take voltage readings you'll need to either make or purchase a DVA (Direct Voltage Adapter) for your meter. Search this section for numerous threads on how to build a DVA with inexpensive electrical/electronic components.

Here's a message thread and a diagram to start with:

http://forums.iboats.com/johnson-evinrude-outboards/need-dva-meter-make-adapter-5-a-434738.html

http://forums.iboats.com/mercury-mariner-outboards/dva-adapter-multimeter-427303.html

http://forums.iboats.com/attachment.php?attachmentid=43784&d=1264473219

Here's a link to a couple of DVA's you can buy:

Piercing Probe 511-9773-NL without Leads, DVA, Peak Voltage, Adapter - CDI Electronics 511-9773NL - iboats

ESI 640 Electronic Specialties 640 DVA Adapter

HTH.........ed

 

[JDusza]

Re: firing problem

+1 emckelvy.
Recommend purchasing a DVA. With it and cdi, you'll be an ignition expert within an hour. The cost of the dva ($25-$30) is nothing compared to the cost of misdiagnosis on $200 parts; stator, switchbox, trigger.
You can do it!
J