78 Mercury 90hp 900 inline 6 No Spark

[CydneyS]

I have a 1978 Mercury 90hp 900 inline 6. I had it to hit on started fluid by spraying it into the carbs. I disconnected everything off the battery nothing was label. I connect the 2 main leads back to the battery that runs to the motor. I cant get spark now. Any ideals what it could be? I cant find anything out on how I could test the coil or the distributor.

 

[jimmbo]

Did it have spark before you disconnected everything? Starting Fluid is not a good thing to use on a 2 stroke. Ether is great at washing the oil off the bearings and cylinder walls.

 

[Chris1956]

The CDI Electronics web site has a troubleshooting procedure for your Battery-powered CDI ignition. It will test the switchbox, trigger and wiring, and assumes the coil is good, which is a good assumption.

 

[CydneyS]

Yes it would hit but not stay running bc carbs was bad. My fiancé than disconnected the battery. Connect to battery with a better battery couldn’t get any spark. I than go the next day and try again & was able to get it to hit again. Than day after tried and no spark yet again. Now it’s staying as no spark.

 

[CydneyS]

Also how do I get to the CDI electronics web site?

 

[jimmbo]

I just did a search for CDI electronics

http://www.cdielectronics.com/troubleshootingguide/

 

[merc850]

That sounds like a trigger problem; you should get that troubleshooting procedure from the CDI site.

 

[CydneyS]

I found the website. I’m going try troubleshooting it sometime today. I think it might possible be a bad ground or the trigger not sure yet tho. Thanks everyone for the help tho.

 

[CydneyS]

Does anyone know where can buy the internal wiring harness at? The part number is 37817.

 

[Chris1956]

When I last checked engine wiring harnesses were pretty easy to find on the web.Sierra makes them as do CDI and likely others. if you have the OEM part number, a simple search should turn up more sources than you need.