120 hp L drive no spark

[call-me-ishmael]

I have a 1990 bayliner with a Force 120 , L drive. the code is 120LD90C. I have been having electrical problems the last couple years and could never fix it. I couldn't find a mechanic to look it it, nobody wants to work on a Force. I got the boat for free so I decided to throw parts at it. I bought a new trigger, new stator, and 2 new CDI boxes for it. All CDI brand products. Put it all together, and I have no spark on #3 cylinder. switched coils and still no spark on #3. switched power packs, the blue boxes, and it made no difference. Could I have got a bad trigger ?

 

[pnwboat]

The CDI brand products are pretty reliable. It's possible the trigger could be bad, but all you need is a multi-meter and you can check the windings in the trigger. They should read 48 - 52 OHMs across each lead disconnected from the terminal block.

Based on past experience with the Prestolite ignition system, I would suspect something is not wired correctly. There's a lot of wires to connect to the terminal strip and it's really easy to get things wired wrong.

Also make sure there is a ground wire that runs from the CD Module/coil mounting plate to the engine block. If that ground wire is missing or not making good contact, it'll cause some strange problems.

 

[call-me-ishmael]

I will check and double check the wiring. And I was counting on the bolts that hold the mounting plate on to ground it, I will add an actual ground strap just to be sure. I wont to be able to do anything till monday, but will let let you know if I get it fixed, or not fixed,

 

[jerryjerry05]

Where you located?
You might be close to someone who can work on that motor.

 

[BlueFishCrisis]

Are your flywheel magnet(s) secure? Mine came loose and took out part of the stator. I noticed it when I went to re-install the flywheel. If you didn't notice, it could take out the new one as well.....