"jamesgangnc" wrote in message
...
On Aug 2, 10:47 am, John H wrote:
On Thu, 29 Jul 2010 21:25:31 +0100, aslappy1

wrote:



I have a 98 bayliner with a 3.0 mercruiser had a problem on the water
the starter went. Had it towed fixed the starter and now it wont run. It
cranks and all but wont start. And the only plug that is firing good
enough to get across a plug is cyl 2. The others are getting enough
juice threw them to light a tester light but not strong enough to fire a
plug. My guess is its the ignition module and I have one on its way. any
ideas what it could be if that dosent fix the problem?

If there's a coil there, I'd check it out.
--

John H

He has weak spark. About the only check for weak spark that you can
do with a coil is to try another one. I'd still check for low voltage
at the ignition before anything else.

The ignition power on boats typically travels up to the helm from a
battery in the rear and then back to the ignition. Through multiple
friction fit connectors and fuse holders. I got tired of cleaning
connections on my 95 and installed one of those "ice cube" relays at
the engine. Now the keyed ignition line from the helm pulls the relay
which feeds 12 v to the engine on a much shorter path directly from
the battery with a 10amp circuit breaker on it.

And if it points ignition, the condensor bad will also make for a bad spark.