1990 v-150 Mariner Charging issues and running on 3 cyls.

[burleygu]

Took my boat offshore yesterday, travelled around all morning up to 50klms off the coast with no dramas around lunch time came back around the inside of an island roughly 25klms away from the boat ramp and turned the motor off and had lunch after lunch started her up to head home and I had no power wouldn't rev and was missing like a *****. Turned it off then back on again and I was off ran fine for about 1klm. then started to miss run rough etc only getting about 8klms P/hr at half throttle. Ran like that for 10 minutes then dropped it back to idle and tried to accelerate again and I was off ran fine for around 8klms. Then it started missing again so I had to drop it back just above idle and travel the remaining 10+ klms home at 8klms/hr. Whilst motor was running fine for those short moments I put a multimeter on the battery and it was charging at 16.5 volts at the battery, Once I got home I put the motor on muffs and put my multimeter on the coil packs Left bank I was getting like 0.30 at each coil right hand bank I was getting 0.00 to 0.02, So I came on on just the left bank firing. What should I look at replacing? I have a Cdi stator here ready to go? And I will replace the switchboxes to Cdi units aswell along with a new rectifier. Do you think running the motor that far on 3cyls would of caused any other damage? Should I look at the voltage regulator also?
Cheers guys!

 

[sam am I]

Re: 1990 v-150 Mariner Charging issues and running on 3 cyls.

Appears to me that the 0.30 side (left bank) is the bank that is working? The resistance was higher on that side because those coils were warm due to working properly (resistance of copper is directly proportional to temperature). The manual states readings of 0.02 to 0.04 ohms, these must be cold readings and that's about what you're seeing on the right side......your cold/dead side. Follow a trouble shooting guide if you can...

I'd say your coils are all good though. But, 16.5 is too high, probably the regulator bad (think yours are regulator/rectifiers in one package?) or.....the stator's output (regulators input) is waaaaaaaaay high and it's exceeding the regulator's max input voltage and therefor the output is this 16.5VDC

Wondering though if the charging issue (16.5VDC) relates to your dead bank of plugs somehow......perhaps like some kind of stator/trigger wiring, enamel insulation meltdown, just guessing though at this point, should be fairly easy to trouble shoot though eh?

I don't think running on three cylinders would have damaged the engine/other cylinders, the dead ones should been sucking oil and lubed up, just dead in the flame department was all.

BTW and I thinks this doesn't violate board rules........To quote the merc manual

"Troubleshooting Tips
1. Intermittent, weak or no spark output at 2 spark
plugs (one plug from each bank of three cylinders)
usually is caused by a bad TRIGGER.
2. A SWITCH BOX can also cause 2 cylinders (1
each bank) to lose spark.
3. Intermittant, weak or no spark output at 3 spark
plugs (a complete bank of 3 cylinders) usually is
caused by a bad STATOR or SWITCH BOX.
4. An IDLE STABILIZER/ADVANCE MODULE can
also cause 3 cylinders on 1 bank to lose spark.
5. Intermittent, weak or no spark output at any one
spark plug (single cylinder) usually is a bad COIL
or SWITCH BOX.
6. Loss of spark to 1 cylinder could also be caused
by a loose or broken PRIMARY LEAD between
the switch box and ignition coil or a broken or
loose GROUND lead between the ignition coil
and engine ground."