2005 PLSOR cuts after starting

[Harkonnen]

More problems with J115PLSOR 2-stroke.

Starts fine, but the moment I release the starter switch, it dies immediately. What gives?

What I know so far:

Not the ignition switch — same behavior even when bypassed completely.
Not the kill circuit — checks out fine.
Not fuel-related — it dies cleanly, and the dashboard resets at the same moment as if the ignition had been switched off and back on.

At this point, I am thinking there is a brief power loss when the starter circuit turns off, just long enough to kill the motor and reboot the dash. Any ideas on how to troubleshoot that would be appreciated.

Thanks!

 

[Crosbyman]

deleted

 

[Chris1956]

Some of the powerpacks used on Johnnyrudes use battery voltage when cranking, like my J150EXECD. When the starter stops, the battery power to the powerpack stops as well. During running, the powerpack is powered by the stator only.

A wiring diagram for your motor should tell if you have this feature.

 

[racerone]

Test the stator.

 

[Crosbyman]

if starter checks out ok see chat GPT for possible options to investigate
just ask why it stops after cranking.

 

[racerone]

Test stator ohms.

 

[Harkonnen]

Some of the powerpacks used on Johnnyrudes use battery voltage when cranking, like my J150EXECD. When the starter stops, the battery power to the powerpack stops as well. During running, the powerpack is powered by the stator only.

A wiring diagram for your motor should tell if you have this feature.

Hm. Apparently there is only one fat cable from batt+ to the solenoid. From there, three red wires branch off — to trim, reg/rec, and the brains. I would expect the brains to remain energized regardless of what the engine is doing, unless there is some stator-dependent circuit I am overlooking.

ChatGPT sent me chasing ground gremlins. @racerone, I hope you are incorrect, but I am afraid you may be right: when the engine is firing at idle (and it will continue firing for as long as I keep the starter on - the starter disengages cleanly and seems to spin freely), system voltage sits around 11V. Either it is not supposed to charge at those RPMs, or something wonky is going on with the charging circuit.

I’ll check the stator ASAP, and if it checks out, I’ll keep digging.

Thanks!

 

[racerone]

I believe the stator provides energy to ignition once key is released from cranking position.-----Do some testing on the stator.----Electrical issues can be challenging to understand and trouble shoot at times.

 

[Harkonnen]

I believe the stator provides energy to ignition once key is released from cranking position.-----Do some testing on the stator.----Electrical issues can be challenging to understand and trouble shoot at times.

The mystery deepens. Stator coils are in specs per factory manual. I'll probably wait until oscilloscope gets here so I can detect what in the world happens to voltage and when.

 

[saltchuckmatt]

Reading through the thread here...am I missing something?

Have you unplugged the control box and jumped it at the motor? Kill circuit, wife overboard clip.

 

[saltchuckmatt]

I guess that's what you mean about bypass? I'm like AI....some wire somewhere.... corrosion.

 

[Harkonnen]

Have you unplugged the control box and jumped it at the motor? Kill circuit, wife overboard clip.

I did disconnect ignition switch and jumped R/Pu, Pu, and Y/R directly. Checked B/Y (kill) for ground shorts Not sure what jumping at motor would tell me that I don't already know.

 

[saltchuckmatt]

I did disconnect ignition switch and jumped R/Pu, Pu, and Y/R directly. Checked B/Y (kill) for ground shorts Not sure what jumping at motor would tell me that I don't already know.

1st thing you do with an electrical issue on a remote start outboard.

 

[Chris1956]

On my Johnny 150, the yellow/red wire from the primary starter solenoid terminal runs to the ign keyswitch and the powerpack. If provides voltage to the powerpack, when the motor is cranking.

 

[Harkonnen]

On my Johnny 150, the yellow/red wire from the primary starter solenoid terminal runs to the ign keyswitch and the powerpack. If provides voltage to the powerpack, when the motor is cranking.

This is interesting. R/Pu+Pu - ignition and power to dash. R/Pu+Y/R - crank. Is powerpack really feeding off Y/R while cranking, and how - because on this model Y/R ends at starter solenoid?

 

[Crosbyman]

Chat had several options... here is one... fwiw....

​

5. Primer/choke masking lean condition​

During cranking, the primer enriches fuel mixture.

If carbs are badly clogged, engine may only run on primer fuel while cranking.

More likely if:

• engine only fires with choke/primer
• sneezes or coughs
• sat for long time

 

[Chris1956]

This is interesting. R/Pu+Pu - ignition and power to dash. R/Pu+Y/R - crank. Is powerpack really feeding off Y/R while cranking, and how - because on this model Y/R ends at starter solenoid?

Gee, see if the powerpack has the yellow/red wire from the starter solenoid feeding it with power. A wiring diagram will show it clearly, if it exists.

 

[Harkonnen]

• engine only fires with choke/primer
• sneezes or coughs
• sat for long time

None of the above. I have other reasons to rule that out, too. Willing to bet a case of beer it is electrical.

 

[Crosbyman]

if so why not add a direct B+ supply to the suspect part as a test or monitor it with a test lamp or vom to see whatahappens when you release the starter cct.

 

[Harkonnen]

Gee, see if the powerpack has the yellow/red wire from the starter solenoid feeding it with power. A wiring diagram will show it clearly, if it exists.

Nope. Not on the powerpack, not on the diagram. Y/R starts at ignition switch, runs to shift interlock and then aft to solenoid. Nothing else is connected to it as far as I can see.