Johnson 150 V6 - 1999

[Lex]

Hi All,

I just got this engine in my hands and it has no tachometer and no charging power and it starts stange. Lets start with the first 2, I think the rectifier is down, is someone could confirm these thoughs that would be great, I measured the wires as the book says and it turns out to be true...

Then the starting;
it's morning or evening the engine hasnt run that day and I try to start, it cranks but doesnt start. After trying everything I dont get a spark on any plug. and then all of a sudden, bang and she runs as she just came out of the show room.

next morning same thing happens. I live in Bonaire, Dutch Antilles and there isnt any service here, exept me [ I do all outboards] but when I read the manual I see I need electric testing tools, which I dont have. i have heard the history seems dogie so now I want to solve the problem ones and or all. Can any body make sense from the above? Do I need tools to test them, where can I get them? is it the optical eye? powerpack? I am used to things either work or dont but this is weird to me.

please advise, many thx

Lex

 

[angus63]

Re: Johnson 150 V6 - 1999

Welcome
No tach or charge most likely is rectifier
Is the "dead man" clip on the control securely latched?
Might simply be a bad ignition switch.
A factory manual is essential when troublshooting the electronic side of latemodels. If you have a manual already, a simple volt/amp/ohm meter will suffice to verify all of the critical components.
You may have a simple loose connection that solves it all!!!!!
Good luck

 

[Lex]

Re: Johnson 150 V6 - 1999

Hi thanks for your reply, there is no deadman clip, the wires are cut. Thats my start of day check. but as it runs without one I assume thats not it. Then I also checked the in gear sensor/switch and that was faulty so I by past that, same thing happens, I can get it going after trying for half an hour.

I checked all wires and replaced battery cables, but nada.
If you would start testing components, where would you start? in which sequence? I hear the optical eye often gives problems?

THx
Lex

 

[Lex]

Re: Johnson 150 V6 - 1999

I have the manual and it refers to a testing tools, which I dont have.

 

[HighTrim]

Re: Johnson 150 V6 - 1999

An ohmmeter will get you going.

 

[angus63]

Re: Johnson 150 V6 - 1999

Since you know rectifier needs replacing , I would go stator then powerpack then coils just like the electrons travel. Pay special attention to connections since it runs good or not at all.

 

[Chris1956]

Re: Johnson 150 V6 - 1999

Lex, The ignition on that motor is on, unless the ignition switch grounds the powerpack. That kills the ignition. If you disconnect the ground (black wire) from the ignition switch, that will remove it from the circuit.

That motor has the shift assist switch that kills spark to 1/2 the cylinders. You have already disconnected that.

That motor has the SLOW system which kills spark to 1/2 the motor (Port side), if it thinks it is overheating. Disconnect the port side overheat sender on the head to remove that from the circuit.

Finally, That motor has a "push to prime" feature. The ignition switch should be pushed in to activate the primer (like a choke) when the motor is cold. The QuickStart feature (runs off the overheat sensor on the port head) will advance the timing to warm up the motor. It suould shut off after a minute, and the motor should return to normal idle speed (6-700 RPM).

Finally, that motor has a watercooled voltage regulator/rectifier combo. It is located at the top of the center of the two heads, behind the flywheel, under a plastic cover. The purple wire has the sensing voltage for the regulator, whenever the key is in the on position. The grey wire is the tach signal. The two yellow wires are AC voltage from the stator, which feeds AC Voltage to the rectifier, and is the same as the tach signal.

 

[Lex]

Re: Johnson 150 V6 - 1999

Chris and Angus, thx for your help.

Chris, I indeed found this through the book, except the disconnecting of the wires. The push switch doesnt exist on this boat. Maybe thats the bad history / experience of the engine. I will see if I can run through all the suggestions. I will keep you guys posted.

one more thing chris, the push to prime feature doesnt interfere with the spark/no spark does it?

cheers,

Lex

 

[Lex]

Re: Johnson 150 V6 - 1999

Hi Guys,

Do you know what a rectifier would cost? I am getting a quote here localy of approx 500$, seems very high.

THX

 

[Gary H NC]

Re: Johnson 150 V6 - 1999

Just looked on Ebasicpower....Not sure what one you have but about 160 was the highest...

 

[Lex]

Re: Johnson 150 V6 - 1999

HI Gary,

I thought it was high. I ill llok up part number and check the site you mentioned, do you have other sites which I could check out?

Cheers,
Lex

 

[Lex]

Re: Johnson 150 V6 - 1999

I am taking the boat out again today and I'll start stripping the electronics to test. Keep you posted.

Cheers,
Lex

 

[Chris1956]

Re: Johnson 150 V6 - 1999

Lex, Priming doesn't interfere with the spark, but lack of priming will make the engine hard to start when cold. ebasicpower had the best price for the voltage regulator, that I saw.

 

[Lex]

Re: Johnson 150 V6 - 1999

Hi Guys,

coils; measurement results, all the same, Primary 0.5 and the secondary 298. THe book tells me it should of been; 0.1 vs 275. either the tool is off or they are gone? My thinking says they cant be gone, because then she wouldnt run at all..

next the two sensors for overheating on the heads two different ones, both dont measure anything, even when I heat them up.

the book only tells me how to test the timing sensor with the analyser, which I dont have. Is there a other way to test this?

THX
Lex

 

[Lex]

Re: Johnson 150 V6 - 1999

Hi

parts search. I looked up the engine model number and came up with sj150wtpxt j04232402, but cant find this back on any site.

any tips how to continue? search on partnumber?

pfff we'll get it running!

Lex

 

[Lex]

Re: Johnson 150 V6 - 1999

Hi Guys, The engine turns out to be a 1996. I dont think much changed but please advise.

I need parts, any good sugestions would be great. I live in Bonaire, so anywhere in the states would be fine, I think Florida best.

findings to date, stator is not giving any power, indexing wheel has been properly damaged by so called mechanics that it is likely to fire whenever it feels like. two spark plugs where broken and the rectifier is dead [maybe because the stator is not giving any power?]

Cheers,
LEx