No ignition 6 hp Johnson 1999

[Basio]

I have no ignition-sparks on my 6hp Johnson 2-stroke outboard engine from 1999, and I suspect a faulty HT coil: I can measure a voltage from both leads into the HT coil unit when I turn the engine, but nothing from the leads out to the spark plugs. So I suspect the dual HT coil is faulty. My reasoning is that there should be some voltage on the spark plug sides, even if the in-current to the coil is below specs, and therefore not enough to draw sparks on the plugs. So is it likely that the problem is due to a faulty HT-coil/ what else might be wrong? I have checked the overall wireing, also under the flywheel, and also checked for bad grounding. This all seems ok and in nice condition.

 

[AlTn]

Re: No ignition 6 hp Johnson 1999

well, it's cheap enough to replace to find out, esp. since you've measured voltage into it...try marineengine.com for diagrams and prices...if that doesn't return spark, try cdielectronics.com/troubleshooting to test further

 

[Basio]

Re: No ignition 6 hp Johnson 1999

well, it's cheap enough to replace to find out, esp. since you've measured voltage into it...try marineengine.com for diagrams and prices...if that doesn't return spark, try cdielectronics.com/troubleshooting to test further

Thanks for the advice. If I try voltage into it - would 12 volts be ok I wonder? (don't want to ruin the unit) I live in Denmark, Europe, so it is not as easy (or inexpensive) to get parts, as in the US, where the engine is born. Even though Jonson is also a well established brand overhere. It would be nice to have the problem nailed down well, before I start ordering parts. Kind regards

 

[Tim Frank]

Re: No ignition 6 hp Johnson 1999

Make sure that your STOP circuit is not part (or all) of the problem.
Check first that the clip has not been dislodged partially.
Then try disconnecting the STOP circuit wire.....if there is now spark, you need to troubleshoot that wiring.

 

[AEROCOOK]

Re: No ignition 6 hp Johnson 1999

Make sure that your STOP circuit is not part (or all) of the problem.
Check first that the clip has not been dislodged partially.
Then try disconnecting the STOP circuit wire.....if there is now spark, you need to troubleshoot that wiring.

X2... I had this problem on my 87 8hp and it was a resolved with a new stop switch. This is somthing that can be tested in less than 5 minutes.

 

[Basio]

Re: No ignition 6 hp Johnson 1999

Make sure that your STOP circuit is not part (or all) of the problem.
Check first that the clip has not been dislodged partially.
Then try disconnecting the STOP circuit wire.....if there is now spark, you need to troubleshoot that wiring.

I already checked the stop wire clip - its ok and in place. I also already tried disconnecting the stop curcuit by disengaging the black wire from the stop button (grounded at the top HT-coil screw) It does not seem to be here that the fault lies. I have also visually inspected all the wires quite minutely, and am pretty sure they are ok - thanks again - also for the links.

 

[Basio]

Re: No ignition 6 hp Johnson 1999

X2... I had this problem on my 87 8hp and it was a resolved with a new stop switch. This is somthing that can be tested in less than 5 minutes.

Thanks, I will give it an extra check.

 

[Basio]

Re: No ignition 6 hp Johnson 1999

I still have got no spark, even though I have tried out the suggestions and advice above. So now its time to start changing parts at random, I guess. Anyone got ideas where to start? What might be the 2 - 3 first parts to change in a situatuion like this - no spark at all?
My reading of voltage from the 2 in terminals to the HT-coil from wich the sparks plugs get their power is maybe neglible - only about 0.6 volts. Anyone know if that should result in sparks? I have not dared cranking up the power yet to the HT-coil, by means of an external power source - to see if this results in sparks - afraid of spoiling something. Thanks

 

[Tim Frank]

Re: No ignition 6 hp Johnson 1999

According to my manual, it is 1994 but probably still relevant....there are some fairly detailed, but somewhat complicated troubleshooting tests.
The only one that you do on the coils with them in place, is an ohmmeter test.
1) Remove spark plug lead and primary lead.
Calibrate ohmmeter on R x 1 scale. Connect neg lead of meter to a good ground, and positive to coil primary terminal.
Resistance should be 0.1 +/- 0.05 ohm

2) Calibrate ohmmeter on R x 100 scale. Connect neg lead of meter to a coil spark plug terminal, and positive to coil primary terminal.
Resistance should be 275 +/- 50 ohm

My advice is to get a manual....OEM are best....try ebay.
There is too much info to try and pass it along in this forum.
$30- will probably get you a manual including shipping. The first part that guess to throw at this will cost you that much AT LEAST.

 

[Basio]

Re: No ignition 6 hp Johnson 1999

I see your point. Also thanks for the specs for testing the coil.

 

[AlTn]

Re: No ignition 6 hp Johnson 1999

go to cdielectronics.com/troubleshooting....OMC.. Two Cylinder Engines....1977-2006...4-60 hp.....for some of the test you'll need a dva adapter for your multimeter < google it as well as how to make one if you'd rather do that >...marineengine.com has diagrams and ~ costs of the components you'll be testing..in essence you'll be testing power and triggering voltages into the power pack, then voltages out of the powerpack to the coil

 

[Basio]

Re: No ignition 6 hp Johnson 1999

Thanks - sounds like good advice.