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Old 07 April 2016, 15:23   #21
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Could it be a problem with the kill cord wiring shorted somewhere?
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Old 07 April 2016, 15:23   #22
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Is it likely to be something more serious (e.g. CDI unit)
All I can say is that one of the three times I've been towed was due to a failed CDI/EMM on an Evinrude.
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Old 07 April 2016, 15:26   #23
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Could it be a problem with the kill cord wiring shorted somewhere?

I don't think so Fenlander, my outboard had an aftermarket kill switch fitted (which I'm not keen on) so I have removed it and re wired the original switch tonight

I'm unsure if the kill switch makes or breaks the circuit to test it
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Old 07 April 2016, 15:27   #24
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All I can say is that one of the three times I've been towed was due to a failed CDI/EMM on an Evinrude.

Sounds expensive 😳😳🙄
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Old 07 April 2016, 15:32   #25
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I'm unsure if the kill switch makes or breaks the circuit to test it
Try both - one won't work - one should?
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Old 07 April 2016, 15:33   #26
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Sounds expensive ������
Yeah. I thought the first one was expensive. The second one felt like a limb being amputated...
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Old 07 April 2016, 15:36   #27
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Try both - one won't work - one should?

I know how to remove (unearth)
The kill switch, do I just short it out with a piece of wire to check the other way?
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Old 07 April 2016, 16:04   #28
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I have just had had a quick look at the engine, it seems that fuel is getting through as engine is flooding after trying to start a few times. Removed spark plugs but can't find a spark on either plug/coil
How likely is it that both ignition coils have malfunctioned simultaneously?
Is it likely to be something more serious (e.g. CDI unit)
Whilst not impossible I would say it is unlikely, and unlucky if that is the fault. As soon as I read that I immediately thought it was much more likely to be an issue with the kill/stop circuit.

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Originally Posted by thestig1973 View Post
I don't think so Fenlander, my outboard had an aftermarket kill switch fitted (which I'm not keen on) so I have removed it and re wired the original switch tonight

I'm unsure if the kill switch makes or breaks the circuit to test it
The normal arrangement is that when you pull the cord the switch closes making a connection between ground and the kill wire (thus shorting out the spark circuit).

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I know how to remove (unearth)
The kill switch, do I just short it out with a piece of wire to check the other way?
You can do - but that should not solve the problem (unless there is something odd going on). It might be worth looking at a wiring diagram - other circuits can intentionally short the engine, e.g. the key turned to stop (on a remote - guess you don't have one - but do you have a wiring loom that a remote could connect to?), look for any other fraid or melted wires that might be shorting, check for any odd dangling wires.

I know on mine if you blow the master fuse nothing happens - I can't recall if that applies to pull start too...
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Old 07 April 2016, 16:14   #29
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Whilst not impossible I would say it is unlikely, and unlucky if that is the fault. As soon as I read that I immediately thought it was much more likely to be an issue with the kill/stop circuit.







The normal arrangement is that when you pull the cord the switch closes making a connection between ground and the kill wire (thus shorting out the spark circuit).







You can do - but that should not solve the problem (unless there is something odd going on). It might be worth looking at a wiring diagram - other circuits can intentionally short the engine, e.g. the key turned to stop (on a remote - guess you don't have one - but do you have a wiring loom that a remote could connect to?), look for any other fraid or melted wires that might be shorting, check for any odd dangling wires.



I know on mine if you blow the master fuse nothing happens - I can't recall if that applies to pull start too...

Good info, thanks poly 👍

I think my next step is to look for loose/frayed wires, and eliminate the kill switch

From the factory this outboard had a kill switch for the kill cord and also a kill switch on the tiller, a previous owner added an aftermarket switch too

Tonight I rewired the original switch, removed the aftermarket one however I still haven't ruled out the tiller kill switch

Also I need to find if I have a main fuse

I will be a happy man if it's just something simple 😀
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Old 07 April 2016, 16:34   #30
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I agree with Willk... and Poly.. ha ha.

The main ign unit could be at fault and failure will shut an engine down dead... but in general these units are exceptionally reliable across all small engines. If they do fail it is often due to an external cause that is coincidentally resolved when the replacement unit is fitted so the true cause went undetected.

With diagnostics the very first area I would double check is where there has been recent work... i.e. your stop wiring. Remember it's not just the switch to test but anywhere the black/yellow (90% sure this is your colour) power wire could be accidentally earthed (yes yours is earth to stop) might be the problem.

If you look at the service manual Boatinfo - Mercury Service Manual for 6-8-9,9-10-15 hp page 57 of 260 (or 2A-8) onwards gives the expected readings for the ign system that can be checked with a basic multimeter.

Note I know this manual covered my 2000-on Mariner/Mercury 15s but just check it applies to yours. If you find the wire colours mentioned above I'm guessing it will be the right info.
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