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Yamaha 4 stroke 9.9 ignition harness diagram needed

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Created by Jethrow 2 months ago, 16 Jul 2021
Jethrow
NSW, 1042 posts
16 Jul 2021 6:17PM
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Hi All

Last weekend I went out to the boat and the motor was totally dead, not even a click when I turned the key. I know it wasn't the battery as I had the stereo going and the voltmeter was showing plenty of volts (with solar panel connected).

Anyway, I looked at all the bits I could and found a broken connection of the red wire in the ignition harness. Cool, I'd found the problem.

I took it home and cut out all the old connections and re-did them with Duraseal joiners. I'm pretty sure I matched all the wires up correctly.

I took it back out to the boat today, plugged it in and gave it a burl. The starter motor turns over with good force but no ignition.

I've searched to no avail for a wiring diagram for the harness but I guess they use a 10 pin now.

The pictures below are just showing the normal wiring harness for a side-mount Yamaha control but removed and separated from the side-mount.

Any Yammie geniuses out there? I set the key on and tried all the pin combos but couldn't find a closed circuit between pins. I just want to be able to test the circuits to see which one id a bad connection.

Thanks in advance...







r13
NSW, 845 posts
16 Jul 2021 6:43PM
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I used to have one of these - superb outboards. Have the FT9.9 2cmh "2009 Rigging Guide Manual" in pdf at 8Mb, 226 pages. Has a lot of wiring diagrams but not sure if it has the one you need. Got it off the web but can't find the link at the moment. If you want to PM me and include email which can received this file I will send it. regards Rob

Jethrow
NSW, 1042 posts
16 Jul 2021 6:50PM
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Thanks Rod. I downloaded the user manual but it didn't have the info I was after. I'll PM you...

Jethrow
NSW, 1042 posts
17 Jul 2021 3:56PM
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Thanks, that info was good Rob.
I also found this, which combined with what you sent, should tell me which pins should be a circuit for each key position...



r13
NSW, 845 posts
17 Jul 2021 4:17PM
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Greato. Hopefully the wind tomorrow afternoon is 15kts or less so we can get out to our boats.................

crustysailor
VIC, 804 posts
17 Jul 2021 9:11PM
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looks like you may be sorted now Jethrow, but just in case, here's a copy of another that I had.
Just incase, did you check the oil level, theres a low oil pressure safety, am I thought there was also in greay start protection as well...?
Both would stop an other wise healthy engine from starting.



Jethrow
NSW, 1042 posts
20 Aug 2021 10:55AM
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Thanks for the help all.

Just as a quick update, I was able to rejoin the ignition to the cable using the information above and I've now had two short motors around the bay.

All seems well!



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"Yamaha 4 stroke 9.9 ignition harness diagram needed" started by Jethrow