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Author Topic:   Johnson 90 wiring diagram
kingfish posted 06-25-2004 10:05 AM ET (US)   Profile for kingfish   Send Email to kingfish  
Does anybody out there have a wiring diagram for a circa 2001 90 HP Johnson (carbed, pre-mix) 2-stroke?

I blithely yanked that motor off the Montauk I'm working on last fall and I'm sorry to say I was unable last night to figure where and how the wiring harness hooks back up (red and black battery leads, triangular plug socket [found that one], and two square plug sockets, one male and one female that will fit together with each other, but I'm sure that is not the intended program.)

How embarasking!!

Any help would be appreciated.


kingfish posted 06-25-2004 03:58 PM ET (US)     Profile for kingfish  Send Email to kingfish     


Backlash posted 06-25-2004 04:20 PM ET (US)     Profile for Backlash  Send Email to Backlash     
Wish I could help you, but I can't. Just a tip...lately I've been taking photos (digital camera) of any complicated projects I start that require tear down and reassembly. Often I'll tear something down and not get back to it for a couple of months and, more often than not, have no idea where everything goes! A picture is worth a thousand words...
Good luck,
kingfish posted 06-25-2004 04:44 PM ET (US)     Profile for kingfish  Send Email to kingfish     

That would have been a great idea - funny thing is, I can distinctly remember looking at the connections as I took them apart and thinking that reconnecting was going to be so simple and straightforward that I didn't need to tag or record anything. Those thoughts should have been my first clue...

greyg8r posted 06-25-2004 09:21 PM ET (US)     Profile for greyg8r    
My Clymer manual for my OMC engine (sorry, it's for 1973 - 1990 engines) has wiring diagrams.

You may have to spring for a repair manual.


Chuck Tribolet posted 06-25-2004 09:55 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
I've got the manual for the '97 equivalent motors. There's
a good chance inertia will have kept the code the same.

What's the color of the wires on the unidentified sockets?


gtcway posted 06-25-2004 10:07 PM ET (US)     Profile for gtcway  Send Email to gtcway     
I'll do the best I can at explaining.

The two square connectors should be connected to the engine wiring harness on the port side of the engine under a black cover held on by two screws. If the cover isn't there you should see them between the cylinder head and the starter.

The black battery cable should be attached to the engine block with a 3/8" hex bolt just behind the starter.

The red battery cable is attached to the rear post on the starter solenoid.

If you still have troube tomorrow post and I can take a picture of a Johnson 150 which will have the same connections.

kingfish posted 06-26-2004 09:17 AM ET (US)     Profile for kingfish  Send Email to kingfish     
Grayg8r & Chuck - Thanks for the response; as you will read below, gtcway nailed it for me.

Gtcway - Thank you very much, that was exactly what I needed. When I was initially trying to reconnect the harness the night before last, we were tired, it was nearly midnight, and my work light had just blown out so we were working with flashlights. We couldn't even see the black plastic cover; it looked like a part of the engine block.

In the daylight, the cover was obvious, and once I removed it, there were the two square plugs and the positive stud on the solenoid; it took only a very short inspection to find the negative stud on the block. I am back in business!!

Thanks again, and I hope I can return the favor-


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