Need Key switch wiring for 1975 70HP Johnson motor....

datsunboy

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Joined
Nov 4, 2004
Messages
6
My friend and I just bought our first boat...but the keyswitch was in pieces, and all the wires were just hanging loose. Need to know how to wire it back up???<br />There is:<br />green wire - taped up, out of the loom?<br />black wire - attatched to ground<br />black wire - ?<br />black/yellow wire - ?<br />Red/blue wire - ?<br />brown - goes to one side of wierd round thing<br />purple wire - comes off other side of wierd round thing<br />purlple wire - comes off switch<br />purple/white wire - goes to switch from loom<br />and 2 white wires coming from the neutral switch - one into the loom, the other with a terminal on it <br /><br /><br />cheers for any help!
 

OBJ

Supreme Mariner
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Dec 27, 2002
Messages
10,161
Re: Need Key switch wiring for 1975 70HP Johnson motor....

Hello datsunboy and welcome to iboats!<br /><br />I had a 70hp a while back and did some drawings on it. Would be happy to share them with you. Drop me an email at outboardjim@comcast.net and I'll get them off to you. It'll be easier that way for you to understand what's what on the engine.
 

datsunboy

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Nov 4, 2004
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Re: Need Key switch wiring for 1975 70HP Johnson motor....

email sent....<br />cheers!
 

v12mac

Chief Petty Officer
Joined
Oct 30, 2003
Messages
502
Re: Need Key switch wiring for 1975 70HP Johnson motor....

I have to throw in the “duh” comment here. <br /><br />NOTE do not use an automotive style ignition switch. You must use an ignition switch that is designed for OMC outboard applications.<br /><br />Mac
 

datsunboy

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Nov 4, 2004
Messages
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Re: Need Key switch wiring for 1975 70HP Johnson motor....

I figured that after looking at the old switch
 

datsunboy

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Joined
Nov 4, 2004
Messages
6
Re: Need Key switch wiring for 1975 70HP Johnson motor....

ok...got it cranking e.t.c. from following the wires and touching them together....it's cranking...got fuel....but no spark...?<br />could be a dead power pack maybe???
 

jimalsk

Petty Officer 2nd Class
Joined
Jun 19, 2004
Messages
188
Re: Need Key switch wiring for 1975 70HP Johnson motor....

could also be one of your wires is grounding, acting as a kill switch
 

datsunboy

Cadet
Joined
Nov 4, 2004
Messages
6
Re: Need Key switch wiring for 1975 70HP Johnson motor....

pretty sure it's not a wire earthing....<br />Is it possible to be the power pack?<br />if coil was dead...then the other 2, would still atleast try to run it wouldn't it?
 

OBJ

Supreme Mariner
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Dec 27, 2002
Messages
10,161
Re: Need Key switch wiring for 1975 70HP Johnson motor....

Dan....tried three times to get those drawings to you but my email keeps getting kicked back at me. Your server OK on your end??
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Need Key switch wiring for 1975 70HP Johnson motor....

Red/Purple wire to Battery<br />Purple wire to Accessory<br />Black wire to one Magneto<br />Black/Yellow to the other Magneto<br />White to Start<br />Purple/White to Choke<br /><br />The first letter of the functions should be on the switch (like B for Battery). I hope this helps.
 

datsunboy

Cadet
Joined
Nov 4, 2004
Messages
6
Re: Need Key switch wiring for 1975 70HP Johnson motor....

yeah...I've been recieving other emails fine!<br />could you try once more? <br />cheers
 
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