Help with Tower/Power wiring harness

Scaaty

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Joined
May 31, 2004
Messages
5,180
Quick rundown. Building a 16' Flatbottom, 135 1973 6CYL Merc. Motor's at the builders, and don't want to bother him with niggling questions.
Switch/wiring in the box I have is corroded junk. I have an old Johnny switch/choke that I will run off the harness. Foot throttle, box only for shifting now. Neutral lock out won't be used. Only looking for what wires come from where, and what would go to what (simple question, huh?)
Need a ground, hot, start, and then run a hot to the choke and a ground. Motor will get separate kill switch wires, and the tach. Also will run new heavy gauge wires to the batt out the throttle opening to the batt for good solid grounds, so the harness cables are cut and taped off (junk anyway). Planning on this boat taking a lot of pounding, so I want everything secure as possible, with little to go wrong/rub/fall off. Heres a couple pix. Any help appreciated..thanks.

Wireedit2.jpg


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Scaaty

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May 31, 2004
Messages
5,180
Re: Help with Tower/Power wiring harness

OK, got the switch info off the Johnny Forum. Just need to know the function of the colored wires on this Merc harness.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,109
Re: Help with Tower/Power wiring harness

SCATTY, That motor has a battery ignition and distributor. The switchbox has a always "hot" wire (red), and an ignition wire (+12V when ign is on) (white). The brown wire is the Tach sender, the grey wire is for the choke solenoid. The starter solenoid is pink, I think. ground is black.

So you need a ignition switch that will connect battery power to the ignition, rather than one that grounds the ignition, like a kill switch.
 

Scaaty

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Joined
May 31, 2004
Messages
5,180
Re: Help with Tower/Power wiring harness

Thanks for that diagram TD, and Chris, thats exactly what I need to know (the grounding thing). I'll get it figured out. Still at Plan "A", and theres always Plan "B", and then 24 more letter plans yet! Thanks guys..
 
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