RD 19 wiring diagram

[wiscoboater]

Hi Guys,
Does anyone have a wiring diagram for a 57 RD 19? I have 2 black leads coming from under the mag plate. One goes to a switch on the power head ( what’s that for? ) the other is just hanging free and not connected to anything. There is also some type of mercury switch on the throttle gear at the base of the tiller arm ( What’s that for? ) The wires on the mercury switch are in disrepair as well. I’m trying to get this all wired up properly.

Thank you,
Wannabe

[RICHARD A. WHITE]

2 black wires are from the points to kill the motor, one will goto ignition switch and I think the other to the cutout, I will look for a diagram in a bit…If someone does not beat me to it

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[opposedtwin]

[wiscoboater]

This Motor has no battery hook up, starter, choke, nothing but a pull start. I can see the black coming out of the mag and going to the cutout, but mine has 2 blacks coming from the mag. Is the second a ground? There’s about 4 extra wires in that diagram this motor does not have. Does the mercury switch work as a cut out also? or does it complete the circuit.

[wiscoboater]

Ok, here’s what I’m asking. I have 2 heavy black wires coming from under the mag plate. one goes to this switch. What is this switch and what does it do?

The other black wire is not connected to anything. It’s just hanging free

Where should this wire be connected?
Down on the throttle gear there is a mercury switch

What does this switch do?
Again, this motor has no battery hookup, no electric starter. It is just a pull start, manual choke motor that was used with cable controls. With these wires not hooked up will the motor start and run? Or do these switches needed to be wired properly for the motor to run?

Another view of the mercury switch. Sorry, they all came out blurry.

[RICHARD A. WHITE]

Ok with no battery OR starter, the only thing is a kill switch….that is the mercury switch by the throttle, your last pic, it senses a runaway condition and the mercury makes an electrical connection grounding out one of the 2 cylinders preventing the motor from revving too high., … the other should be for a push in kill button…You will still have 2 wires to the kill button. Look under the carry handle, down below where you would tighten up the co-pilot, should be a round black rubber button, if not still should be a hole where one "should" be.

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[wiscoboater]

Ok. Could I just take the two black wires from under the mag and route them to a push to kill switch on the dash? The reason I am asking is I’m not sure if I disconnect the wire from switch in pic 1 it will still allow fuel/air flow. The hose going to it seems to be the air line from the fuel connector.

[wiscoboater]

I just looked her over again. I can see a knock out plug in the pan that was never knocked out. It’s on the front of the pan, right side looking at it from the front. Theres nothing there. No wires, kill switch, nothing.

[frankr]

OK, in the first place, that motor did not have a kill switch or ignition switch as it came from the factory. So somebody has added that second wire coming from the magneto. That’s good, if you want a kill switch because the wire is already there. To add a kill switch, simply extend that dangling black wire to one side of it and run another wire from the other side of the kill switch to the center post on the vacuum cut-out switch (the mystery thing in your picture). Leave the present wire on that center post and don’t mess with any other wires.

The vacuum cut-out switch senses when the engine is in run-away condition and cuts out the bottom cylinder till it slows back down. The mercury switch lets the vacuum switch do it’s job only at slow throttle settings. If it were allowed to do it at high throttle settings, it could cause a high speed miss. And yes they WILL go into run-away mode without the vacuum cut-out, and you won’t have any way of stopping it, short of taking a hammer to a spark plug.

[vintin]

I’m surprised to hear these motors go into run away mode. I’ve been running my 57 35hp johnson for two years now with it’s over rev disabled. Never had it over rev. Also my mercury switch had worn out wiring so it’s disabled, too. I’m also running with no kill switch! I’m not advising anyone to follow my lead………just get out of my way! 🙂

[Author]

Posts