Wiring diagram to solve problem on Mercury Outboard

[craige1982]

Hi all. I have a 40HP Mercury Outboard (approx 98 model) which I have just put on a boat with a Quicksilver control box, and I have a problem where it will start fine however it will not turn off when I turn the key off. The only way to stop it is pull the leads from the spark plug. There is a blk/yel wire which when connected will stop sparks getting to the plugs, howver this will prevent the sparks weather the key is on or off. Does anyone have a wiring diagram for the 40HP outboard, or the quicksilver control box? Any help would be greatly appreciated. Thanks

 

[cbcrawford]

Re: Wiring diagram to solve problem on Mercury Outboard

You should post this in mercs . . . but I'd avoid asking for the diagram, just ask for help. Some of the moderators (rightly) get upset when you ask for material that is obtained commercialy.<br /><br />First thing you should buy with any boat is a manual for the outboard, it'll have the diagrams for the controls in it.<br /><br />CC

 

[Pickels]

Re: Wiring diagram to solve problem on Mercury Outboard

Sounds like you have power to the boat 100% of the time - and the only thing your key switch is doing is engaging the starter.<br /><br />Easy to test this if your motor has a rope pull starter on it. When the motor is not running and with the key removed - pull the rope starter and see if it will run. If it does -- it will be simple to find out whether you have a defective switch (use a volt/ohm meter).

 

[joblo33]

Re: Wiring diagram to solve problem on Mercury Outboard

BTW, unplugging the plug wires while running will wreck your coils. Use the choke to kill it in that situation.<br />Eric

 

[TELMANMN]

Re: Wiring diagram to solve problem on Mercury Outboard

Here in the states I would go to a public library and get a schematic. I do not know if that is available down under. I have a 98 merc. book but it is up at my cabin and I will not be up there till next week.<br /> As previous post said, just choke it too quite or pull gas line.

 

[Moody Blue]

Re: Wiring diagram to solve problem on Mercury Outboard

Are you able to stop the motor using the kill switch ? If not, then the problem is likely that you have a bad ground in the kill circuit within the control box.

 

[JohnRuff]

Re: Wiring diagram to solve problem on Mercury Outboard

Did you find the answer?