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Mercury 115 continues to run with key off amp kill switch pulled

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Greg Henry

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"Hello, I've got a 2003 11

"Hello, I've got a 2003 115 Mercury outboard that continues to run with the ignition switch in the off position. The kill switch has no affect, as the motor runs with the switch toggled off. Also continues to run with battery cables disconnected. Could alternator be back feeding some how? Where do I start trouble shooting. Any ideas are appreciated. (Never thought I would have a problem making an outboard not run.)"
 
It does not need a battery to

It does not need a battery to run!!! In fact disconnecting the battery may / will damage the charging system.Get a manual or some help as expensive mistakes can be made.
 
"sounds like a bad stop diode

"sounds like a bad stop diode

find the black yellow wire coming out of the switch box on the motor

start motor, now touch the black/yellow to the motor, it should turn off

if not, you got a bad switch box"
 
Thanks for the help. I'll

Thanks for the help. I'll check this out. How much voltage should the charging system be putting out so that I can check to make sure I haven't fried it?
 
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