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Kill switch with Mercruiser IO

Old 06-03-2018, 02:19 PM
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Default Kill switch with Mercruiser IO

I have a 7.4 liter Mercuriser with a "Open to Stop" kill switch. The kill switch switches all of the ignition circuit current and is protected with a 20 amp fuse.
The relay contact of the MOB unit are rated at 5 amps. This means I can't wire the MOB directly into the kill switch. Looks like I will have to add an external relay that is rated for as least 20 amps. Major pain in the ass as now I have to order a relay before I can complete my installation.
Are the relay contacts of the MOB rated to switch an inductive load like a relay coil?
Old 06-08-2018, 08:58 AM
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if it is a concern, you could go solid state relay

DC-Dc SSR DC-Dc SSR
Old 06-08-2018, 09:52 PM
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I needed something quick so I just went with an automotive relay and put a diode snubber across the coil. It's really too bad that they didn't put in a relay that works with the 10s of thousands of Mercuiser IOs and inboards that are out there.

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