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Magnetic switches

DIESEL engine, transmission and generator repair and maintenance discussion forum.
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mjmason1
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Magnetic switches

Postby mjmason1 » January 22nd, 2023, 10:02 pm

Does anyone know what these magnetic switches actually do. One of my port side ones are burnt.
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km1125
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Re: Magnetic switches

Postby km1125 » January 23rd, 2023, 9:23 am

What engines do you have?

Could they (or one of them) be for the glow plugs?
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Sgodfrey
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Re: Magnetic switches

Postby Sgodfrey » January 23rd, 2023, 12:51 pm

Looks like you have Cummins 6cta engines. Sbmar.com seaboard marine is the place to get help on the engines. They have the electrical diagram on their site.
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KyleR
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Re: Magnetic switches

Postby KyleR » February 21st, 2023, 8:01 pm

I'm guess you have three switches per engine? Two are for the aftercooler air heaters and one is for the main engine starter, if I remember correctly.

My aftercooler ones were burnt up also so I pulled the aftercooler heater fuse to disable the whole system - it looked like it was a fire waiting to happen! After running the boat for 6 months with no discernable difference, I removed the entire system (mag switches, wiring harness, etc) which just cleaned up the whole area of the engine a lot!

Now if you are up north and routinely run the boat in the winter, that heater definitely helps with starts! But an oil pan heater will do the same with a lot less wiring. Since we stay away from the cold I have found no impact removing the system.

As mentioned, a lot about this can be found on the SeaBoard Marine website which is where I found out about disabling/removing the system if it is unnecessary. YMMV. ;-)
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