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From: "Sergey Alyoshin (alyoshin DOT s AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Mon, 14 Aug 2017 13:22:14 +0300
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Subject: Re: [geda-user] Mechanical relay using mosfets?
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On Sun, Aug 13, 2017 at 4:12 PM, Rob Butts (r DOT butts2 AT gmail DOT com) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> I have a trolling motor (without schematics) that has 4 wires (black,
> yellow, red and white) to the motor windings powering the propeller.  Here
> is the power table (+ & - are the 12V battery posts:
>
> I was thinking of using high current mosfets as the relays however since I'm
> connecting in some cases one motor wire (red) to another motor wire (white)
> how do I operate the gate? Can I use a 5V micro?

Yes with something like FAN3268 (TTL input, +12 for MOSFET gates).
Also check if +12V is sufficient as MOSFET gate voltage for desired
30A drain current.