You need a reversing solenoid. They are pretty common and can be found in golf carts amongst other things. Here's an example: http://www.thetoolboxshop.com/dc66-11p-albright-12v-dc-motor-reversing-solenoid-contactor-continuous-80a-ip66-6962-p.asp
One of these will allow you to change direction simply by flicking a small switch that powers the solenoid coil. For best efficiency you should wire it so that ahead is with the solenoid coil de-energised, and astern is with the coil energised (assuming you spend more time going ahead than astern!).
Jeremy
--- In electricboats@yahoogroups.com, "affordableacadia" <affordableacadia@...> wrote:
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> Hi EB people
>
> I have built an 18 foot launch of my own design named Eleccentricity http://www.affordableacadia.com/2011/eleccentricity-launched/ and I have been stymied over reverse. Naturally, I should be asking how others have done it so here I am. It currently cannot go in reverse unless I shift the gears on the electrified outboard; a bother to do remotely. Obviously I could reverse polarity to the motor (PM Mars 0909)and this is how I would like to do it with solenoids or relays if I can find ones rated for 80 amps.
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> My main requirement is not to have an energized solenoid while in forward, and it seems most cheap 80-100 amp solenoids are normally-open (NO). System voltage is 36V but I have an isolated 12V source for the coil. This presents a problem in that most solenoids have a common ground (-) for the coil and load. I am assuming it would be dumb to connect the two negatives, or would it?
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