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Looks like it might possibly be an OMC trolling motor that has been adapted for some reason. OMC trolling motors have a solid aluminum mount on one end that is thick enough to be the end hooked to the front of the gearcase. Now the problem with that assumption is the other end would have a hole in it sticking forward where the trolling motor propshaft would normally stick out. Slim60, is that plugged up somehow? The armature and brush holder look OMC. Of course it can’t work full of oil and water. Slim60, does the outside body of the motor seem to have a place where a skeg has been ground off the motor body. It was a steel skeg, about an 1/8" thick welded on. The yellow wire should run the length of the motor to the brush holder which is to the front. Again I have no idea what the apparatus was being used for. If there was a way to dis-engage the powerhead, it would make a quite trolling motor steered from the transom, but not sure how the powerhead would be de-coupled. Beats me! Looks like some work went into it.
Dan in TN