I have an older motorguide 767 brute motor. It worked great for years then the last time I was out it died. It quit working after I changed the speed setting to get back to the dock. I thought the speed selector switch was the obvious problem so I replaced it and still nothing. After checking the other two switches on it (on off, power switch) everything looks fine but still nothing. I took a volt meter and tested the wires and it had 13 volts at the motor. This made me think the motor itself was bad, but I took the lower unit off and attached it directly to a battery and it ran! Any ideas?