To check if the lower shift cable is sticking and causing a problem in the circuit for the shift interrupter switch. Locate the shift interrupter switch located on top of the engine at the junction of the shift cables. This is most often on the left side of the engine as you would be looking at the engine facing the back of the boat. Once you have located the switch interrupter switch you can unhook one of the wires or unplug the connecting plug if it is so equipped that is attached to it. Start the engine in question and at idle speed while still moored put that engine into and out of reverse. If the engine still stalls then it is most likely a different problem if it does not stall then you most likely have found your problem.

Please do not operate your boat with the switch disabled as described above beyond the testing procedure because it can cause severe damage to the out drive.