Thanks for the reply. I did not mention that the mechanic said that the switch box had power in but no power out. I don't know if that makes a difference or if the mercury switch or bad trigger could cause that to happen. I look forward to your reply.
One other question I hope. I have the top and front Motor brace that houses the switch box, coil and rectifier off also I have the engine internal wire harness out. The harness is shot so it makes it impractical to test any components without the new harness. I would like to order all parts that I may need at one time. So as I mentioned in my first question if I replace the switch box and coil (they come as one unit from CDI) mercury switch and wire harness could the newly installed switch box get damaged if the trigger is bad. I'm assuming the trigger if bad is shorted out. I sure would like to avoid replacing the trigger as it make no sense at that point not to replace the rotor $200.00 plus and the timing belt $30.00 plus (labor $300.00 estimate from mechanic).Even though I'm a fairly good mechanic (cars) replacing the distributor on this engine is a job I would not want to tackle. The switch box original part #337-4411 CDI makes a replacement for that exact part. I added that info because as I'm sure you know Mercury had a few different ignitions for that same engine series and serial numbers.