I have a Mariner Magnum 40 that I have replaced all the electronic components with exception of the strator to try and correct the issue of having NO fire through the coils and to the plug. I have tested or have had tested all conceivable components with no avail. One time it will start and then the next several attemps it will not start. Like stated above, I am getting NO fire at the plug. I have not replaced the strator but have all other electronic components on the side of the engine. I have had the engine in the shop and they can not seem to tell me what the issue is with said engine. Does anyone have an idea as to where I need to troubleshoot next?