I have a 1977 Mercury 20hp, Serial number 4580916. Well it started firing only one cylinder. When I got the cover off and began checking the switchbox I found a wire that had deteriorated and was almost broke in two. The switchbox is operational but these wires are the weak link. Is there a way, or a company that will rebuild these switchboxes?<br /><br />I checked on the price of a replacement and the cheapest I have found is around $250 shipped. Any leads, or help would be appreciated.<br /><br />Thanks,<br /><br />Ginder75