On our 79 Carver 3326, we have dual stations, flybridge and salon controls, with twin 270 Crusaders. When we purchased the boat last year, I had intermittent issues with the ignition system not wanting to work both on startup and shut down. There is one master keyswitch at the lower helm which when turned on, powers two solenoids in the engine bay. These solenoids then distribute power to the helms and all other areas. At both the upper and lower helm, there is a three position toggle switch (one for each engine, upper and lower) which starts the engine and then kills the engine at shut down. I traced the starting/kill issue to a small plastic box which is located under the cover of the lower helm, accessed from the galley side of the helm. This box contains two electromagnetic "relays". These relays, when energized, send power to the engines allowing them to start/run. Upon shutdown, the magnet pulls the power from the engine circuit and shuts down the engine. I assume these relays are original and are now 37 years old and getting weak. I would like to replace these old electromagnetic relays with new automotive type relays but am confused on how this should be done, what relays to use, and the proper wiring for them. If anyone has dealt with this type system before and can lend a helping hand it would be greatly appreciated. We are about 5 weeks from putting the boat back in for the season and I would love to put this issue behind us. Thanks in advance.