I have a Johnson 130hp (J130PLSSS) motor, and I'm thinking the ignition switch is going bad. I'm having a hard time figuring out the replacement part number. Even on the Johnson parts website, which is impressive, I can't find the ignition switch in any of the diagrams. The switch in my boat looks very similar to OMC393301 (aka MP3976), but it isn't identical. Instead of having terminals A, B, C, S, M, and M like my current switch, the 393301 has I, B, C, S, M, and M. I'm guessing that A(ccessory) and I(gnition) are the same, but I'd like to know for sure.

Thanks very much for any help you can provide.