IGN switch for 80 h.p.merc#3428023

[Jim1752]

helping my tax lady with this thing.she bought it for grandson.all kinds of problems,but think I’m getting close.guy she bought it from put a late model control and adapter harness made for alternator driven ign system.after short bit of time,key sw.won’t shut off engine.I need the part # for a switch that will work,and hopefully with choke in ign switch like later models have.any help would be greatly appreciated. P.s,I am a retired Mercury outboard dealer 44 years in business. Thanks,jim