Switch Box Mercury Mariner | CDI 114-6222 CDI Electronics Mercury Mariner Switch Box | 114-6222 High performance replacement ignition pack fits various 4 HP to 20 HP Mercury/Mariner 2 cylinder outboard engines. CDI Electronics outboard ignition pack Fits Mercury 4 HP model 40 engines from 1976 to 1980 with serial number range 5589202-5595531 Fits Mercury 7.5 HP model 75 engines from 1974 to 1986 with serial number range 3801458-A197111 Fits Mercury 9.8 HP model 110 engines from 1974 to 1985 with serial number range 3795659-6620196 Fits Mercury 20 HP engines from 1977-81 with serial number 4403787-5837436 CDI determines the most common causes of component failure and designs their replacements to be better than the original Replaces Mercury 339-5287, 339-6222A 1, 339-6222A 4, 339-6222A 6, 339-6222A 8, and 339-6222A 10 Replaces Sierra 18-5788 and 18-5789