The Jeep Commando front and rear turn signal bulb sizes include 198, 1156, and 199 specifications. Replacement chart data covers 1966 through 1973 production years with corresponding bulb size information.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034 bulb is the most consistently used type across the Jeep Commando's turn signal specifications, serving as both the front and rear turn signal bulb for the 1966-1968 model years.
The 1034 is a dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base. Its dual-filament design allows a single bulb to serve two lighting functions at different wattages.
The 1034 is classified as a variant of the 1157, meaning it shares the same base type and general construction but differs in one or more electrical characteristics from the standard 1157 specification.
The 1156 bulb appears across multiple model years in both front and rear positions, making it the second most frequently specified type in these listings. It is a single-filament bulb rated at 12V and 21W with a BA15s bayonet base.
The BA15s base on the 1156 is not interchangeable with the BAY15d base on the 1034. The BAY15d base has offset locating pins to prevent incorrect installation of a single-filament bulb in a dual-filament socket.
The 199 bulb shares the same BA15s bayonet base, 12V rating, and 21W output as the 1156 and is classified as a variant of it, though the two are not confirmed as interchangeable within these specifications.
The 198 is a T5 miniature wedge bulb rated at 12V and 2W, which places it in a significantly lower power class than all other bulb types listed. Its wedge base design requires no locking mechanism, as the socket itself holds the bulb in place.
The 1973 Jeep Commando is the only model year in these specifications where the 198 bulb is used in both the front and rear turn signal positions simultaneously.
The front and rear turn signal positions share the same bulb type for the 1966-1968 and 1973 model years, while the 1969-1972 years show differing bulb types between the two positions.
All four bulb types listed, the 198, 1156, 199, and 1034, conform to ANSI standards recognized in both the United States and Canada.