12V Glow Plug Heater Perkins 1104C-44 / 1104C-44T 2666A016 2666A015

Hard starting when cold, longer crank time, rough idle for the first minute, white smoke at startup, or a glow plug / preheat fault (if your machine monitors it).

A common method is a resistance/continuity test using a multimeter between the glow plug terminal and ground. Very high resistance/open circuit usually indicates a failed glow plug.

Yes, this listing targets Perkins 1104C-44 / 1104C-44T when the installed glow plug cross-references to 2666A016 / 2666A015.

They are commonly listed as replacements/cross references depending on supplier and application. Best practice is to match your current part number first.

Let the engine cool, disconnect battery, remove the bus bar/wire, replace one plug at a time, and confirm the connector is tight and clean to avoid weak preheat performance.