Aftermarket Glow plug controller relay brand names include Duralast, Delphi and Kaehler Automotive Equipment, as of 2015. Relay brands used by automotive manufacturers include Ford Motorcraft and Bosch.
Duralast products are original equipment replacement parts manufactured by Wells Vehicle Electronics to fit most major automotive brands. Delphi manufactures aftermarket parts for Ford, Nissan, Audi and General Motors cars and trucks. Kaehler Automotive Equipment is located in Germany and manufactures system relays for fuel pumps, wipers and glow plugs.
Motorcraft manufactures factory and aftermarket parts exclusively for Ford Motor Company. Bosch makes factory parts for multiple automotive manufacturers in North America, Europe and Asia.