Heaters that assist cold starting in diesel engines.

Glow plugs warm the combustion chamber so a cold diesel will start cleanly. Faulty plugs can cause hard starting, smoke on cold start or rough idle for the first few seconds. Match thread size, tip length, voltage and connector style. Always test the glow plug circuit and relay if several plugs fail together. Correct glow plugs help diesel engines start reliably on cold mornings.