Fits For 2004-2005 Chevrolet GMC 2500HD 3500HD DURAMAX 6.6 LLY. Resistance values should be close or identical for all plugs. Check the module's connector harness for signs of overheating. If an incorrect glow plug is installed (resulting in differing resistance values), the current will double, potentially causing the original wiring harness to overheat and burn.
