Why Need to Replace Glow Plug Wiring Harness? The glow plug wiring harness will be aging, cracking, rusty connector etc. after long-term use, which will cause wire couldn't use normally. We recommend you to check and replace harness when occur cold start issues or a check engine light. Why choose our's? Adopting durable materials and pure copper cable, to bear high and low temperatures, wear-resistant and corrosion-resistant, not easy deform. Meet original performance, with rubber seal attached on terminal, prolong it's service life. Notice This is non-OEM product, accessory only. Please check relevant operation video by search when you replace it in doubt.