ACDelco D503A Ignition Coil
Professional Ignition Modules and CoilsACDelco offers a full line of Professional Ignition System and Switch products that are ideal replacements for the worn equipment in all GM vehicles. With complete GM coverage and the peace of mind that comes with all ACDelco products, it's easy to give your vehicle the GM original equipment advantage.Get legendary ACDelco performance from your vehicle. Our Professional ignition modules and coils are the ideal replacement for the worn original equipment parts on many of today's most popular GM cars, trucks and SUVs. Many modules feature electronically welded lead connections and laser trimming. Coil laminations are corrosion-protected. Primary and secondary coil windings often have molded-plastic protection.