Indmar Marine Ignition Coil – GM 1995 & Later | Part #556132 Restore strong reliable spark with this genuine Indmar ignition coil for GM-based Indmar marine engines 1995 and later. The ignition coil converts battery voltage into the high voltage spark energy needed to fire each cylinder — a failing coil means weak spark, misfires, and eventually a no-start condition on the water. Compatible with: Indmar GM marine engines 1995 and later fitted to Malibu, Moomba, Supra, and Tige boats.