Flat Bracket Solenoid | Sierra 18-5816 Sierra Flat Bracket Solenoid | 18-5816 12V isolated base starter solenoid and tilt & trim solenoid for various Mercury and Mercruiser applications. Fits many Mercury and Mercruiser applications Isolated base 12 volt Flat bracket Replaces Mercury 89-96054T, 89-96054, 89-91975, 89-96054B Replaces Mallory 9-15113