Solenoid | Sierra 18-5836 Sierra Solenoid | 18-5836 12V isolated base starter solenoid and tilt & trim solenoid for many Mercury and Mercruiser applications. Isolated base 12 volt 4 terminal posts Replaces Mercury 25661T1, 256611, 25661 Replaces Onan 307-1617 Replaces Mallory 9-15103