Sierra 18-99161 is a capacitor discharge module (CDM) for Mercury and Mariner outboards from 30 to 300 HP built from 1996 to 2007, and Force 40 to 120 HP outboards from 1996 to 1999. The module is marked CDI Electronics 114-7509 and replaces the Mercury 827509A series CDMs.
It comes with an attached spark plug lead. CDI notes the module is designed for installation by a professional marine mechanic; use the engine service manual for testing and wiring.
Confirm the part number on your old module, or your engine's model, horsepower and year, before you order.
Fits / Replaces
FitsMercury and Mariner 30 to 300 HP outboards1996 to 2007Force 40507590 and 120 HP outboards1996 to 1999
Is the Sierra 18-99161 the same part as CDI 114-7509?
Yes. The module is marked CDI Electronics 114-7509 and is supplied under Sierra part number 18-99161.
Which engines does it fit?
Mercury and Mariner outboards from 30 to 300 HP built from 1996 to 2007, plus Force 40, 50, 75, 90 and 120 HP outboards from 1996 to 1999. Confirm your engine's model and year before you order.
Which Mercury part numbers does it replace?
The Mercury 827509A series, including 827509A1, A3, A4, A7, A8, A9 and A10, and the 827509T4 and T7 versions. It also crosses to Mallory 9-23202.
Do I need a mechanic to install it?
CDI recommends installation by a professional marine mechanic. The engine service manual covers CDM testing and wiring.