The power pack (called ignition module for Mercury outboards) is the heart of the outboard motor ignition system. It controls the timing of ignition functions on all engine cylinders. The job of this component is to collect and hold a charge of electricity, also known as “capacitive discharge.”
When the power pack supplies a voltage of energy to the motor coils this triggers the spark plugs to fire. Without getting too technical, all of this electrical movement and firing has to happen at the right time and in the correct sequence for the motor to run.
In a sense, you could say the power pack is also the head of the outboard ignition system because of its complexity.
Simply put, without a charge, your boat won’t run.
Because power packs are a sealed unit, you can only replace them when they fail. They fail when there’s no spark. If you notice an intermittent charge, it might be a good idea to have a spare power pack onboard.
When the charge fails completely, you’re “dead on the water.’’
Most boaters replace their power pack with a Johnson Evinrude power pack. It’s popular because they own the market for outboard motors. CDI Electronics makes numerous power packs for multi-cylinder engines for Evinrude, Mercury and Yamaha outboards.
On multi-cylinder engines, there may be two or more power packs one for each bank of cylinders, so replacing them can get expensive.
The good news is you’ll find we have most of the common power packs in stock at one of our four warehouses, and usually at one of the lowest prices you can find online.
We offer the added benefit of giving you access to technical experts who can help diagnose your issue. Give us a call. You may not have to replace your power pack at all!
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