Solenoid 172869 PH375-0033

Function and technical context

The starter solenoid is the electromagnetic component responsible for closing the high-current electrical circuit between the battery and the starter motor, allowing the crankshaft to turn and the engine to start. It operates within the electric starting system of the outboard motor, acting as a power relay that receives the signal from the ignition switch and transmits the necessary energy to the starter motor. Reference 172869 / PH375-0033, with assembly number replaced by 0581528, is designed specifically for Johnson and Evinrude engines up to 235 HP, ensuring electrical and mechanical compatibility with installations of those engine families. A faulty solenoid prevents engine starting, leaving the vessel inoperative, so its correct operation is critical for safety and operability on the water.

When to replace this part?

The most common symptoms of starter solenoid failure are: a dry click when turning the key without the engine starting, complete lack of response on starting despite the battery being charged, or intermittent and inconsistent starts that worsen over time. It is recommended to inspect the solenoid at each seasonal service, especially on engines with many operating hours or that have been exposed to high humidity and salt spray environments, as corrosion on the terminals is a frequent cause of failure. Replacing the solenoid preventively at the first signs of trouble avoids being stranded at sea and reduces the risk of damaging the starter motor from repeated overloads.

Compatible Johnson/Evinrude Engines

Equivalent manufacturer references