Ayrton Oneill
A solenoid is part of a boat's starter. When activated, it transfers power from one side to the other. This is achieved by creating a magnetic field that moves parts inside the solenoid. A plunger inside the solenoid makes contact across two high amperage contacts inside it when it is actuated.
| Characteristics | Values |
|---|---|
| Function | Transfers power from one side to the other |
| Function | Moves an arm or something else |
| Components | Two large posts/terminals |
| Components | One or two small posts/terminals |
| Components | Plunger |
| Components | Two high amperage contacts |
| Components | Coil of wire with a shaft through the middle |
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What You'll Learn
The solenoid is part of the starter
A solenoid is a coil of wire with a shaft through the middle of it. When current is run through the coil, it creates an electromagnetic field that moves the shaft, which moves the throw out bearing on the starter against the gears on the flywheel.
There are two kinds of solenoids. The first kind, when activated, transfers power from one side to the other. An example would be an old starter solenoid or power trim. You hit the switch, it activates the solenoid, and power can flow to the starter or the trim motor. The second kind, when activated, moves an arm or something similar. An example would be a fuel shut-off solenoid or valve. You hit the switch, it activates the solenoid, and a valve opens or closes.
A Shift-solenoid starter, like those found in new cars, does both. You hit the switch, and the starter drive gear is pushed out, and power is transferred to spin the starter at the same time.
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The solenoid transfers power from one side to the other
A solenoid is a coil of wire with a shaft through the middle of it. When current is run through the coil, it creates an electromagnetic field that moves the shaft, which moves the throw out bearing on the starter against the gears on the flywheel. The solenoid doesn't care which way the current goes through it. When activated, a solenoid creates a magnetic field that moves parts inside it. The activation is power being supplied to the solenoid by a key switch, power trim, etc.
There is a plunger inside the solenoid that makes contact across two high-amperage contacts inside it when it is actuated. It takes very low amperage to actuate it while providing high amperage to something like a starter. Without a solenoid, the wires to the ignition switch and back to the starter would need to be the same size as the battery cables.
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The solenoid moves an arm or something else
Both kinds of solenoids work the same way but do two different things. When activated, they create a magnetic field that moves parts inside the solenoid. The activation is power being supplied to the solenoid by a key switch, power trim, etc. There is a plunger inside the solenoid that makes contact across two high-amperage contacts inside it when it is actuated. It takes very low amperage to actuate it while providing high amperage to something like a starter.
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The solenoid creates a magnetic field
The first kind of solenoid, when activated, transfers power from one side to the other. An example would be an old starter solenoid or power trim. You hit the switch, it activates the solenoid, and power can flow to the starter or the trim motor. The second kind, when activated, moves an arm or something. An example would be a fuel shut-off solenoid or valve. You hit the switch, it activates the solenoid, and a valve opens or closes. A Shift-solenoid starter, like on new cars, does both. You hit the switch, and the starter drive gear is pushed out, and power is transferred to spin the starter at the same time.
There is a plunger inside the solenoid that makes contact across two high-amperage contacts inside it when it is actuated. It takes very low amperage to actuate it while providing high amperage to something like a starter.
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The solenoid is a coil of wire with a shaft through the middle
A solenoid is a coil of wire with a shaft through the middle. When you run current through the coil, it creates an electromagnetic field that moves the shaft, which moves the throw out bearing on the starter against the gears on the flywheel. The solenoid doesn't care which way the current goes through it. There is nothing there to create a spark. It is inherently ignition protected and can't blow anything up.
The solenoid is part of the starter. A Bendix starter has a solenoid away from the starter and the force of the spinning starter moves the gear out. Most solenoids have two large posts/terminals and one or two small ones. A single small one is the activation power. When activated, the first kind of solenoid transfers power from one side to the other. An example would be an old starter solenoid or power trim. You hit the switch, it activates the solenoid and power can flow to the starter or the trim motor. The second kind, when activated, moves an arm or something. An example would be a fuel shut-off solenoid or valve. You hit the switch, it activates the solenoid and a valve opens or closes. A Shift-solenoid starter, like on new cars, does both. You hit the switch and the starter drive gear is pushed out and power is transferred to spin the starter at the same time.
There is a plunger inside the solenoid that makes contact across two high-amperage contacts inside it when it is actuated. It takes very low amperage to actuate it while providing high amperage to something like a starter. Without a solenoid, the wires to the ignition switch and back to the starter would need to be the same size as the battery cables. The ignition switch would need to have terminals on it the same size as the solenoid.
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Frequently asked questions
A solenoid is part of the starter. It is a coil of wire with a shaft through the middle of it.
When activated, a solenoid creates a magnetic field that moves parts inside it. This transfers power from one side to the other.
A solenoid moves an arm or something similar. For example, a fuel shut-off solenoid or valve.
Without a solenoid, the wires to the ignition switch and back to the starter would need to be the same size as the battery cables.
