السيناريو
A 12V automotive battery supplies a fused circuit. The hoist switch energises the relay coil, whose normally-open contact routes battery power to the hydraulic solenoid valve.
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01
Using a relay lets the low-current dash switch control the high-current solenoid coil.
02
A 1N4007 flyback diode across the relay coil suppresses inductive voltage spikes.
03
The solenoid valve returns to ground through a common 0V rail.
Use for 12V dump trailer, liftgate, or hydraulic power-pack controls where solenoid current exceeds safe switch ratings.