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Relays or relay units are like breakers that you would have in your home to protect your electrical sytem. They are also used as switches to transfer power from the energy source in your vehicle to the component that needs to perform it's task, simply put, when you turn the key switch in your car a multitude of relays switch on to connect power to your ignition, fuel pump and many accessories. If your fuel pump relay goes bad, no fuel is delivered to the engine, vehicle doesn't go

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16y ago

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