A 12-volt, NO/NC, SPDT version like this one (Hella PN 007794301, $6.38 at Summit) can control both normally open and normally closed circuits, or it can act as a changeover device to switch ...

An electrical relay is a type of remote-control switch able to handle high-current accessories. Marlan Davis explains a 12-volt relay and how it works.

The Honda diesel engine has a 16:1 compression ratio, which makes it difficult to engineer a 12-volt stop-start system that is smooth and lightning fast. The Delphi system was nearly seamless.

Drop the pump in the water, connect the 12-volt power plug, and lock the hose into the ballast bag. Ballast can be added at 493 pounds per minute, according to specifications (61 gallons per minute).

I need to replace a noisy, vibrating 12 volt pump in a stand-alone, living room type fountain that's about 5' tall.<BR><BR>Something like an Eheim pump would be nice, but the 12 volts versions ...