In 12-volt automotive circuits, even small resistance amounts can cause significant voltage drop. Relays provide a solution by shortening the required length of the heavy-gauge, power-delivery ...

If it's not, turn the car off, swap the two wires ... See All 8 Photos The Right Way to Hook Up a Relay to 12 Volt Power While you might be tempted to just run the positive wire from your relay ...

"All the ECUs in the vehicle are powered from the low voltage, as well as the power relays that separate ... going with a 12-volt system for the car's computers and accessories makes sense.

The remaining components that make up a Prius hybrid engine system include a standard 12-volt car battery, a high-voltage hybrid EV battery, an inverter-converter, a computer system, relays ...

the old-fashioned 12-volt automobile electrical system has reached the end of the road. That’s the view of Mary Gustanski, Delphi Automotive’s vice president of engineering and program management.