Begin by connecting pin 85 of the relay to a clean ground point on the vehicle chassis or the negative terminal of the battery. Then connect pin 86 to the ignition switch wire — this is the wire that ...

There’s a problem with fuses. On the face of it, testing would seem to be a one-shot deal — exceed the rated current and see if it blows. But once you know the answer, the device is useless. If only ...

You hop in the car, turn the key or push the start button ... nothing. Or maybe one of your headlights goes out when you're driving at night on a highway. Maybe during a long road trip, your radio ...