You car has literally miles of electrical wire of all shapes, sizes and thicknesses, so it’s unsurprising that an electrical fault can be so irritating to find. Its fine if a bulb blows and by replacing it the bulb works, but if you replace the bulb and it doesn’t work, then that’s when disgruntlement can crawl in. A logical approach to the issue helps, which isn’t so easy to reach when you were just on the way out somewhere. It may also help to have a voltmeter in your auto, and a bit but suitably supplied toolkit ; you never can say when you might need them. There actually is only one strategy of identifying where an electrical fault lies and that is by employing a voltmeter. It tells you when there’s an electrical flow and when there’s not. This enables you to pin down where the problem is and with a little luck correct it. Even though you are unable to mend the problem yourself, it implies when you take your automobile to the garage you’ll save yourself money by having the facility to tell the expert where the fault is, rather than the specialist beginning from the start and charging you reasonably. Turn on your voltmeter and set it to read of approximately 6 to 14 volts ; vehicles operate using 12 volts. Start with the item that isn’t working.