answersLogoWhite

0

You will need a digital multimeter that can measure DC voltage for an accurate reading. Open the hood and connect the positive and negative multimeter leads to the positive and negative battery posts. Turn on the multimeter and make note of the battery voltage you have before starting the engine. The battery needs to be fully charged to get an accurate alternator reading. A fully charged battery should read 12.68 volts. Assuming the battery is healthy and fully charged, start the engine and let it idle. Make note of the multimeter reading. A healthy alternator should read 14.2 Volts. Now with engine still running, turn on the headlights and turn on the heater blower on high. Multimeter reading should stay above 13.8 volts. If you are below these numbers you may have a tired alternator.

User Avatar

Wiki User

10y ago

What else can I help you with?

Trending Questions
How do you remove washer fluid tank and coolant over flow on 2003 safari mini van? Where is the fuel filter located on a 2003 Honda 750 Shadow? Why won't a 1993 Sentra automatic shift out of first on it's own The other gears all work fluids are fine and no slipping just won't shift? Can a 1999 dodge cummins engine run without the fuel pump? What brand of oil does a 2009 Aprilia SR 50 R take? How do you install a voltage regulator in an 1989 Chevrolet Beretta GT? How do you remove the lower arm spray on a maytag mdb4040 dishwasher? What is the problem if you smell a sweet chemical smell under the hood and in the AC vents of your 1996 Chevy pick up? How to disarm your car alarm after installing a new car battery? Why is it illegal to alter the odometer on a vehicle? What is the equivalent for other brands of oil filters for fleetguard LF9370? Why do the gauges on a 1984 Corvette stop working? How do you find a songs URL? Where is the fuse to the power outlet in a 2003 dodge srt-4? Does the car engine need to be running when i add transmission fluid? 94-98 Nissan UD 1400 Why won't it start I turn the key the gauge lights come on the headlights are dim and I just replaced one of the batteries. I had to jump it before the batt replacement.? How do you get rid of rust? Would antifreeze leak out if the thermostat housing wasn't tight? What kind of fuel does the 2010 Hyundai Santa-FE use? How do you get the instrument cluster on a ford bantam to work after a battery change?