First be sure to have it on, And on the 12volt setting (if selectable) Be sure to get a good grounding point, I.E, door hinge, Seat bolt, Batt ground, Then just touch the other end (Red) to the point your testing volts. It should then give you your reading, Just be sure not to confuse the wires, Damage your testing unit or worse, Short cars wiring. Hope that helps!
Answer 2:
An ammeter needs to be connected in series with your circuit, (that is, all current must "check in" at the ammeter). Many ammeters are called multimeters because they are both ammeters (measuring current) and voltmeters (measuring voltage). many people make the mistake of setting the multimeter up such that it is reading voltage when they desire to read current.
When a voltmeter is hooked up in series with a circuit, the fuse within the voltmeter may break, sufficiently pissing off any lab instructor you may be working under.
amprobe
You can check it out yourself using these formulas. Watts = Amps x Volts. Voltage = Watts/Amps
To convert microamps to amps, you need to divide the value in microamps by 1,000,000. This is because one microamp is equal to one millionth of an amp. So, if you have a current of 500 μA (microamps), you would divide 500 by 1,000,000 to get 0.0005 amps.
How many Amps is the fridge pulling? Multiply the Amps by the 120V circuit you're plugging into and you'll get your Watts.
Current (amps)=Watts/Volts =2000/120 =16.75 =16.75 amps
Check the number of amps that your circuit can handle. You should not put devices with more than that many amps (total) on that circuit. Most houses are 15 amps and bathrooms 20 amps.
amprobe
chances are it is a blown fuse. Look under the dash, look for the fuses cover and check the park/lamp fuses. Or check one by one and replace the blown one with another OF THE SAME CAPACITY (AMPS) ... there are 10 Amps, 15 Amps, 20 Amps and 30 Amps ... install only the proper AMPS fuse.
You have to check the label on the unit itself. It will give you all the information as far as maximum and minimum amps.
You can check it out yourself using these formulas. Watts = Amps x Volts. Voltage = Watts/Amps
Borrow a clamp on amp meter and check full load amps. If pulling full load amps then compressor condemned.
If you are using a 120V power supply, a 600 watt floodlight will draw 5 amps of current (600 watts ÷ 120 volts = 5 amps). Remember to always check the specific electrical requirements of your floodlight to ensure the correct amperage.
With a mutimeter test between each lead (usually yellow in color), the reading should be approximately one (1) ohm. or close.
as long as the cranking amps are the correct stye it will tell the cranking amps on the battery check your owners manual for the cranking amps for your van or call an auto parts store and ask them what size you need.
loose wire or fuse.or Dash was off and ground was damaged (fuseable link) start at the fuse box and work your way out with a mutimeter. Check all grounds.
usually around 600 amps, but it depends on the engine you have. For example, a larger engine will require more amps than a smaller engine. a typical 5.0 L V8 requires about 650 amps, and some SUVs have larger and smaller engines. So check your engine,and get the right battery.
check battery and alternator