you dont you need an ammeter for that
Purchase, borrow, or have someone with a volt meter or multimeter check it for you. If you don't know what a volt meter or multi meter is, have an electrician check it for you.
Use a volt meter Plug a 120 volt accessory into it
test light or volt meter
Normally red. Check the wires with a volt meter to be sure.
Remove the battery and check it with a volt meter.
With a digital volt meter.
Divide the power rating (in watts) by the voltage (in volts). So if you use a 100 watt light bulb in a typical 110 volt lamp then it will draw 100/110 = .91 amps of current. Or plug a 1500 watt electric heater into a 110 volt wall socket and it will draw 1500/110 = 13.6 amps of current.
The answer is 12 volts, unless the ohms meter says different,check first before you assume.
To check a cam sensor you can either use a scanner which plugs into the vehicle communication port or use a volt meter and check if the sensor produces a pulse like reading on the meter.
put a volt meter on the battery and check reading and see if it matches the metere in the car if over 15.0 volts, alternator is likely over charging
Check for broken wires. You can check for this using a simple cheap volt/ohm meter.
Check the batteries in the remote with a volt meter.