If it is your voltmeter that drops while the vehicle is running. Most likely the alternator isn't putting out enough volts.
Current (expressed in amperes) is measured using an ammeter, while voltage (expressed in volts) is measured using a voltmeter.
It usually means that your alternator (or generator) is not charging the battery. At this point you need to check system voltage with a voltmeter when the engine is running. You should see at least 13.5 to 14.5 volts. If it is less than that, it is not charging. You can also have the charging checked at a repair shop if you don't have a voltmeter.
Pull the hot (+) positive lead on the battery while running...If car quits it's bad. Best way is to put voltmeter (Multimeter) on battery while running..if 13 + volts at idle then alternator is good, if 14+ then it's great!
Check with a voltmeter connected to the battery Voltage with engine running should be approx. 13.8-14.2 volts- above this could be a defective voltage regulator
A 2000 Chevy Venture might skip while driving because of water in the fuel or damaged or dirty fuel injectors. You might also have an issue with the distributor.
A potentiometer is a variable resistor, while a voltmeter is a device that measures voltage.
Either the battery is weak and not charging properly, the connections are dirty on the terminals of the battery or the alternator is not putting out enough power. If you rev up the van does it go out or is it on while you are driving?
Probably fuel pump failure.
fuel pump might be going out
There could be a few reasons why a 2000 Chevy Impala shuts off while driving. There could be a problem with the fuel pump, a bad spark plug, or even a loose battery cable.
An ideal voltmeter has infinite resistance, while an ideal ammeter has zero resistance.