How To Check Amp Draw On Car Battery. Record the amount of voltage drop present. Ignore negative voltage readings or switch your test probe orientation if seeing the negative symbol distracts you.
Then we take the equivalent amp hours of a battery based in its RC or CCA rating see my article link above and divide it by parasitic amps 24 hours. When that happens sulfation begins. Place the positive and negative test probe on each side of a single fuse.
Make sure you do not put the red.
Reading the AMP. The normal range of a car capacity varies from 50 to 100Ah Amps Hours and hence its battery can supply around 50 100 amperes for 20 hours before the voltage falls flat below 105 108 volts in general. Attach the AMP meter to the battery. Start with a fully charged.
