How to Perform Open Voltage Testing on Your RV Batteries
How to Perform Open Voltage Testing on Your RV Batteries A multimeter may be used to test a 12 volt battery. The black lead should go to the negative port and the red lead to the positive port. How to Perform Open Voltage Testing on Your RV Batteries doityourselfrv.com Learn how to measure the voltage on your 12v battery. Press the “test” button on the side of the meter. The first test with your multimeter will measure dc voltage. indicated with a solid line and a dashed line above a letter v.