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Voltage Drop Testing

1. Connect your DVOM negative lead to the battery’s negative post.
2. Connect your DVOM positive lead to the battery’s positive post and measure its voltage. Record this reading.
3. Connect your DVOM positive lead to the positive side of the load being tested, as close to the load as possible.
4. Operate the circuit, and record your measurement.
5. Connect your DVOM positive lead to the negative side of the load being tested, as close to the load as possible.
6. Operate the circuit and record your measurement.

Let’s take a closer look at these steps. First, we want to test the integrity of the ENTIRE circuit so placing your test leads at the battery is a must. You can make an extension lead for your DVOM so you can always connect to the battery ground terminal with your negative meter lead. Second, it is important to know the source voltage available. If the battery is weak to start with, your circuit is already working with a handicap. Even better is to measure source voltage with the engine running, and use that as your baseline.