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The reading is the voltage drop at that point in the circuit. Record the reading. Measure the voltage drop at each wire and connection in the circuit, including the negative return, then add up the results. The total of all these measurements must fall within either the 3 percent or 10 percent limit. Any reading that’s a lot higher than the others in the circuit indicates a point in the circuit with excessive resistance or voltage drop. Correct any problem by cleaning or tightening the connection, or by replacing the connecting wire.
This absence of a reading can be dangerous because it can lead the novice to believe the circuit is turned off when it’s in fact still live or hot. Figure 3-5 on page 32 illustrates a multimeter properly connected to a 12-volt circuit to check for adequate voltage at a cabin light. The red meter lead is connected to the positive terminal on the light, and the black lead is connected to the negative connection. Many beginners get confused when they try to check voltage at points throughout a circuit and can’t ﬁgure out what to do with the black lead.
Then trace the wires from the switch to the blower motor itself. Aha! Look there—right where the blower leads emerge from the engine compartment bulkhead. See that white powder on the terminal block? It’s copper oxide and it’s a sure sign of corrosion. Sure enough, a close inspection shows a terminal that’s completely engulfed in the stuff. First, make sure the blower switch is turned off. Then remove the terminal with a screwdriver, then a quick scrape with your trusty pocket knife takes care of the corrosion.