Hank O’Hop Here’s How To Test for Parasitic Loss How to Locate the Trouble Circuit 1. Check Trouble Codes Before you dig in, do yourself a favor and check the trouble codes with an OBD scanner.

3. Complete the Circuit and Listen Simply probe to the other end of the circuit and listen. Again, the multimeter’s alarm signals a complete circuit. Multimeter Resistance Test Disconnect battery 1.

A diagnosis of any electrical system, whether it is 12 or 24 volts, must include two key elements. First, you must test the complete circuit. Second, you must understand how that circuit works. One of ...