Express 1/2 Ton Van V8-305 5.0L VIN M SFI (1998)
Voltage Drop Test
This test checks for voltage being lost along a wire, or through a connection or switch.
1. Connect the positive lead of a voltmeter to the end of the wire (or to one side of the connection or switch) which is closer to the battery.
2. Connect the negative lead to the other end of the wire (or the other side of the connection or switch).
3. Operate the circuit.
4. The voltmeter will show the difference in voltage between the two points.
Testing For Short to Ground
Testing For A Short With Test Lamp Or Voltmeter
WITH A TEST LAMP OR VOLTMETER
1. Remove the blown fuse and disconnect the load.
2. Connect a test lamp or voltmeter across the fuse terminals (be sure that the fuse is powered).
3. Beginning near the Fuse Block, wiggle the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the
test lamp or voltmeter.
4. When the test lamp glows, or the voltmeter registers, there is a short to ground in the wiring near that point.
