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GI-28 SERVICE INFORMATION FOR ELECTRICAL INCIDENT VOLTAGE CHECK METHOD ● Connect one probe of the DMM to a known good ground. ● Begin probing at one end of the circuit and work your way to the other end. ● With SW1 open, probe at SW1 to check for voltage. ● Close SW1 and probe at relay. ● Close the relay and probe at the solenoid. Any powered circuit can be diagnosed using the approach in the previous example. Testing for “Shorts” in the Circuit To simplify the discussion of shorts in the system, please refer to the following schematic. RESISTANCE CHECK METHOD ● Disconnect the battery negative cable and remove the blown fuse. ● Disconnect all loads (SW1 open, relay disconnected and solenoid disconnected) powered through the ● Connect one probe of the DMM to the load side of the fuse terminal. Connect the other probe to a known ● With SW1 open, check for continuity. ● Close SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good ● Close SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and VOLTAGE CHECK METHOD ● Remove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid discon- ● Turn the ignition key to the ON or START position. Verify battery voltage at the battery + side of the fuse ● With SW1 open and the DMM leads across both fuse terminals, check for voltage. SGI847-A |