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Voltage check method 1. Remove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid dis- connected) powered through the fuse. 2. Turn the ignition key to the ON or START position. Verify battery voltage at the B + side of the fuse ter- minal (one lead on the B + terminal side of the fuse block and one lead on a known good ground). 3. With SW1 open and the DMM leads across both fuse terminals, check for voltage. voltage; short is between fuse block and SW1 (point A). no voltage; short is further down the circuit than SW1. 4. With SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check for voltage. short is between SW1 and the relay (point B). no voltage; short is further down the circuit than the relay. 5. With SW1 closed, relay contacts jumped with fused jumper wire check for voltage. voltage; short is down the circuit of the relay or between the relay and the disconnected solenoid no voltage; retrace steps and check power to fuse block. GROUND INSPECTION Ground connections are very important to the proper operation of electrical and electronic circuits. Ground the wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in SGI853 Ground Inspection Remove bolt (screw). Inspect mating surfaces Reinstall bolt (screw) HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT Circuit Inspection (Cont’d) GI-31 |