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• • • • • • BATTERY CABLES AND WIRING IGNITION SWITCH NEUTRAL SAFETY SWITCH STARTER RELAY/SOLENOID STARTER MOTOR TROUBLESHOOTING • Problems fall into Four categories – No Crank – Slow Crank – Starter spins but does not engage – Excessive noise PROCEDURES • • • • • VERIFY PROBLEM DEVELOP CONSISTENT METHOD PERFORM VISUAL INSPECTION CHECK BATTERY PERFORMANCE VERIFY ENGINE CONDITION IF NO CRANK OR SLOW CRANK • (BE CAUTIOUS!) TROUBLE CHARTS • FIND NORMAL AMPERAGE STARTER DRAW SPECS. • BY SYMPTOM, CAN SOMETIMES DIAGNOSE PROBLEM IN STARTING SYSTEM • TESTING EQUIPMENT MUST BE ACCURATE QUICK TEST • • • • TURN HEADLIGHTS ON CRANK ENGINE NOTE RESULTS DON’T OVERCRANK ENGINE CURRENT DRAW TEST • • • • • DISABLE IGNITION VISUAL INSPECT HOOK UP EQUIPMENT TURN OFF ALL ELECTRICAL LOADS PERFORM TEST CURRENT DRAW TEST • VOLTAGE SHOULD NOT GO BELOW 10 VOLTS • AMPERAGE SHOULD BE ABOUT • 4 CYL. 125-150 • 6 CYL. 140-160 • 8 CYL. 160-200 small block • 8 CYL. 200-240 large block CURRENT DRAW TEST VOLTAGE DROP TEST • A CIRCUIT RESISTANCE TEST IS ALSO CALLED A VOLTAGE DROP TEST • YOU HAVE TO TEST BOTH THE POSITIVE AND THE NEGATIVE SIDES VOLTAGE DROP TEST INSULATED CIRCUIT • VOLTMETER ON LOW SCALE • HOOK UP EQUIPMENT • CRANK ENGINE • NOTE VOLTAGE • LESS THAN 0.5 VOLT • ALSO CALLED A INSULATED CIRCUIT RESISTANCE TEST VOLTAGE DROP INSULATED CIRCUIT LAB 164 VOLTAGE DROP GROUND CIRCUIT • SELECT LOW SCALE • HOOK UP EQUIPMENT • CRANK ENGINE • NOTE RESULTS • LESS THAN 0.2V VOLTAGE DROP VOLTAGE DROP GROUND CIRCUIT SOLENOID CIRCUIT TEST • DISABLE IGNITION • LOW VOLT SCALE • CONNECT ACROSS SOLENOID • CRANK ENGINE • VOLTAGE LESS THAN 0.2 VOLT SOLENOID CIRCUIT TEST FREE SPEED TEST • • • • • TESTS STARTER FREE LOAD AMPS RPM CAUTION! COMPARE RESULTS TO SPECS Bench testing a starter STARTER R & R • • • • • DISCONNECT BATTERY! IDENTIFY WIRES PAY ATTENTION TO SHIMS, ETC. ADJUST DRIVE GEAR CLEARANCE RE-CHECK OPERATION THE END