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4 . . . ... ... . . . . . . . ..... . , ault Rectification SYSTEM Connect 0 1 V voltmeter as in Test f i t a lead from earth to distributor body, with ignition on and contact breaker points closed: Remake earth connections between Above High resistance or open circuit in distributor Checklrepair or renew contact breaker points, base plate screws as necessary Connect 0 20 V voltmeter as in Test with ignition on and contact breaker points open: Above V- Continuity i n primary windings of coil, supply line and ballast resistor if fitted Carry out Test 15g Carry out Test 15f Zero- open circuit feed to coil, open circuit primary windings, open circuit (iii) ballast resistor if fitted or short circuit in distributor or coil negative lead Connect 0 20 V voltage as in Test with ignition on and contact breaker points open. Remove coil negative lead from coil and recheck voltage: (i) Above 12V- Short circuit in coil, negative lead or distributor Check contact breaker points correctly (or capacitor when ballast resistor fitted) or lead; or renew Carry out Test (ii) Zero - reconnect coil negative lead Connect 0 20 V voltmeter between earth and coil positive terminal, with ignition on and contact breaker points closed: primary windings open circuit (ii) - 12V without ballast resistor If result of Test was above 12V L.T. circuit is satisfactory 7V with ballast resistor (iii) Below or zero without ballast resistor - Excessive resistance or open circuit supply to coil. Leaving the voltmeter connected t o earth, work back through resistance or open circuit is located Renew coil Fault elsewhere Rectifv and recheck (iv) Below or zero with ballast resistor- Excessive resistance o r open circuit in supply to coil Carry out Test Connect 0 20 V voltmeter between earth and the lead the ballast resistor to the coil positive terminal, with the ignition o n and contact breaker points closed: - 7V or above 12V - Fault in the ballast resistor to coil lead Repair or renew lead then re-test Carry out Test Below or zero - Excessive resistance or open circuit between battery and coil Connect 0 20 V voltmeter between earth feed lead to ballast resistor, with ignition on and contact breaker points closed: in ballast resistor Renew and re-test. satisfactory fault elsewhere Zero or below Fault in supply circuit from battery. Leaving the voltmeter connected to earth, work back through the supply circuit at the terminals on the Rectify and re-test. I f satisfactory fault continued |