Mopar R114620M ALTERNATR-REMAN

Although it is preferable to have a faulty alternator tested by a dealer or auto electrician, home mechanics with the necessary gauges and testers can assess the feasibility of repair or determine if a new or factory reconditioned unit is a more economical choice, especially if the original alternator has high mileage. To test the charging voltage, first disconnect the battery positive lead and connect an ammeter between the lead and the battery terminal. Then, connect a voltmeter between the 'L' terminal on the alternator and earth; a non-zero reading indicates a defective alternator or wiring. With the ignition on but the engine off, the voltmeter should read significantly lower than 12V; if it reads around 12V, the alternator is likely faulty. After short-circuiting the ammeter terminals and starting the engine, increase the engine speed to between 2000 and 3000 rpm. If the ammeter shows 5A or less, check the voltmeter reading, which should be between 14.1 and 14.7V at 68°F (20°C). If the ammeter exceeds 5A, continue charging the battery until the reading falls below that threshold or replace the battery with a fully charged one, then recheck the charging voltage. For output checks, disconnect the battery negative lead and the lead from the B terminal on the alternator, connecting an ammeter between the B terminal and the disconnected lead. If a tachometer is not already installed, connect one according to the maker's instructions, then reconnect the battery negative lead and connect a voltmeter between the B terminal of the alternator and earth. Start the engine, turn on the headlamps, and increase the engine speed to 1300 rpm; the output current should be between 13 and 16A at 13.5V. If the readings fall outside this range, the alternator is faulty.

The alternator has rotor and stator, Three phase a.c is produced at the stator coils as the rotor rotates. This current is rectified by the use of silicon diodes and an integrated regulator unit to control the required voltage level for the charging of the battery. Cleaning entails, now and then, wiping off any dirt or oil on the surface of the unit while no lubrications are required because the bearings are pre-packed with grease and expected to last for the entire life of a typical air conditioning system. It is thus recommended occasionally to check the drivebelt tension to confirm that it still has the right deflection which is right when it can be deflected 0.38 inch (9.5mm) by moderate thumb pressure at middle of its longest span. Changing the position of the belt demands loosening the alternators lower pivot bolt, and the upper adjuster link bolt, and then sliding the alternator closer or away from the engine.

Take extreme care when making circuit connections to a vehicle fitted with an alternator and observe the following, always match correct polarity when connecting the alternator to a battery. Before using electric-arc welding equipment to repair any part of the vehicle, disconnect the connector from the alternator and remove the positive battery terminal. Never start the car with a battery charger connected, and always disconnect both battery leads before using a main charger. If boosting from another battery, connect in parallel using heavy cable.