Join the third test wire to the battery positive, also to the rectifier earth bolt or case. Connect the wire removed from the battery, in turn, to the white and green terminals. If the bulb lights in these two tests the rectifier is defective. Take off the test wires from rectifier and remake the circuit. Remove the negative wire from the battery. Join the third test wire to the battery negative terminal, also to the brown rectifier terminal. Connect the wire removed from the battery in turn, to the green and white terminals. Should the bulb light in either of these tests the rectifier is defective,
LUCAS ELECTRICAL SERVICE Lucas A.C. Lighting-Ignition Unit Alternator Model RM15 The alternator consists of a spigot-mounted 6-coil laminated stator bolted to the outer portion of chaincase with a rotor carried on and driven by an extension of the crankshaft. The rotor has an hexagonal steel core, each face of which carries a high energy permanent magnet keyed to a laminated pole tip. The pole tips are riveted circumferentially to brass side plates, the assembly being cast in aluminium and machined to give a smooth external finish. Thus there are no rotating windings, commutator, brush-gear, bearings or oil seals and consequently the alternator requires no maintenance apart from occasionally checking the snap connectors in the three output cables are clean and tight, which are located behind the frame cover which is located by two knurled screws. If it is necessary, for any purpose, to remove the rotor, there is no necessity to fit keepers to the rotor poles. When the rotor is removed wipe off any metal swarf which may have collected on the pole tips. Place the rotor in a clean place. Normal running. Under normal running conditions (i.e., ignition switch in IGN position) electrical energy in the form of rectified alternating current passes through the battery from the alternator—the rate of output depends on the position of the lighting switch. When no lights are in use, the alternator output supplies the ignition coil and trickle-charges the battery. When the lighting switch is turned, the output is automatically increased to meet the additional load of the parking lights and again when the main bulb is in use, Emergency starting. An EMERGENCY starting position is provided in the ignition switch for use if the battery has become discharged. Under these conditions, the alternator is connected direct to the ignition coil, allowing the engine to be started independently of the battery. Once the engine is running, turn the ignition switch back to the normal running position, otherwise misfiring will occur. Emergency charging. Should the battery became discharged a temporary boost can be effected during daylight running, by an alteration to the alternator connections. The snap connectors are located behind the frame plate, which is se111
