MGB Wiring Diagram with Key & Cable Colour Code - Workshop Manual Page 13

This is page 13 of a factory workshop manual, presenting Section J, the complete vehicle wiring diagram along with its numbered key. The key identifies over 50 electrical components by callout number, including the dynamo, control box, twin 6-volt batteries, starter solenoid and motor, lighting switch, headlamps and dip switch, side/stop/tail lamps, panel light rheostat, fuse unit, horn, flasher unit and direction indicators, heater/fresh-air motor, fuel and oil pressure gauges, windscreen wiper motor and switch, ignition coil, distributor, fuel pump, speedometer, tachometer, bi-metal voltage stabilizer, and optional-extra items (marked with an asterisk) such as fog/driving lamps, cigar lighter, radio, and the complete overdrive system (relay, solenoid, manual control switch, gear switch, and throttle switch). A cable colour code table decodes wire colors: N=Brown, U=Blue, R=Red, P=Purple, G=Green, LG=Light green, W=White, Y=Yellow, B=Black, with a note that two-letter codes indicate main colour then tracer colour. The full schematic (drawing B5179A) is printed sideways on the lower half of the page, showing the interconnections of all keyed components. A reader can use this page to trace circuits, identify wire colors, and locate components in the car's electrical system.