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Wiring diagrams for mgb mgc click links for 33 different wiring diagrams for mgb and mgc large format in color these pdf files can print full size on 11 x 17 paper. 78 mgb wiring diagram in addition 1978 chevy truck wiring diagram 1974 mgb wiring schematic 1978 chevy van wiring diagram 1977 mgb wiring 1976 mg wiring diagram 1973 mgb wiring diagram 1976 mgb dash wiring 1978 mgb wiring diagram 1967 mgb tachometer wiring 1975 mg midget wiring 1972 mg midget wiring on for double horns 1978 chevrolet wiring . But sometime in 1978 when the ignition relay circuit on rhd cars was modified to add a second in line fuse between brown white and green wires under the fusebox the indicators and tach heater fan and gt grw were powered from one of these the one with the thinner wires the other with thick wires being for the cooling fan. Electric cooling fans schematics 4 cylinder cars 4 cylinder cars with added relay factory v8 factory v8 modified hover over a wire to confirm the colour all cars fans share a earth with the headlights so a slightly poor earth connection here may cause the headlights to dim more than usual when the fans switch on likewise when the headlights . Let there be light fuses and relays hi all another battle with the prince of darkness the fuse box and lights horn switching is one of the common failure points on the mg electrical system the fuse holder is weak and the clips corrode and loose tension and the large consumers lights horns fan wipers are directly switch which is hard on the old switch gear long time on list has