On the originals the third pin is used to flash the dash repeaters via additional contacts in the indicator switch whereas on electronic units the third pin is connected to earth. Originally the mgb used a cylindrical 3 pin flasher unit gfu103 lucas fl5 but this is not the same as modern electronic 3 pin flashers.
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Wiring diagram for lucas 6ra relay. Wiring behind instrument panel. Service brake check relay behind lh blank panel. Wiring behind lighting switch. This 123 ignition distributor is specifically designed to replace lucas distributors on classic mini engines there is a separate distributor for a plus engines refer to 030804.
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