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What is the purpose of a turn signal relay box?

Box purpose Relay signal turn
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What is the purpose of a turn signal relay box?

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You only need relay boxes if any turn signal filament shares it’s duties with a brake lamp filament. Relay boxes simply take a left or right brake lamp out of the brake lamp circuit and connects the turn signal circuit. This is the case with a TD and also with a TC EXU where those lamps on the petrol tank are used. A true EXU has no “D” lamps but many owners have installed two of them on both EXU and normal TCs. If you have two brake lights and are braking, both (hopefully) brake lamp filaments are lit up. If you also have turn signals and lets say you are signaling to the right, then the left brake lamp continues to show the steady brake signal, but the right lamp filament now starts to flash. The steady brake signal on the right side is interrupted by the relay and is fed the pulsing turn signal input until you turn off the turn signal. The relay boxes act the same way even if you are not braking at the time you signal. The brake lamp circuit is interrupted if there is a brake signal

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