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This guide shows how to replace the headlight bulbs on the Triumph Bonneville T120. The first step is to unscrew the two 5 mm Allen bolts on the side of the headlight and remove the inner body of the headlight. Disconnect the two electrical connectors from the central body of the headlight. Place this element on a cloth to avoid damaging the lens, then remove the bulb retaining spring by taking it off the clips. Extract the old bulb and replace it with the new one; handle the new bulb carefully to avoid touching the glass with bare hands to prevent damage. Once installed, reconnect the two electrical connectors and test the headlight's functionality. Refit the headlight body and tighten the two Allen bolts.

Updated on 29 May 2026 by ScegliAuto

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