'MESS' Recommended Middlebridge Head light upgrade Original MB headlight wiring is dangerous because only the main beam outer lamps have a relay and all current for inner main beams and outer dipped lamps go through the switch, thus it may become overloaded and fail (MB50 switch/ connector actually melted). It could be life threatening if headlights suddenly go out when you're moving quickly on an unlit road, not to mention possibility of an electrical fire to boot.

MB50 is now modified to incorporate relays to all headlight circuits. The original headlights fuse box fuse holder clips were found to be very weak (hardly gripping fuses) and so replaced with fused relays for both inner main beam and outer dipped circuits. The original outer dipped fuses (10A x 2) replaced with a single in line fuse of 20A. I found it easier and cheaper to use fused relays than buy a new original type fuse box.

Original circuit



Modified circuit



Many thanks to Peter Freeman for providing the wiring diagrams.

Once again, We 'the MESS' thank Alan Timmis for this very important upgrade. Thanks Alan

Mick G