....HEADLIGHT WIRING UPGRADE..................................................................................From Article by  P. Lander 

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Do not use higher wattage globes without independent relays providing direct current to the lamps or you will burn out your ignition switch, fuse box or dimmer switch.  It is easy to build your own independent wiring/relay harness per the information below.
    PARTS REQUIRED 
       2 x 135 937 501A Relay Bases 
          2 x 161 937 501 Fuse Holders 
          2 x 141 951 253B Relay 
          4 x N 904 219 02 Terminals for Fuse Holder 
          2 x 55/100 Watt H4 P43t Globes (Bosch 41210055/HellaXD1210055) 
          Cable and 6.3mm flat receptacles (std and lanced) as required.
         ASSEMBLY DIRECTIONS 
       Cut the White cable from the rear of the relay plate at C17 
          (yellow housing) and connect with lanced 6.3mm terminals to 
          the new relay base. The cable from C17 to relay terminal 85 
          and the other (headlight wire) to 87. 
          Cut the White/Black cable from the rear of the relay plate at 
          C16 (yellow housing) and connect with lanced 6.3mm terminals 
          to the new relay base. The cable from C16 to relay terminal 
          85 and the other (headlight wire) to 87. 

          Connect two 2.5min Red cables to any spare P terminal and run 
          them to the new fuse holders. Run two 2.5-nm Red cables from 
          the other fuse holder terminals to terminal 30 at the new relay 
          socket.   Then run two brown wires from terminal 86 to the earth 
          point next to the relay board. 

          Slide the relay sockets and fuse holders onto the top of the 
          relay board to a suitable position and replace the fuses and 
          relays. 

          Replace the original headlight globes with the 
          higher wattage globes and check the alignment. 

          A third relay/fuse holder could also be added if required for 
          driving lights.