The kits make the headlight loom a very low current draw as all the light switch does is trigger the relay. The other side of the relay wires the lights back to the battery and so takes the current load. Thus the heavier wiring in the kit. The D1, D2 and Defender's (pre-07) don't have a relayed headlight system.
drivesafe can add anything I've left out of the explination.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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