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Originally Posted by 70DATSUN
Same here, everything was there, and everything worked. Still does.
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I have designed a rather special relay that isolates the vehicle lights and switches on the trailer lights. Caravans and trailers for road use as the realy is designed for a pair of 21w incandesent bulbs. This is especialy useful for fog and reversing lights where they are not wanted on the towing vehicle as long as the trailer lights are working (no bulb failured). So its all pritty safe and fit and forget stuff and it is entirely passsive so no wire runs to the front of the vehicle. Only 4 wires to connect. Let me now if you want one. Two would be required if the lights you are switching are left and right individually fused.