Wiring for reversing light.

Why not seek the advice of an auto electrician?

I have a wiring schematic that I used when i did exactly the same thing on my old Hilux . If you msg me your email address i'll flick it to you tonight when i get home.

Brew come and see me.

We do auto electrical and I will tell you how to doit.

Regards Richard

Using your numbers this is how I'm reading this
86 is the trigger (reverse switch, gearbox)
30 powers the relay, (wires big enough to run 55W)
This is what I would do,
run the trigger wire to the three way switch from reverse,run another +ve to other side of switch, nil for centre of switch.
position A = big reverse light comes on with reverse
position B = normal reverse lights, no biggun'
position C = big light comes on ,nil reverse
Where/how relays and wiring done are up to you, just make sure wiring is up to the job, one 55W light wont require a real lot, both the trigger wire and +ve to the switch won't need much at all because the real power for the light will come from the relay,
One thing I will suggest, and that is have some sort in cab warning light indicating that big light is on, IE, illuminated switch
Shane

Brew69
I wired mine up just by tapping into the appropiate wiring, but why do you need to switch it on when not reversing.....Hmmm let me guess , you want to shine it at following motorists who don't dip lights, I would say that is illegal ,

Spot on Blaze.

That's only 5A draw - why not just fuse and switch it Brew ? I just bought another vehicle - it has a Kaymar rear carrier and provision for a work lamp - in the process of making and finishing it off now - will probably tap into an existing circuit close to the tail - one which supplies a 120W max supply to a factory placed cig outlet.