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How Do I? Defender Interior light on Series

I've just bought a Defender courtesy light for my S3 and would appreciate a little help with wiring it up. The switch has three positions - on off and presumably a position that's triggered by a switch on the driver's door.

Can anyone tell me how I should connect this to be fully operational? The switch has three terminals - two at one end which I assume attaches to a connector, and a curious looking terminal at the other end that appears to be made of alloy.

Any help greatfully received :) .
 

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Terminal 3 is straight to earth and can be achived by a screw holding the unit to the roof. As I recall, terminal 1 is the feed and terminal 2 the output to the courtessy light switches on the door posts. This only works with the light's switch in the middle position. The OFF and second ON position work irrespective of whether you have a courtessy system.

I fitted three of these lights with the courtessy light terminals all wired to ine harness connected to each of the three door switches so all three come on when any door is opened.
 
Nick,

What kind of door switches did you use? I thought the conventional plunger type had just one terminal for earth. I like the idea of any door triggering all the lights.
 
Nick,

What kind of door switches did you use? I thought the conventional plunger type had just one terminal for earth. I like the idea of any door triggering all the lights.
Yep, just the standard plunger type. I removed all four from my Cavalier before it was taken away, so have some spares. They're grey instead of black, but if they're of any use...

You just need to wire the switches and the light unit second terminals all together. I ran one positive feed up the windscreen pillar and along the gutter channel, breaking off into feeds to each unit's terminal 1. I then had another earthing wire run along the gutter, connected to each terminal 2, and down the windscreen pillar and rear door pillar.

At the rear, this earth wire was connected to a courtessy switch mounted in the tub's door shut, inside of the door seal. At the front, the wire ran inside the instrument panel and out into the engine bay. From there, it connected to another wire which runs from door pillar to door pillar (the pillar tops are open to the engine bay) and to each pillars' switch. The correct colour for this wire is purple with a black stripe.

The two rear lights are screwed directly to the roof panel, with the screws being hidden inside the exterior rib. A good dollop of heavy grease prevents water ingress and corrosion of the two metals. The screw through the ringed hole (terminal 3) earths the unit for the continuously on switch position.
 
Yup just done this in Herb, although I did not wire it up to the doors, it is switch opperated only! Worth the effort! :)
 
Yep, just the standard plunger type. I removed all four from my Cavalier before it was taken away, so have some spares. They're grey instead of black, but if they're of any use...

You just need to wire the switches and the light unit second terminals all together. I ran one positive feed up the windscreen pillar and along the gutter channel, breaking off into feeds to each unit's terminal 1. I then had another earthing wire run along the gutter, connected to each terminal 2, and down the windscreen pillar and rear door pillar.

At the rear, this earth wire was connected to a courtessy switch mounted in the tub's door shut, inside of the door seal. At the front, the wire ran inside the instrument panel and out into the engine bay. From there, it connected to another wire which runs from door pillar to door pillar (the pillar tops are open to the engine bay) and to each pillars' switch. The correct colour for this wire is purple with a black stripe.

The two rear lights are screwed directly to the roof panel, with the screws being hidden inside the exterior rib. A good dollop of heavy grease prevents water ingress and corrosion of the two metals. The screw through the ringed hole (terminal 3) earths the unit for the continuously on switch position.

Thanks; I'm going to give this a go. :)
 
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