Reverse light & New Caterham Light Kit

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Ralph
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Reverse light & New Caterham Light Kit

Hi All

Just installed the new Caterham rear light kit, look great  but still working on getting the reverse light to work.

As for the reversing light I am confused as I don’t seem to have the normal set up, the switch only has one pop stud connector (see photos), and on top of that the wire does not show any power (tried with ignition on checked fuse but nothing). At the other end two wires presumably one live and one earth but they are the same colour green.

Questions

1. would this switch work with the new lights anyway?

3. If all else fails I am thinking of changing the switch to the normal 2 pin and rewiring. Any ideas on the easiest way to do this.

Just need a few ideas in case I am missing something obvious as I am not an auto electrician.

Jonathan Kay
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On the reversing light switch:

It's known that the factory wired this in two different ways.

Can you see the colour of the wire to that connector?

With one connector like that I'd suspect that it's switching the light to earth. You can test that with a multimeter or by disconnecting the wire and touching that directly to the gearbox and seeing if the light comes on, might need ignition ON. That would need to be the old light.

If it is this then there shouldn't be any power there, see next post.

Would you like the wiring diagram for your Seven?

Jonathan

Jonathan Kay
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"At the other end two wires presumably one live and one earth but they are the same colour green."

Green is conventionally a live feed to accessories switched with the ignition. Where is "the other end"... at the lamp unit?

With a switched earth circuit there needs to be a live feed to the lamp unit. It then lights up when the earth side  from the lamp unit is connected to earth by the switch eg in the gearbox.

Jonathan

Jonathan Kay
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"Questions

1. would this switch work with the new lights anyway?

3. If all else fails I am thinking of changing the switch to the normal 2 pin and rewiring. Any ideas on the easiest way to do this."

Let's confirm what you've got, as above. Then look at the options. NB LED units usually have to be connected the right way round.

Jonathan

Beagler
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Mine has bulbs in rear lights except numberplate light and that came with LED.

2019 270S 1.6

John Vine
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I've not seen a reversing-light switch like that before.  What model of car do you have?

Running through CC's instruction video (very good, by the way!) for the LED rear-light kit, the first thing that struck me was that the kit connectors for both fog light and reversing light had single wires (r/l = green, fog = orange). So, presumably, only the 12v supply is carried forward and the old earth is redundant.  CC claim that the kit fits all models.

...the wire does not show any power (tried with ignition on checked fuse but nothing).

Assuming this is the 12v supply, did you engage reverse gear first?

It then lights up when the earth side  from the lamp unit is connected to earth by the switch eg in the gearbox.

I got the impression from the video that there isn't an earth wire, just a single 12v line.  So, if your switch wire (with the popper) is an earth line, I can see why the light wouldn't work.

JV

SLR No.77
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Ralph, what age is your car?  I've fitted the new light kit to my 1999 car and it's all just plug and play, the new loom connects to the various econoseal connectors as per the original lights, the only difference being that the original numberplate wire is no longer used.

Having had a 1995 car previously I would have had to add the various plugs to the loom to update it to post- '96 wiring spec before fitting the new kit, fairly straightforward though with the correct connectors and tools. Pre-'96 wiring is very different though to current cars and certainly had a permanent feed to the reversing light, illuminating when switched to earth at the gearbox.

To add ... Caterham fail to mention in their instruction video that you'll do a much better job with the boot floor removed, enabling the new loom to be fed above the fuel tank support brackets at each end of the tank. 

Stu.

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The register for all numbered limited-edition Caterhams ....... www.thecaterhamregister.net ...... www.instagram.com/thecaterhamregister

TomB
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Confirm the reversing light earths through the gearbox, so its a single wire only on my 1995/early 96 car.  

Jonathan Kay
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"Confirm the reversing light earths through the gearbox, so its a single wire only on my 1995/early 96 car. "

Thanks. And looks like that connector?

Jonathan

SLR No.77
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Yes

 

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Jonathan Kay
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Thanks

Jonathan