Gnu gets a rear light upgrade

With the light getting gloomier as winter draws in, my decision to fit a pair of LED rear light clusters to the Seven looks like it was an excellent idea. The ones I’ve bought are from Just Add Lightness. I pre-ordered them in mid-September and they arrived, very well packaged in reams of bubble wrap, earlier on this week.

LED lights

The lights with all of the bubble wrap removed. The standard factory supplied flasher relay on a 2016 270 doesn’t work with these lights.

Even with my (very limited) mechanical skills, removing the existing light clusters and fitting the new ones took me just over an hour. Most of that time was spent fiddling with the plug and grommet (removing the old one and then fitting the new) in the narrow gap between the side of the car and the fuel tank. The rest of the procedure was simple, as even I can manage to use a screwdriver.

Half fitted

Half fitted

Left vs Right

Left side with the original incandescent bulbs; right hand side with LEDs. The tail light and brake light (not lit in this picture) are noticeably brighter

Finished!

The finished job

While I was doing the work, I also figured out how the wiring works for a high level brake light. I’ve decided that will be my next upgrade.

Update 11/11/2017 – egg on face time.

I am (or rather, was) a software engineer. I know that you should always test for every possible combination you can think of before you say that something definitely works. I found out today that I hadn’t done my testing very well! Sadly, the standard flasher unit fitted to the 270 doesn’t work well with these indicators – unless you happen to have the hazards on – which is how I’d done my testing yesterday. I realised this as soon as I first indicated to turn right this afternoon.

Quickly heading back to my garage, the WIPAC flasher unit that I’d ordered as a precaution at the same time as the lights didn’t fix the problem. In fact it was worse, as the indicators didn’t work at all rather than simply flashing at a comically high-speed. Oh, and in case you’re wondering, the current Caterham owners’ manual doesn’t tell you where this relay is located on the 270 (although I did eventually manage to find it in the fuse box – it’s the bottom of four relays in there).

I’ve now ordered the RDX relay instead (after a trip to the local motor spares emporium failed to turn up anything that might work) and so have my fingers crossed that it will sort the issue.

Update 14/11/2017 – sorted!

The RDX relay did the trick. Thank you to Just Add Lightness for the very prompt processing of this order. It means Gnu and I will be back on the road again this weekend, weather permitting.

RDX relay

The RDX relay in situ – fourth and last relay down from the top in the 270’s fuse box