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How many of you have driven behind a vehicle in less than ideal conditions… going dark, raining or foggy… and uttered those immortal words “Put you lights on mate” in the vein hope it will do some good only to approach a bit closer to find that the lights are on and are less effective as a couple of Ikea tea lights in jam jars. That is the feeling I get with a lot of caravans. In my opinion a lot for rear lights are less than ideal. In this day and age some of the drivers out there need all the help they can get as they even struggle to notice a big white box in front of them in bright sunshine let alone in inclement weather or in the dark.

Our caravan like a lot of other Swift caravans looks great from the rear with nice big lights and reflectors. Reflectors are good if the following driver has turned his headlights on and not been too busy texting and simply relying on the DRL’s to light the way. The big reversing lights will surly let the driver and anyone else behind know you are reversing… but about as useless as the aforementioned Ikea tea light in a jam jar when reversing at an angle into a pitch at night. The rear fog light however deserves a special mention… the single rear fog light…. can you see it… the tiny Lego brick sized rear fog light… the red thing in the middle down low… difficult to spot on a stationary caravan in daylight let alone from a distance on a road in fog. Mind you when that bit of wire in the bulb warms up it will blind you… honestly it will…. eventually… when you get so close because you didn’t see it from ten metres away.

Its time for a change. An upgrade if you will… to allow me to shine a beacon of light towards all that follow. But… and here’s a the big thing… I have to keep it looking nice. Everyone likes a nice rear don’t they.

OK, I searched for all the replacement options. Swift don’t make it easy. The two panels that the lights are mounted in don’t come out, well not easily and I was cautioned about even attempting to remove them. Changing to smart round LED lights was out. Then it struck me… the reversing lights could become fog lights and I would install new reversing lights. I’d towed a trailer a while ago that had football stadium sized reversing lights and wow what a difference it made. One of the first things I did with the Amarok when we got it was to install LED work lights under the rear bumper as reversing lights and that was a huge improvement so I ordered another set from the same company as I’d fitted to the Amarok.

A bit more searching I found the exact lenses for the existing lights in red to turn the reversing lights into fog lights.. it was actually cheaper to order a pair of complete lights than it was to order two replacement red lenses… I’ll never work that one out.

Ok how was I going to wire this lot up. I made a couple of brackets that fitted under the caravan allowing me to mount the reversing lights up close just inboard of the rear steady jacks. This would offer a modicum of protection from road debris thrown up by the tyres. These could be wired to run off the old fog light which would now become a junction box and the reverse lights would become the fog lights, so simply switching the reverse light and fog light cables over at the road light fuse box in the front of the caravan would have everything working correctly.

I also angled the reversing lights out slightly. I wanted the centre of their light pool to be along an extended side line of the caravan so that looking through my mirrors down each side of the caravan would be the centre of the lit area. This hopefully would provide the best angle of illumination when reversing and performing a reversing turn onto a pitch.

“Hang on lads… I’ve got an idea”

Cue the music… no, no doors were blown off during this mod. Right what if the new rear fog lights could be my brake lights when they weren’t being used as fog lights?

A simple diode blocking bridge using two diodes could do this quite easily. Routing through my electronics spares I found a bag of 10 Amp diodes which would easily cope with the task.

For a quick solution I used two strips of terminal block and built a quick blocking bridge. What happens now is applying the brakes powers up the brake light circuit and the fog lights. The diode in the fog light circuit stops me back feeding current to the tow vehicle fog light circuit.

Turning on the fog lights powers up the fog lights and the diode in the bridge stops it powering the brake lights in either the caravan or back feeding to the tow vehicle. Really simple and when testing I didn’t have any canbus or other errors thrown up by the VW Amarok’s management system. The existing (and original) brake and tail lights work as normal.

I’ll have a look at coming up with a better solution than using two lengths of terminal strip and probably build something in a small electrical project box so it can be mounted securely.

As far as I can tell the changes I’ve made all fall in line with the lighting regs for trailers. While I’m 99% sure, there is always the possibility that I could be corrected and shown the error of my ways and point out I have missed something in my reading of the regs. I’ll let you know.

The next thing…

I’m trying to find some good quality bright LED replacement bulbs for all the rear road lights. I have some, but I suspect they are not correctly marked. If anyone has any recommendations for replacement 25W and 5/25W bulbs that they deem are good options to look at, especially if they are correctly marked, please let me know in the comments. If you are a company that sells LED replacement bulbs and think they are the good enough to pass the Caravan Chronicles testing department (we don’t actually have a testing department… its just me) then challenge me to break them!

Safe travels everyone… and “PUT YOUR LIGHTS ON MATE”