Now I know it usually gets a bad rap and is blamed for everything from the neighbours budgie dying downwards, but it seems the BeCM is actually a pretty clever little beastie. Last weekend I had to tow this to just north of Toulouse
Not only is it 9 feet tall and 6 feet wide, so acts as a braking parachute in a headwind, it was also well loaded so almost at it's maximum weight of 3.5 Tonnes. The weekend coincided with Storm Diana hitting the south of England and most of France too which meant two things, the channel crossing was going to be rough and once the other side I'd have a hell of a headwind. Also the route includes some pretty serious hills both up and down. So, rather than risk being rammed up the back by an empty artic who may not realise the speed differential while I was slogging up a hill in the dark, I put a magnetic 55W halogen amber beacon on one side of the trailer. The trailer has a junction box near the back where all the wiring connects so it was easy enough to connect the beacon to one of the sidelight circuits in there.
About 20 miles from Dover, I get a beep from the dash and the message centre comes up with RH Tail Light Bulb Blown but a few minutes later I notice that the LH side marker lights and beacon had gone out on the trailer. Switched the lights off and back on again and everything came back on. Seems that the extra load of the beacon on one sidelight circuit had been seen, eventually, by the BeCM as a short circuit bulb which would only happen if the bulb had blown so it had switched that circuit off to prevent the possibility of further damage in lieu of there being a fuse in the sidelight circuit. When I next stopped I ran a wire from the beacon to the ignition switched supply in the boot but it did prove that the trailer lights were wired back to front so the LH and RH circuits were crossed I was more impressed with the way the BeCM cuts power to a circuit it detects a problem on, so not so dumb as many seem to think it is.
Incidentally, I took the picture in my avatar on the way back but what was most interesting was the difference between the run there, against the wind with the trailer and coming back with the wind behind me and no trailer. Trip out, average speed 43 mph at 12mpg, coming back, average speed 67mph at 17.2mpg. Seems aerodynamics, or a lack of them, make a hell of a difference......