The brake lights don't work... but I don't get a "bulb failure" warning, which should happen if a bulb fails.
So it isn't simple.
There are no obvious fuses for the brake lights.

There are strange things happening here... The Prince of Darkness seems to be at large.

Sorry Peter, I do not know the operation of bulb fail monitoring aspect of the circuit. My expectation would be that as brakes are a safety circuit that any monitoring of their operation would not affect their primary function, and that monitoring would be a secondary and seperate part of the circuit that should be unable to affect the primary function.... But then I have been wrong before, and more than once...

Peter, I may be completely wrong here but when I was in industry when canbus systems were popping up one of the problems I found was that at the end of the wiring cct (canbus) there is usually a small resistor in the cct that sometimes fails... of course it may all be different nowadays.


David Byrne

Peter, just change your dealer......

That ties in with the Canbus on my Roadster David. On the topology schematic there are 120Ω terminator resistors on medium and high speed networks linking BCU, PCM and instrument cluster. Guessing these are to load the networks and hide any random transients that might otherwise errantly trigger something.

It also shows twisted pairs of interconnecting cables carrying high and low signals on each network, again designed to cancel out random inductions.

It might be the way to go Peter. Such an annoying random fault on a limited production run hybrid system is, pardon me for suggesting, seemingly beyond the pay grade for most if not all Morgan dealers. At this stage I would tempted to seek out a Canbus expert (easily said I know) and better spend money there.

My brother had a Mondeo Titanium X with a recurring, annoying dash problem. He had no help from Ford but found such an expert who had come up with a fix for the random electronic speedo error's he was suffering.

Peter, just had a thought, you haven't changed any bulbs or electrical devices lately because if I remember correctly a small deviation from the expected resistance will send things haywire.
Also don't trust any chinese made bulbs they may not be compatible , they also generate a lot of electrical noise.

David Byrne

many thanks John - I'll let Williams know, and hopefully they can fix it.

I guess Morgan bought a job lot of Mini Cooper headlamps in 2007, with wiring - so my 2017/8 build car has 15 year old wiring in places.

Will

Had the friendly little “ bulb failure” message again today. Checked all lights- all good. Only failure seems to be the warning. Hopefully when I fire it up tomorrow to drive to Stonor it will have gone.

It’s gone.

Til next time?