Just joined the forum and already feel better as lots have had similar problems with 156 lights!
My symptoms are a bit different from most though...excuse the long story.
Came to use my 156 on Monday night and the battery was flat. I thought I might have left my radio on which could have caused it, as hadn't used the car for four days.
I went to recharge the battery and I couldn't open the bonnet as the latch had seized.
Got RAC man out who managed to get it started by jacking the car up and attaching leads to the starter motor. We then managed to get the bonnet open too by spraying WD40 through the grill.
While he was there I asked him to check my rear light which I knew was faulty. We couldn't get rear light and brake light to both work, and he noticed a rosy glow - yes, the light was on even when switched off. We noticed a sidelight was blown too.
Later on I noticed that my passenger sidelight was on, even when switched off!! Ahah, I thought, maybe that was what had caused the flat battery, but why? Removed bulb so it wouldn't flatten my battery again.
Today I replaced sidelight I had taken out and this time it didn't stay on
I replaced my blown sidelight, amidst much cursing about Italian design and needing the skills of a gynaecologist just to replace a bulb. Not to mention the fiver for the bulb
Then, to the back. Put new bulb in for good measure.
No rosy glow now, brake light works, rear light not. Bulb works fine in the other side
So - is this the rev counter problem or another??? As Sod's Law would have it, Alf's MOT is due next week
HELP!! Any suggestions welcome. I hope it's not the rev counter and hope to get garage to run lead across from the good light to the bad light as an easy fix as suggested in the threads I have checked.
Sorry for the long story...