bring back tapatalk
AO Silver Member
Join Date: Jun 2010
Location: United Kingdom
Now that I think back further, I also had switch problems (before installing CC) that left the brake lights on after braking - noticed this at night. Lifting the pedal would cure it, until I eventually fixed it by bending the switch bracket slightly.
When CC was installed, it gave similar issues, presumably because the gap was enough for the brake input but not that. I taped a five pence piece to it for a while before replacing the switch. As I said I'm not certain that the brake lights weren't stuck on again, but I doubt it.
It may be different on diesels, but none of this gave power issues. Another point against it is that the conflicting inputs would probably log a diagnostic fault - I had one, but I didn't record the details. This only shows up when reading faults, i.e. doesn't generate a MCSF. I also found that dodgy switches are a common problem, so presumably lots of people would be reporting the same as the OP, and I've never heard of it before.
It does seem like a worthy avenue of investigation, especially since under normal conditions one is live and one is not.