Okey doke, new brake light switch (2nd new one) installed. Seemed ok. But then it didn’t, dash lights on again (grrrr).
So, removed it, checked it, put it back in, seemed ok. Did a bit of twisting and tweaking. Tried twisting the switch all the way in, that just left the brake lights on. Tried twisting the switch out a bit, brake lights went off, dash lights off. Then tried twisting the switch further out, brake lights stayed off, dash lights off - awesome!.
Started the Zed up this morning, grr, lights again on the dash! Drove the car in to work. Did a bit of checking, made sure engine was warm. Started Zed, all ok, no issues, then lights came on. Turned ignition off, did the pedal dance, turned the car back on - dash lights straight back on.
so, did a bit of twisting / turning of the brake light switch. Ignition on, did the pedal dance, started the car. Yay, no dash lights, so just left things as they were! Got in the Zed to leave work, and headed off.
15 minutes after leaving from work - BING! - dash lights on again - damn it!
Ok, on startup from cold, she revs up to 1500rpm initially. But then drops down to about 1000rpm. Eventually settling down to 650-ish rpm’s after a minute or so. She drives fine, brakes fine, accelerated fine. She seems to be behaving generally very well.
I think next steps, I will try gradual twisting of the brake switch again, but at marked intervals of turn. And see whether that addresses the issue. Gut feel is that this is likely to be something stupid like a dirty connection or similar.
However; gut feel, followed by a process of gradual elimination over three years. Has got me to exactly where I am now, no further forward. So any more ideas or thoughts are welcome