New to this group - have UK june 90 accord 20li

The battery warning lamp has begun to stay on at start up - especially
when very cold weather, then goes off OK once the car is warmed up a
while. Searching posts here - I'm suspecting brushes or bad
connection.The belts were replaced a while back and are tight.

Strangely, the ABS light is also coming on with it sometimes, then
going off with it. This I really don't understand, as this only comes
on if I have a fault on the brake light, bulb etc.

With regard connections - does the alt.charging wire go to battery
terminal or to the starter motor pos. I have an extra small gauge wire
connecting in to the main battery pos terminal?

On the brushes - are these serviceable ? I have air con as well, so to
get the thing out, just to check it over, is a real pain.

I haven't yet tried a mult meter across the battery terminals at tick
over with the light ON - as its stopped doing it now the weather is
warmer ! I was getting 14.2 volts on the old battery with engine
running at start up - so there would seem no problem when it is ok.
The real test would be the voltage at the battery with the light ON,
engine running, but the last couple of days its ok.
Any tips for removing the alternator on UK right hand drive, air con
model - I have heard its awkward !
Thanks - Geoff, Bristol UK