I had a new interior light fitted as the old one was faulty. Taking my car down to Scotty in next 2 weeks - so will get him to check with ammeter for me. Could it be that the alternator is at fault, mine is orig one still?

Even when driving, SECs shows voltage at about 12.8 - 12.9 not ever into the 13s and if I switch engine off and just have ignition on, the voltage drops quite rapidly to 11.0 - 11.1

It all started when I didn't use the car for a month and battery went flat, then after being charged, I had all sorts of problems with the alarm going off 5 mins after being activated. I then got a new battery, reset the alarm but still goes off after 5 mins and none of the other faults have gone away