As, I can speak from my own experience, then this might be voltage regulator failing.
Symptoms of my car -
1) power draw around 2A, when alternator disconnected - 0,05A (noticeably less)
2) When started car, Voltmeter on battery showed 18V, turned off car immediately.
3) Completely all lights were dimming and brightening up.
Easiest way to get to voltage regulator is from the top, after lifting out of the way coolant reservoir.
And by the look of that voltage regulator, seems like a correct one, atleast that was on my car.
Take off that reservoir and bracket on which it is supported and after that you have to take off plastic cover on top of alternator, and after that just undo all screws which are on the end of alternator, swap voltage regulators and screw everything back together.
To make things easier, you can undo oil filter, but be warned with consequences (oil on the ground etc.).
When I did this to my car, I put back on old filter after voltage regulator swap, but soon afterwards I serviced it.
Symptoms of my car -
1) power draw around 2A, when alternator disconnected - 0,05A (noticeably less)
2) When started car, Voltmeter on battery showed 18V, turned off car immediately.
3) Completely all lights were dimming and brightening up.
Easiest way to get to voltage regulator is from the top, after lifting out of the way coolant reservoir.
And by the look of that voltage regulator, seems like a correct one, atleast that was on my car.
Take off that reservoir and bracket on which it is supported and after that you have to take off plastic cover on top of alternator, and after that just undo all screws which are on the end of alternator, swap voltage regulators and screw everything back together.
To make things easier, you can undo oil filter, but be warned with consequences (oil on the ground etc.).
When I did this to my car, I put back on old filter after voltage regulator swap, but soon afterwards I serviced it.