Alternator issues part 2

[joey200sx]

Back ground

After the car was sitting for around a month I started it and it just started.
I notif d one of the tyres was a little on the low side so I used a cigarette lighter air compressor.

After doing this the car started to miss fire and the alternator was only giving 10v.

So I purchased a second hand working unit from slide motorsport.

Swapped this over.
Jump started the car and it charged the battery fine. 14+v
Winner.

Few days later driving to work. Car started to miss fire again. Low and behold. Alternator not charging battery again.

Am I the unluckiest man alive and it was at the end of its life or does it sound like there is an underlying issue?

If so, what kills alternators?

Cheers lads

[jdm_virgin]

Maybe worth checking the wiring for continuity as they could be busted

[Vigilant teSte]

Where is the battery?

[joey200sx]

It is in standard position. It has not been relocated.

[joey200sx]

Will be getting a reconditioned one from garage d.
Think I've just been unlucky getting an old unit that has also failed.