Alternator Help - VW T25 1983 1.9 Petrol

[leni_kampa]

Hi All,
First time posting. My alternator isn't charging my van starting battery. On testing returning 1 or 2 volts back to it when (I think) I'm expecting 14 volts! Wiring looks a bit dodgy too (seen in Alternator Back).

Current alternator is - Prestolite 66021492 (will attach photos) 55AMP

I require it for split charging (Leisure Battery, no fridge).  Any suggestons on a replacement alternator. Checking JK/VW Heritage website (£££'s) is helpful but wanted to check best brand, price, capacity, and where to buy suggestions.  e.g. Would 65AMP be sufficient for my needs?

Alternator Top
Alternator Front
Alternator Back

On a side note, I also have a knocking noise when i press the accelerator travelling anything over 20 mph (ish) - is it possible this could be the alternator brush(es) not working correctly? 

Many thanks
Andrew 

[jrt]

Take the voltage regulator off the alternator ( 2 screws) and inspect the brushes, they are probably worn.
Cheap and easy to replace.
David.

[tandemsandy]

^wot jrt said, replacing the voltage regulator/brushes unit works wonders - did mine a few months ago and those missing volts suddenly returned.  
Rob