On going problem with the alternator light faintly glowing,

HELP...

Have now changed...

alternator, battery, multiplug on alternator

oh have changed the belt too., and checked the mountings..

Have you checked that the alternator is charging?

My bet would be the regulator. Typical symptoms are almost goes out at 1-2000 rpm but glows a little more brightly at higher revs. Battery doesn't go flat but is being overcharged. If you check with a multimeter across the terminals at 3000 rpm + you will find voltage above 15 ish.

could also be feedback from through your warning lamp - solved by adding a diode into the circuit...I had this on a bright six module.