Join Date: Jul 2011
Location: Cologne, Germany
the alt light is fed by a green wire from alternator to that main connector block (under the hood on fender, near your speedo counter thingy) and from there direct to the instrument.
check green cable is clean and tight at both alternator and connector block ends.
It could also be the voltage regulator (this is built into the back of the alt, but easy and cheap to replace in situ)
Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.