LT Focus TDCI Serpentine belt replacement and Alternator light still on

[Freddy121]

Hoping for some help.

Replaced the Serpentine belt on the 2007 LT TDCI Focus, however intermittently the Alternator light comes on and off.

Anyone has had a similar issue, the alternator is just out of warranty, replaced 18 months ago.

Only change was the serpentine belt broke, so replaced with a new one.

It does make some noise, which gets louder, when the alternator light comes on.

Thanks