Is my Alternator wired wrong?

[48richard]

My internally-regulated alternator works (it keeps the battery charged), but the generator light has never worked since I bought my truck.

I believe the blue wire, which is connected to the brown wire from the bulkhead connector, should be connected to the left hand terminal (looking from the back) not the right hand one as it is now, and there should be a jumper from the right hand terminal to the battery connection.

What is confusing me is that I have read that the alternator will not work without 12v on that left-hand (#1) terminal, but there's been nothing there for at least the 2 years I have owned the truck.

Any ideas?