The radial load from pulling the side of the output shaft that
exceeds the factory spec by a tight belt will cause premature
wear of output shaft bearings. Instead use a grip compound
or replace the worn belt.

Here's a rule of thumb:  Push down on the belt halfway
between pulleys with a force of about 24 lbs. The belt
should deflect 12-17mm.

Check the fuse first, just to eliminate it.

Yes, this is exactly the description of a loose alternator
belt: Squeals on first startup, then quiets down.

If you're handy and have a set of metric wrenches and
sockets, it shouldn't be hard to tighten it up yourself.
There's a free online manual at www.autozone.com , On the
left, click on "Repair Info," then "Vehicle Repair Guides."
Click on car year, make, and model, etc.

I just noticed 2 problems tonight for the first time and I wonder if it
might be related to having the alternator changed Saturday:

- The cigarette lighter dont work anymore (but it worked until this morning,
which is 36h after the change). The blue light around it is still on but
much weaker

- I heard a high pitched squeaking sound a few seconds after I started
tonight, that sound disappeared after that (loose belt?) Once again, first
time I hear that.

Other things to know: Today is kinda cool (for Texas) (50F), lights, radio,
A/C all that works just fine.

anyone has ideas?