Alternator should run everything... Not completely true.

The FARs require that the NORMAL loads do not exceed the 80% of
the output of the alternator (or generator) unless there is a
loadmeter.

Landing lights and landing gear are the kinds of loads that are
excluded.

So it's not required that the alternator be able to run all those
things at
once. Lesse, on my BE33, it's a 70 amp alternator = 56 amps
continuous.
I'm very close to that. The landing light is 20A all by itself =
56+20
= 76 amps = 70A. It works, but barely. Low voltage indication
comes on
while taxiing at low rpm after a landing.

But unless they are 20% of the alternator output, it SHOULD be able
to handle it. Makes me nervous when people keep adding landing lights.