Piper ARCHER II Pilot Operating Handbook page 52

ELECTRICAL FAILURES
NOTE
When opcrating with light electrical load and a fully
charged battery, the Alternator Inop. Light may
illuminate due to minimal alternator output. If the
alternator is functional, a slight increase in electrical
load should extinguish the Inop. indication.
ALT annunciator light illuminated:
AMIMCICD.cececsecscesecccceeeevenesessenesesesecscarscsssaseveceesesavasatencs Check to verify inop. alt.
'If ammeter shows zero:
Reduce electrical loads to minimum:
If alternator loads are reduced:
ALT SWICK.
cece cccseeseunesssecsscsusersveceuseesussssnecssesssscsnscssestsceniecesensnuerssueeneesass OFF