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Q:

my headlighs go off and on while the car is sitting still what can cause that
on 1992 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
head lights go offo and on while I am sitting still
(2) Answers
if you mean while car is parked and your horn doesnt work
it may be you triggered the anti-theft
I do it ocassionally