My father-in-law took his 95 Buick Le Sabre into
a service station for the annual state inspection
and they discovered the horn wouldn't work. They checked fuses and wires but were unable to
correct the problem. He had a battery installed
at Wal-Mart recently. Is is possible they could
have affected the horn when the battery was installed? Is it maybe something simple I can take care of, or should he just take it to the dealer?