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Dave Nova
Dave Nova, ASE Certified Tech
Category: Mercury
Satisfied Customers: 19452
Experience:  ASE Master Certification. GM World Class Certification
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I have a 2002 sable. this is the 2nd time this has happened:

Customer Question

i have a 2002 sable . this is the 2nd time this has happened: its dark out..i'm driving about 55mph and ALL the lights go out-then come back on-out for about 5-10 seconds or so. this morning it happened 2 xs within seconds. Husband checked battery after the 1st time...added alittle water i think. That was a week ago or so. I do not recall loosing any Power tho..........Scared me to death.
Submitted: 1 year ago.
Category: Mercury
Expert:  Dave Nova replied 1 year ago.

This problem is caused by a weak circuit breaker in the headlight switch. The headlight circuit is protected by a circuit breaker, not a fuse. If the circuit breaker gets weak then the lights will cycle off then back on. The circuit breaker is built into the headlight switch so replacing the switch is the necessary repair for this problem.

Customer: replied 1 year ago.
my Inside lights are all connected with the Breaker for the headlights? ALL inside and outside lights are going out then back on.
Expert:  Dave Nova replied 1 year ago.

Park lights and dash lights are on a separate circuit. If you lose all lighting then your problem will more likely be a loose main power feed at the battery, starter, or underhood fuse panel connections.