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MercCo ... 3/14/2011

2000 Mercury Cougar V6 6 Cyl 2.5L

Preventive Maintenance

What causes the headlights, dashlights, cabin lights (basically any electrical item that has lights) to flicker?

Flickering occurs when the light switch is turned "ON", whether parking lights or headlights, with or without high beams, or interior cabin lights. Lights flicker rapidly, bright/dim.

2 Answers


CVO 3/16/2011

Inspect the headlight switch, replace it as necessary.
Headlight switch directs current to the headlights and running lights to turn them on or off.
When not replaced, headlights will run continually or not function, potentially causing premature headlight failure and/or safety issues.


b_ballboy_2013 1/3/2013

check the belt/belt tensioner if te tensioner is jumping it could cause the lights to be running on the battery and the altenator that is why they flash when the altenator takes hold of the belt they flash and if you watch close your lighs will flash with the tensioner jumping i just replaced my belt and it stoped but could be falty tensioner.....fix soon if it is cause it will short out altenator which is lik $125 plus


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