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pulsating lights

07-20-2010, 10:06 AM
hello all,i have a 2002 trailblazer with the headlights pulsating with the idle including when idled up they pulse faster....any ideas?

07-20-2010, 03:16 PM
Check alternator output when it does this. Do the interior lites also pulse?

07-21-2010, 10:40 AM
does it all the time but have not checked to see if interior lights flicker as well,i will check that out and for checking alt plug u mean to see if i am getting that same pulse thru the electric?

07-21-2010, 12:48 PM
See if the alt output also fluctuates.

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