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Headlights and dome lights pulsating at idle

Old 01-07-2019, 11:02 PM
  #1  
Smithaero448
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Default Headlights and dome lights pulsating at idle

Was wondering if anyone had an idea of what could be going on or had the same problem the headlights and dome lights are pulsating only at idle i had alternater and battery tested and both are good.?
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Old 01-08-2019, 06:34 AM
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08'MustangDude
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Pulsating is usually the alternator, one or two of the diodes are bad. Doesn't
matter that it tested good.
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Old 01-08-2019, 11:51 AM
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Smithaero448
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Default Pulsating headlights

Ok thanks man the new altenator doesnt even have 4 thousand miles on it yet you think it could be bad already?
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Old 01-08-2019, 04:18 PM
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08'MustangDude
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It could be, and check all the grounds too...
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Old 01-08-2019, 04:23 PM
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Urambo Tauro
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Yeah I once had (a reman) one go bad in <50 miles.

Last edited by Urambo Tauro; 01-10-2019 at 02:07 PM. Reason: grammar
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Old 01-08-2019, 09:22 PM
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Smithaero448
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Ok thanks ill let you guys know if the altenator fixes the problem.
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Old 01-10-2019, 01:51 PM
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Derf00
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Originally Posted by Smithaero448 View Post
Ok thanks man the new altenator doesnt even have 4 thousand miles on it yet you think it could be bad already?

Absolutely can be bad. Where'd you get it from? Guy i work with has a Nissan Fronteir, chased his tail for a couple months trying to fix a similar issue. Replacing the alt was one of his first things he did.. Long story short, he finally took it to the dealer, bad alt. Replaced with another new alt or a remaned alt and problem solved. He originally had a Duralast brand alt that he bought.
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Old 01-10-2019, 06:12 PM
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Smithaero448
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Just changed the alternator today no more fluttering lights cant believe that altenator was bad in 4000 miles thanks guys appreciate it.
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Old 01-11-2019, 02:08 PM
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Derf00
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Glad to hear you fixed it. Hopefully exchanged for free under warranty?

Yuh, hard to believe only 4K miles on yours and my coworkers was bad out of the box! What brand was yours?
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Old 01-13-2019, 05:00 AM
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Gravydog316
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loose wiring?
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