Pulsating headlight?

2004 FORD EXPLORER
143,264 MILES • 5.0L • 6 CYL • 4WD • AUTOMATIC
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JAMES MICHAEL PEDERSEN
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The headlights taillights dashboard lights and dom lights pulsat at any rpm range. I replaced the alternater and battery and it is still happening. I am thinking it might be a open ground, but I do not know where to start having no schematic to go off of. Please help. I am on a very low income. Thanks, James Pedersen
May 20, 2016 at 10:13 PM
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HMAC300
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make sure terminal ends are clean on battery terminals first, then check belt and tensioner recommended replacement for both is 60,000 miles. the tensioner looses tension and belt wears and alternator will not charge correctly.
May 21, 2016 at 7:31 AM
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JAMES MICHAEL PEDERSEN
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I will give that a try. Thanks
May 21, 2016 at 2:24 PM
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STRAILER
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Hey JAMES,

Is the voltage regulator separate on that model? if so I would replace it.
May 21, 2016 at 7:53 PM
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JAMES MICHAEL PEDERSEN
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  • 3 POSTS
Thanks, I will look into it.
May 22, 2016 at 12:03 PM
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HMAC300
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regulator is an internal with alternator.
May 22, 2016 at 1:18 PM