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Pulsating headlight?

Tiny
JAMES MICHAEL PEDERSEN
  • MEMBER
  • 2004 FORD EXPLORER
  • 5.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 143,264 MILES
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
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Friday, May 20th, 2016 AT 10:13 PM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Saturday, May 21st, 2016 AT 7:31 AM
Tiny
JAMES MICHAEL PEDERSEN
  • MEMBER
  • 3 POSTS
I will give that a try. Thanks
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Saturday, May 21st, 2016 AT 2:24 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,636 POSTS
Hey JAMES,

Is the voltage regulator separate on that model? If so I would replace it.
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+1
Saturday, May 21st, 2016 AT 7:53 PM
Tiny
JAMES MICHAEL PEDERSEN
  • MEMBER
  • 3 POSTS
Thanks, I will look into it.
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Sunday, May 22nd, 2016 AT 12:03 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Regulator is an internal with alternator.
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Sunday, May 22nd, 2016 AT 1:18 PM

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