Question about 2005 Ford F-150

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Dim or pulsating headlights at low rpm

The headlights and dash panel lights in my truck pulsate at low rpm (idle) and occasionally on long distance at highway speeds I've noticed a strange sound in conjunction with a momentary spike or overcharge reading on the dash panel charging gauge. Is this indicative of a bad voltage regulator?

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  • 208 Answers

Go to your local auto zone they will put a check on the battery, most likley the altanator is going out but it could be the battery, they can check it while it is in the vehicle

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: High temperature gauge reading, low battery voltage reading

The loud whine you speak of indicates one of two things a bad serpentine belt or alternator, The first thing would be to check the belt.Look for cracks worn spots or glazing. If the belt looks ok then take the belt off and start the engine for a minute or so and listen for noise.

Posted on Jan 01, 2009

chuck943
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SOURCE: My 2000 Ford Taurus at about 4000 rpm does not go

To do this in park or neutral is normal. To do it while driving is not.
There are so many things that could cause this but if you have no check engine light and it runs normally up until then I would suspect you have an exhaust restriction. This can be checked fairly easy on this vehicle, it has a DPFE sensor that mounts near the top back side of the motor.It will either be black or silver,will have a 3 wire connector to it and 2 hoses going down the back of the motor to the exhaust. You can disconnect one of these hoses and install a vacuum/pressure guage and measure exhaust back pressure. It should be 1 psi or less at idle and when you go to wide open throttle should not exceed 3 to 4 psi. If it does something in exhaust,most likely one of the catalytic convertors is stopped up.

Posted on Feb 19, 2009

  • 1986 Answers

SOURCE: 98 expedition battery light comes on with increase of rpm

There may be no loss of voltage, but is there a surge of voltage?

As for the battery itself when tested, it should read 12-12.5Volts across the
leads when the car is off. When the car is running, the battery should be reading 13-14Volts across the leads, anything lower means the alternator is not charging your battery, anything higher means the alternator is over charging and damaging your battery.

Another cause for the battery light could be your ECU has detected an error

Posted on Aug 20, 2009

Testimonial: "thanks, haven't seen a alternator discharge light go on and off, normally it's either worked or didn't"

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SOURCE: low oil presure

perform a master oil pressure test. this is done by removing the oil pressure sending unit and installing a oil pressure gauge. if the reading on the test gauge is ok, the sending unit needs to be replaced. if the pressure reads low on the test gauge, there may be excessive bearing wear or you may have worn valve guides. good luck!

Posted on Apr 29, 2010

jturcotte
  • 7779 Answers

SOURCE: 2004 F350 dually crewcab turbo

Below is your wiring diagram. So does the battery run down or not? At 12 volts, the battery should run down. Here are a couple things to check. The grey 20 gage fusible link from the battery to the alternator runs the stator coil. You could try jumping that with a regular 14 gage wire to see if the voltage will jump up (should be at least 14 volts). The other thing is with dual batteries (which I think you have), if one battery is bad, it could pull down your voltage. Try unhooking the negative terminal on one battery at a time to see if the voltage increases. Let me know if you have any questions.


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Posted on Dec 06, 2010

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