Question about 2005 Ford F-150

1 Answer

2002 F150 Radio went dead, noticed voltage dropping almost completely. Turned off heat and lights. Shortly afterwards, voltage returns back to normal. Everything is operational. I let run for 15 min to help recharge battery. Came back and voltage was completely gone again. Dead Cell? Bad voltage regulator? Bad Alternator?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,865 Answers

The gauge in your truck reads the alternator output. Following are the possible causes:

1. Belt is slipping
2. Battery is shorted
3. Poor connection at battery or to frame
4. Alternator failing

The fact that it came back after turning off the heat and lights, I suspect the belt, and would start there.

Posted on Nov 12, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2009 800 dragon....while returning home....dash lights went out...10 minutes later headlight went out...then motor quit shortly afterwards....what went wrong?

it could be the alternator went bad charge the battery and take the alternator off and have it checked at the autoparts store and if it's bad get a New one that should take care of the problem

Dec 12, 2016 | Cars & Trucks

2 Answers

What is wrong when the battery light comes on while driving?

The battery light comes on when there is an issue with the charging system. Likely your alternator is no longer able to keep up wth the accessories that where on and the charging voltage was dropping to about battery voltage. This is pretty easy to check with a voltmeter. Check voltage at the battery terminals. With the engine off you should see around 12.4 volts. With the ingle running and all the accessories turned on you should see more than 13.5 volts and closer or more than 14 volts would be ideal. If you don't have that than it's probably time for a new alternator.

Mar 01, 2015 | Cars & Trucks

1 Answer

Turn key, no start, dash dead, but intermittent symptons

First I would look for voltage drop of both end of battery terminal.not a look or seem tight . you have to do it (voltage drop) and terminal at alternator.
now does alternator charging. take voltage of battery
if the problem occur have voltage of battery taken
like I read your problem it looks like wiring terminal ground and positive
the noise you hear is probably low voltage to a relay and the dropping voltage make the relay switch inside relay cycling noise click or buzz

Oct 05, 2013 | Chevrolet Cavalier Cars & Trucks

2 Answers

I was driving along in my 1998 ford ranger XLT(manual) and i noticed the battery light came on. soon after that the radio and all dash lights went dead. after that the truck just died. my brother looked at...

It could very well be the starter after you get the starter fixed if the battery light is still on while the truck is running you can use a volt meter to check the voltage on the alternator or if you don't have a meter you can disconnect the pos post from the battery if it stays running the starter was the problem if it goes dead your alternator is bad i hope its not but that's what it sounds like to me. The starter does complete the circuit but when the alternator goes it will drain the battery losing one function at a time until she just gos dead. Hope this helps

May 31, 2011 | 1998 Ford Ranger SuperCab

2 Answers

2002 Ford F 150 Supercrew,,,,5.4. noticed cruise control stopped day,,turned on a/c ,,fan motor works,,,no cold air,,,,,,,,,,,,tried turning on heat,,,,,,fan works, no HOT air....

try disconnecting the cluster fuse and the radio fuse and see what happen if everything work...u might have an open circuit or a short on one of the electronic in your truck

Apr 21, 2010 | 2002 Ford F150 Regular Cab

1 Answer

I went on holiday for about two months and my roommate said she turned the car once a week. when i returned, i tried to turn it on but the battery was dead. AAA came and jumpstarted it and it turned on...

Dead battery, but to know for sure the battery is the issue, it MUST be fully charged and then load tested...

Facts on batteries, if you draw it totally and completely down, many never return..

The reason for the battery charge is, for example, diodes in your alternator can fail, everything appears to work, but when the vehicle is off, there is a voltage leak to ground. To test, measure how much voltage and amperage is going out of the battery when the vehicle is off, pull negative and put meter in series at that point. Do not be fooled by radio and clock, and you may want to pull fuses until you get nothing drawing out of the battery....for testing

Sep 25, 2009 | 2005 Peugeot 405

2 Answers

Low battery voltage light battery won't hold charge 2002 S60

Yup, time for a new alternator. Most models have the regulator built into the alternator, so it makes it a little bit more expensive - but it will resolve your problems. If you are driving at night with a load on your charging system (lights and radio on), you will probably notice you have dim headlights. If you don't change it soon, you'll end up having to replace your battery too.

Jul 19, 2009 | 2002 Volvo S60

2 Answers

Guages when crazy. Now won't even try to start.

You likely have it repaired by now but it sounds like a classic case of oxidized battery or cable connection (sometimes mis-diagnosed as bad battery but cured with new (clean) battery)

Feb 25, 2009 | 2002 Jeep Grand Cherokee

2 Answers


check you battery and battery cables...sounds like a big voltage drop

Feb 22, 2009 | 2002 Nissan Xterra

1 Answer

2002 camaro won't start...

hi there it seems that your ignition switch is no good try to replace ignition it relativity a cheap part good luck

Jul 11, 2008 | 2002 Chevrolet Camaro

Not finding what you are looking for?
2005 Ford F-150 Logo

208 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers


Level 3 Expert

5501 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides