Question about 1990 Ford F150

1 Answer

Electrial system warning light stays on even with key off

Have checked alternator it's ok. battery goes dead

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 409 Answers

Remove the negative battery cable and connect a 12 volt teat light between the terminal and the battery post. Make sure all doors and trunk are closed and all consumers are in the off position. The light should glow. Now pull one fuse at a time until the light goes out. When it goes out that the circuit thats causing the draw.

Posted on Feb 15, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Battery ok alt new battery light stays on


The light means the alternator is not charging the battery. Once the charging circuit is completed, the warning light looses its ground connection.
You may need to double check the circuit going from the alternator to the battery, or the warning light circuit going to the alternator as it could be shorted to ground.

Sep 22, 2015 | 1995 Honda Civic del sol

1 Answer

Electrical problems 1997 cavalier


First make sure the battery is fully charged. Also make sure the belt on the alternator is not broken/missing. after you charge the battery,start the vehicle and put a voltage meter/multimeter on volts dc and apply the leads to the battery posts,you should see anywhere from 13-14.5 volts from the alternator if it is working. if not,check the fuse or fuses for the alternator. if the fuse is good,replace the alternator,and test the battery.

Jun 15, 2014 | 1997 Chevrolet Cavalier

2 Answers

Battery light comes on when engine is off.


Warning on alternators never take positive terminal off battery when engine running a good chance you will fry the regulator or diode plate. Usually when the light stays on with ignition off indicates damaged negative diode in the rectifier. Try removing the warning light wire at the alternator if the light goes out this will indicate the above problem. If not then check if there is a charge relay. Please let me know if you have further problem and include more information on your findings.

Apr 07, 2012 | Cars & Trucks

3 Answers

Electrical power system service required.....ABS warning light, generator warning light, brake failure...car stalled and wont't restart


usually caused by failed generator. Fix the generator and other lights will also extinguish. The car should jump start, but will not stay running without a charged battery. Recommend removing the generator and take to parts store for testing. Would you like instructions for removing generator?

Oct 17, 2010 | 2001 Volvo V70

1 Answer

Warning lights stay on even though levels all check out..


check your charging system, a weak alternator may cause that

Mar 13, 2010 | 1994 Nissan Pathfinder

2 Answers

My battery will not hold a charge. I suspect it is the alternator, but at $269.00 I would like to know if there is something else that could cause this?...he battery has been replaced.


what you do is uhook alternater wires and tape let car sit and see, if battery goes dead then thats not the problem. also have charging system and battery checked first. hope this helps.

Oct 09, 2009 | 2006 Chevrolet Impala

2 Answers

2006 Chevy Trailblazer without warning completely goes dead


Sounds like a dead battery, loose or dirty battery cable connections.

Aug 21, 2009 | 2006 Chevrolet Trailblazer

1 Answer

No power whatsoever to 2002 PT Cruiser, no lights, remote door lock doesn't work, nothing when I turn the ignition key. Just parked it yesterday and it worked fine. Had the battery replaced about a month...


Start by checking the battery even if it's new. If the alternator is not charging it, it will go dead even if it's new. If a recharge gets it started, then get the alternator checked. Once running a simple check of the Alt. is to put a voltmeter across the battery terminals and see if you have 14v which usually indicates it's OK. If the Alt. is OK look for a battery drain. Something staying on all the time even when the engine is off.

Mar 19, 2009 | Mitsubishi Diamante Cars & Trucks

1 Answer

Electrial problems never saw this one


sounds like the alternator has stopped charging or has bad connection at battery

Dec 08, 2008 | 1992 Dodge Grand Caravan

Not finding what you are looking for?
1990 Ford F150 Logo

Related Topics:

121 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

63242 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21981 Answers

Fordexpert

Level 3 Expert

5331 Answers

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

Answer questions

Manuals & User Guides

Loading...