Question about 2002 Ford F150 Regular Cab

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2002 F150 5.4L parasitic drain intermittent won't start sometimes in little 6-7 hours sometimes takes days

This has been to dealer kept for two days and couldn't figure out. They thought may have been battery, GEM or battery saver relays. I replaced all recommended: GEM had no water issues, battery saver relay and battery, but still same problem sets various amount of time, Can be short as 6-7 hours or may go several days and be OK, generally if sets overnight won't start, battery low and need to charge or jump.

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  • Ford Master
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Parasitic drain on electrical system .
How to Find Parasitic Battery Drain

Posted on Jul 13, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 1993 Ford Aerostar Parasite drain on battery

You should not worry about the batteries, but look again what's is the real problem if there is one.

Posted on Sep 23, 2008

Loringh
  • 185 Answers

SOURCE: 2002 Ford F150 Supercrew - Electrical problem! Help!

dk mak r

As a retired electrical engineer this intrigues me. If you were my neighbor I would put an ammeter in series with the batteery lead to see just how much current is being drawn by the "mystery" load.

When you disconnect or hook up the battery can you see any sparks when the cable touches the battery terminal?

If the battery can get run down over night that is a significant drain.

If there is some sign of spark when you connect/disconnect the battery lead try the following.
Selectively remove a fuse in the fuse panel, (starting with the larger fuses, 15A, 20A) and then connect the battery terminal and see if you still have a spark.

Hope this helps Good luck Loringh

Posted on Nov 08, 2008

  • 1 Answer

SOURCE: battery saver relay is on and wont start taurus 1999

where is the battery relay saver on ford ranger 98 4x4

Posted on May 01, 2010

  • 580 Answers

SOURCE: My 1998 Ford Taurus has a battery that keeps dying

You obviously have a short. I think it may be your starter selinoid or starter relay. It could also be a mercury switch failure in your trunk or under the hood. They turn the lights on & off accordingly under the hoods. Have your starter checked out. Also it could be an ignition switch problem. Check the starter first. Good luck!

Posted on Jun 16, 2010

jturcotte
  • 8589 Answers

SOURCE: ford F150 2002 drains battery overnight, new

Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 03, 2010

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Battery drains in two days on a 1969 Chevy truck by the way it's a stock 6 cylinder three on the tree


There isn't any electronics on this 1969 truck , so can't blame it on that. I worked at a Chevy dealer ship back in the Early to mid 80's an saw this problem more then a few times. I remember glove boxes stuffed so full that the light stayed on and drained the battery over night. The vehicle wouldn't start next day an they had it towed to the dealer. I have found bad diodes in the alternator cause this problem. I post a YouTube video for you , beside my test procedure ! To test for parasitic drain on the battery you have to put an amp meter in series on the negative battery cable. This vehicle shouldn't have any drain, yours apparently does are the battery wouldn't go dead. With the meter hooked up start pulling fuses till the meter shows no more drain. How to Find Parasitic Battery Drain If after you pull all the fuses an the drain is still there , disconnect the wire on the back of the alternator and see if that makes a difference ! hope this helps

Dec 27, 2014 | Cars & Trucks

1 Answer

My 2002 Toyota Tundra 4.7(V8) has an intermittent start and the battery drains overnight from 12.5V to around 10.0V. I've tested for parasitic draw and every time I test my reading is ~ .025A...


I think I would attack the drain problem first. Something has to be draining the battery, it does not have to be a steady drain. It could be something serious for 30 min in the middle of the night. You may need to pull fuses one at a time to try to narrow down the circuit. it could even be a weak component in the alternator or computer. I know you said you replaced the alternator.
If it goes down overnight, it should also go down during the day. Can you leave the meter connected and check it every hour or so ? ?
Another component that could be suspect is the key switch. I know you said you checked it, but it could be a part-time problem.
When the starter or relay clicks, I would want to know how much voltage I have at the starter post, and coming out of the key switch. Then how much at each point in between. You also have a neutral safety switch in that circuit.

Jun 02, 2013 | Cars & Trucks

1 Answer

2003 mazda tribute, occasionally won't start. fuel pump replaced about 1 month ago. bad starter?


Many batteries may only last around three years. Check battery voltage at rest before starting. Any voltage in the low 12v range may be a sign of a faulty battery.If low voltage present, then perform a parasitic drain test:1) Disconnect battery POSITIVE terminal and connect ammeter in series, between battery positive terminal and positive lead.
DO NOT START THE VEHICLE!!

2) With all vehicle doors closed, alarm off, lights off, radio off, and all other accessories off, wait for around 20 minutes and then read the ammeter. A healthy system should read about 0.03 amps and little more. If reading more, then the vehicle could be suffering a parasitic amp drain, and you will need to locate this issue.


3) Reconnect battery when finished.


If no major parasitic drain present, yet low battery voltage then:


4) With vehicle started, check the voltage charge from the alternator. Connect voltmeter to battery terminals and take reading. A healthy system should be charging in the range of 14volts or down to around 13.5 volts. If reading around 12 volts only, then check and replace alternator.

Nov 03, 2012 | Cars & Trucks

2 Answers

99 toyota corolla drains battery. After parking the car for a few days, it won't start...just a clicking noise. I thought my battery was bad and got it tested at autozone...the guys told me it was not...


You may have a parasitic drain on the battery.
Check the voltage on your fuses after you turn it off. Wait 5 minutes before doing so.
Hook up an Amp meter in series with the battery and see what the current draw is. If it is more than 250 milliamps you have a parasitic drain.

Jun 06, 2017 | 1999 Toyota Corolla

1 Answer

Intermittant dead battery problem since buying a 2005 GMC Yukon Denali XL in 2009 with 25,000 miles. I have replaced the battery twice and local GMC dealer replaced battery terminal once. I don't believe...


A technician will need to a parasitic drain test on the electrical system to determine where the battery drain is taking place. Sometimes the glovebox or vanity mirror lamps don't shut off and drain the battery.

Sep 27, 2010 | GMC Yukon Denali Cars & Trucks

1 Answer

Buick century 2003, slow drain overnight, wont start in morning


To know for sure you need to do parasitic draw testing ! Not looking for a magical fix on here . has anyone ran into any issues that may cause drain, like glove box light switch etc,???? In my thrity years of repairing vehicles have seen a lot of thing's cause this problem .Back in the 80's when i first started at chevy dealer saw glove boxes stuff full ,to the point light would stay on . These day's more like a module not powering down when it's suppose to. Hooking up a amp meter between the neg. battery post and neg. cable an checking amp draw. If it's over 80 miliamps you have a draw on the electrical system. Pulling fuse's till the draw goes away . find what all that fues powers and isolate the different circuits till the draw goes away . That's kind of the long way now a days . There is a much easier way ,voltage drop testing accross the fuse's .
The BEST Way TO Perform Parasitic Draw Test

How To Perform Parasitic Draw Test EricTheCarGuy

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1 Answer

Battery Drain, same problem


you can put a meter on bat and watch for drainage and while draining or amp pull pull fuses one at a time to see if stops when stops that is the circuit that is draining bat.

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