Question about 2002 Ford Mustang

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Fuses for 2002 mustang gt

I had my alternator and battery replaced 5 months ago. i just had to buy a new battery and i was told it is running off my battery only. i was wondering if there is a fuse that makes the alternator charge? if there is which one is it? i dont have an owners manuel so i dont know what fuse goes to what?

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  • nbatchler Aug 26, 2008

    I have an 2002 Mustang GT that I just bought. The battery like comes on. So i checked the alternator to see it was charging and it was 14.2 volts on the gauge. So that was good.. SO I checked for possiable lose wires on the ground and positive side and every thing was good.. Sometimes she cranks and sometime she doesnt.. Any help will be useful.. thanks

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There is no fuse for the alternator. If the alternator is working properly, it should charge the battery. Have you had the alternator tested? That is where I would start. Remember, just because it is new, doesn't mean it can't be broken.

Posted on Jul 22, 2008

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I had to replace the battery in my 08 mustang three months ago and after a few weeks is died. Took the car battery to Auto Zone and was told that the new battery was not good. Now this morning my ca


I suspect either a bad voltage regulator (should show up on the alternator test) or something is draining the battery when off. Draining a battery below 12V can cause un-repairable damage to a battery although if only a few weeks old you might try to recondition it with a reconditioning charger.

Mar 27, 2014 | 2008 Ford Mustang

1 Answer

2003 mustang gt drains battery in 2 days


03 Mustang GT (Parasitic) Battery Drain Fix
welcome.gif
Hello,
I am seeing a lot of mustangs are having battery draining issues and I wish to share some simple solutions found while working on a friends 03 GT 4.6ltr.

In a quiet area, key switched off, hood up, Listen carefully close to alternator. I heard a high pitched hissing/whistle sound at low volume, came from back of alternator. This sound was the voltage regulator/rectifier staying on when key is off due to faulty diodes inside the voltage regulator/rectifier circuit, can cause battery to go dead after car not ran in about 2-7 days.

After having the alternator tested free at a parts store, test showed alternator was good because the faulty diodes in the alternator did not show up on the test, the machine did not test for faulty drain back issues that were present.
Alternator on-car-fix:

There was battery voltage running at all times through the two-wire connector on back of alternator. Disconnect the battery first for safety and to reduce chance of short circuit. The yellow wire/with white stripe is hot while car is off so I traced this from the 2-wire connector on the alternator then closer towards driver side front fender. Next I cut the Yellow/White Stripe wire, spliced a good connection wire to it and ran it through a hole in the fire-wall to the fusebox(under dash), connected it to a 15a fuse that does not get used but has power when key is turned on but no power when key is off.

The purpose for re-routing the hot wire to the alternator, is to turn off the alternator charging circuit when the key is turned off so it may not run down the battery. I am seeing good results with this fix(or patch) so far. No More Parasitic Battery Drain!

Another fix can be to change the small pulley on the alternator to a larger pulley so the alternator does not spin too fast, putting too much energy through the diodes can cause a charging system to act a fool. So if you have charging issues and have an alternator changed, putting a larger pulley on can make sense turn into saved dollars(especially on high revving engines).

I hope this info helps to solve some draining battery and/or alternator issues.

thanks.gif for reading,

TyBorg1

Apr 12, 2012 | 2003 Ford Mustang

2 Answers

Installed new battery 6 months ago because battery was discharging one or two time per month then started getting to be more excessive took to shop was told it was ignition i replaced ignition car battery...


Have you checked the alternator? You can start the car, unplug the hot side battery post. If the car dies instantly, it is the alternator. If it stays started, you probably have a bad connection on the post wires of the battery. Using a wiring schematci to check for a break in the line. If you have any questions, let me know. I am here to help in anyway possible. Thanks for choosing FixYa.

Feb 18, 2011 | 2000 Pontiac Grand Am GT

1 Answer

I had my O-2 sensor replaced about 2 yrs. ago on my 1998 Ford Mustang GT, 4.6 liter several years ago. My check engine light came on a month ago and the Dealer told me it was the O-2 sensor. Do I have...


Hi,

$500 is a bit high. The sensors are on the exhaust and basically they help your car exhale. If you continue driving on a bad one it will throw your exhaust, intake and finally engine off key...

They cost about $90 buck a piece if you dont shop around and you can ask a tech savvy neighbor to put them in for you. The website below should be of help.

http://www.autopartswarehouse.com/mmp/ford~mustang~oxygen_sensor~parts.html

Good driving.

G

Feb 10, 2011 | 1998 Ford Mustang

2 Answers

Battery drains when not running


i had the same problem on one of my cars it was the fan control module. replace that and it will fix the problem.

Apr 23, 2010 | 2002 BMW 3 Series

1 Answer

Charging system


have the alternator checked for the internal regulator,if it works the way you say the alternator is defective,i have a 99 GT that had a similar problem and at the end the relay unit was the problem,just have the alternator check for the out put first.

Sep 08, 2009 | 1995 Ford Mustang

1 Answer

Alternator , voltage regulator, alternator fuse ?


the reg is eathier in the alternator or in the front of the car under the hood somtimes by the lite

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Battery Light


You probably need a new alternator and battery. If you have a DMM (Digital Multi Meter) Check the Charging system voltage at idle, it should be around 13.2 volts or above for a properly working Alternator. The battery voltage with the car off should be at 12.6 volts for a good battery. Check and replace as neccessary.

Dec 03, 2008 | 2004 Ford Mustang

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