Question about 2000 Ford Focus

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Broke down bad alternator need a quick fix

How to fix an alternator with just a wire

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Replace Alternator. Can order or get one at your local parts house. The Alternator is essential to your rig, It charges the battery as you drive.

Posted on May 09, 2013

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Posted on Jan 02, 2017

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Replaced alternator but still not charging


What is year--make--model? I can't look up wiring for your charging system w/o more info?
Do you have voltage at alternator bat terminal, key off? If nothing there, may be problem with wiring circuit or fusible link to battery. Also, most alternators need excite voltage or they won't work. If problem with wiring circuit to or from alternator, replacing the alternator won't fix it.
Some makes and models may have trouble codes for charging system, any applicable trouble codes?

Mar 23, 2016 | Cars & Trucks

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The battery is not charging and is bringing up codes P0621 and P0622 indicating a generator field circuit problem. Is this fixable? What do I do?


The alternator is fielded/grounded by the PCM. You need wiring schematics. Check continuity between the alternator and PCM for the field wire. If it is good, the PCM has lost the ground for the alternator(if not, fix or run a new wire). You can fix it two ways. First replace the PCM and have it programmed to the car. This cost money and it will turn the battery light off. Second, is to cut the field wire close( give yourself room to work) to the alternator, add wire to it and ground it to the engine(making sure the engine has a ground strap to the body). This may or may not turn the battery light off. But it will charge the battery.

May 21, 2015 | 2002 Oldsmobile Alero

2 Answers

New alternator and battery but still drains battery and dies while driving.


Possibly a bad fuse which is not allowing the power from your new alternator to make it back to the battery. Do you have alternator voltage making it to the battery when running?

Mar 16, 2014 | Volvo 240 Cars & Trucks

1 Answer

Alternator ground wire


Well they are not ground wires.
The green wire goes to the engine computer and the green orange wire goes to the ASD relay. The engine computer controls voltage.
Both wires "turn on" the alternator once the engine starts. You may need a shop manual to diagnose the problem.

Mar 12, 2014 | Chrysler PT Cruiser Cars & Trucks

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

1 Answer

Alternator on montero melted the wire and almost welded itself to the alternator i need to re wire the alternator and need to know what all wires i need to check and replace i need this fixed asap for it...


WHAT COLOR WIRES MELT TO ALTERNATOR ONE WHITE WIRE BATTERY FEED FUSE LINK WIRE OR THE WHITE AND BLUE WIRE TO VOLTAGE REGULATOR TO COMBINATION METER. WHEN YOU REPLACE ELECTRICAL WIRES BESURE TO PUT FLEXIBLE CONDUIT AROUND WIRES TO KEEP ENGINE HEAT AWAY FROM WIRES AND CONDUIT WILL KEEP WIRES FROM RUBBING CAUSING SHORT TO GROUND.

Jul 27, 2011 | 1999 Mitsubishi Montero Sport

3 Answers

Alternators not charging changed alternator and battery checked main power wire its good where does the small red and green wire go to off the voltage regulator


the red wire is the power, the grren wire is your signal wire. the green wire sends the signal from the regulator to the ecm to tell it when to cycle the alternator on and off. you could have a faultyy regulator or signal wire causing the malfunction. the wires join the main harness after the regulator.

Apr 05, 2011 | 1999 Mercury Cougar

1 Answer

Hi trying to replace my alternator 2 wires and 1 big stud on it,but this new alternator got 3 wires and a big stud.just can,t figure out how to fix.please help.


The extra wire is likely a ground wire that goes to the engine block. You can add a wire to the engine block Using a test light ,the wire that lights when touching the shell of the alternator and the wire with the other lead is the(extra) ground wire.

Jun 24, 2009 | 2006 Suzuki Forenza

1 Answer

1996 infinit q45 alternator vs battery sparking


Sounds like you have reversed the wires going into the back of the alternator. Contact the dealer, or go in and have them show you which wire goes where.

Jan 23, 2009 | 2004 Infiniti Q45

2 Answers

Bad wiring to alternator


I need more information please, bad wiring... not enough will need to know more, such as, The wires to the alternator are bad, previous owner did a bad wiring job to the alternator, or i messed up the wiring to the alternator and need some advice.

Jul 30, 2008 | Toyota T100 Cars & Trucks

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