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Battery Light on 03 Ford Focus- Everything Replaced
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texaskreek06
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Sep 12, 2008, 2:13 PM
Post #1 of 15
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Battery Light on 03 Ford Focus- Everything Replaced
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I have a 2003 Ford Focus Se sedan with 97,000 miles and a 4cyl engine & automatic transmission. I have had the battery, alternator, & belt replaced on this vehicle because the engine light randomly comes on sometimes. Sometimes the alternator is overcharging the system, maybe causing the light. I had it at the Ford house yesterday and they spent all day trying to get the light to come on and trying to get it to do something abnormal. I think the new alternator quit the overcharging, but I can't seem to shake the light which is very annoying when it randomly comes on. Any ideas why or what could be done. Is there any fuse I can pull that will turn the light off? Any help would be greatly appreciated!
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way2old
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Sep 12, 2008, 3:33 PM
Post #2 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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Which light? Is it the check engine light? Or is it the battery or charging light?
Being way2old is why I need help from younger minds
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texaskreek06
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Sep 12, 2008, 4:00 PM
Post #3 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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It is the Battery light, the check engine light has yet to come on
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way2old
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Sep 12, 2008, 5:41 PM
Post #4 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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Check the wiring connections on the alternator. A loose wire can cause your problem
Being way2old is why I need help from younger minds
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texaskreek06
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Sep 13, 2008, 7:21 AM
Post #5 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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The wiring looks good, and has a good connection. My mechanic also said that the regulators on these vehicles are not with the alternator, but are controlled by the computer? I believe, some sort of computer anyways. Do you think flashing the computer would do anything? He was lead to believe that the regulator was not working properly, but had no way to adjust it because it was run by the computer.
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way2old
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Sep 13, 2008, 11:12 AM
Post #6 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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The voltage regulator is internal to the alternator. If the light comes on randomly, there is more than likely a wiring issue somewhere. It is hard to pinpoint where the problem may be since it is intermittent.
Being way2old is why I need help from younger minds
(This post was edited by way2old on Sep 13, 2008, 11:26 AM)
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texaskreek06
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Sep 13, 2008, 11:15 AM
Post #7 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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No link. What is the best way to go about finding a wiring issue?
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way2old
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Sep 13, 2008, 11:32 AM
Post #8 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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Wiring diagram, multimeter and wiggling wires. If this comes through for you, it is directly from Ford's manual.
PINPOINT TEST A: THE CHARGING SYSTEM WARNING INDICATOR IS ON WITH THE ENGINE RUNNING
Test Step Result / Action to Take A1 CHECK THE BATTERY - Carry out the Battery — Condition Test to determine if the battery can hold a charge and is OK for use. REFER to Section 414-01.
- Is the battery OK?
Yes
GO to A2.
No
INSTALL a new battery. REFER to Section 414-01. TEST the system for normal operation. A2 CHECK FUSE 10 (10A) (All except PZEV), (1A) (PZEV) - Check fuse: Fuse 10 (10A) (All except PZEV), (1A) PZEV) in the Battery Junction Box.
- Is the fuse 10 (10A) (All except PZEV), (1A) (PZEV) OK?
Yes
GO to A3.
No
INSTALL a new fuse. TEST the system for normal operation. If the problem persists, check for a short to ground. A3 CHECK THE CHARGING SYSTEM - Carry out the Load Test using the diagnostic tool.
- Is the generator output OK?
Yes
DIAGNOSE the charging system warning indicator. REFER to Section 413-01.
No
GO to A4. A4 CHECK THE GROUND INTEGRITY - Key in ON position.
- Measure the voltage between the generator housing and the negative battery terminal.
 - Is the voltage less than 0.5 volt?
Yes
GO to A5.
No
CLEAN and TIGHTEN the generator mounting, engine-to-body ground strap, and battery ground cable. TEST the system for normal operation. If the concern persists, INSTALL a new battery ground cable. REFER to Section 414-01. A5 CHECK BATTERY CABLE - Key in ON position.
- Measure the voltage between the generator C102c B+ terminal circuit 30-BA6 (RD) and the positive battery terminal.
 - Is the voltage less than 0.5 volts?
Yes
GO to A6.
No
CLEAN and TIGHTEN the positive battery cable connections. TEST the system for normal operation. If the concern persists, INSTALL a new positive battery cable. REFER to Section 414-01. A6 CHECK BATTERY FEED TO THE GENERATOR - Measure the voltage between the generator C102c B+ terminal, circuit 30-BA6 (RD), harness side and ground.
 - Is the voltage equal to the battery voltage?
Yes
GO to A7.
No
REPAIR circuit 30-BA6 (RD) or circuit 30-BB10 (RD). TEST the system for normal operation. A7 CHECK POWER TO THE VOLTAGE REGULATOR - Key in OFF position.
- Disconnect: Generator C102a.
- Measure the voltage between the generator C102a pin 3, circuit 30-BA10 (RD), harness side and ground.
 - Is the voltage greater than 10 volts?
Yes
GO to A8.
No
If fuse 10 (10A) (All except PZEV), (1A) (PZEV), is OK; REPAIR circuit 30-BA10 (RD). TEST the system for normal operation. A8 CHECK POWERTRAIN CONTROL MODULE AND COMMUNICATIONS LINK WITH GENERATOR - Connect: Generator C102a.
- Connect the diagnostic tool.
- Key in ON position.
- Retrieve PCM diagnostic trouble codes (DTCs).
- Are any DTCs retrieved?
Yes
Use the diagnostic tool to diagnose the PCM and communications.
No
INSTALL a new generator. REFER to Section 414-02. TEST the system for normal operation.
Being way2old is why I need help from younger minds
(This post was edited by way2old on Sep 13, 2008, 11:33 AM)
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texaskreek06
User
Sep 13, 2008, 11:35 AM
Post #9 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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The links are dead, but this looks helpful if I could get a good link
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way2old
Veteran
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Sep 13, 2008, 11:37 AM
Post #10 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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You will not get a link unless you subscribe to the website. All the links ao is just show how to remove parts.
Being way2old is why I need help from younger minds
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texaskreek06
User
Sep 13, 2008, 11:44 AM
Post #11 of 15
(43512 views)
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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Well I'll fool around with it and see if I can stumble across anything. Electrical is way out of my league. Thanks for all the help. This is a great forum.
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Guest
Anonymous Poster
kfelling@uca.edu
Jun 19, 2009, 7:56 AM
Post #12 of 15
(42663 views)
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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I have this exact same problem. Dealership can't find anything wrong. However, today was driving and my entire dash went dead. Something electrical definitely wrong on my 03 Focus. Waiting for a tow truck right now. Let me know if you found out what was wrong,
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 19, 2009, 8:54 AM
Post #13 of 15
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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This thread is a year old. You need to start a new question of your own if you want a response.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Guest
Anonymous Poster
patters85@aol.com
Jul 20, 2009, 1:44 AM
Post #14 of 15
(42434 views)
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Re: Battery Light on 03 Ford Focus- Everything Replaced
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I'm having the same problem also. I was told that the computer regulates all charging. And it decides when the alternator is bad. When the red battery light comes on, it is an indicator, followed by the check engine light. I had my alternator bench tested and it showed 14.5v under a load. I was also told that the wire going from the starter to the alternator acts as a fuse. as long as it shows less than 5 ohms it is good. I have to decide if I will replace the alternator anyway or let the dealer search for a problem. I think I will start by changing the alternator and hoping for a refund if it is something else. Good Luck...
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