WEIRD Battery light on, but no problems...? - Page 3 - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace



Go Back   Focus Fanatics > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
FocusFest Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 09-10-2010, 12:57 PM   #21
Adventure-Biker
Focus Rookie
 
Join Date: Oct 2007
Fan#: 51271
Location: Florida
What I Drive: 2003 Black ZTW with all the options

Posts: 23
FF Reputation: 1 Adventure-Biker Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by sailor View Post
Posted via FF MobileSeems like the current problem is a lower than normal Idle RPM. Mine Idles at about 900 when warm, and readjusts to that when A/C is engaged (pops higher then settles down) so that seems like the normal speed for idle. If the IAC seems to be responding normally you may have a vacuum leak or other cause for low idle.... Others may know your normal idle, I can`t see your model info on Mobile, just guessing that all models have similar std. Idle RPM....
I have a wagon with the Zetec engine. I got this car brand new and the idle speed as always been around 700rpm from day one (after warm-up). Of course the idle from a cold start is a little higher (somewhere around 1000-1100). I'm assuming the idle air control is working correctly- with the air conditioner on the idle speed doesn't increase but pretty much stays constant around 700rpm (even if the electric fans are on out front).

Like I said, the car has always worked like this. I never had any low charging output issues at idle with the OEM alternator.

The missus has the same car as I do (SE wagon), only one year older, less factory options, and with quite higher mileage. Same Zetec engine however. Her's idles at around 700rpm after warm up also. I checked charging voltage on her car at idle yesterday (no lights or other electrical stuff on) and it produces a good 14.0-14.2v, at idle. Then I turned on everything I could possibly turn on- lights, heater blower, front and rear windshield wipers, rear defogger, interior vanity lights, radio, and the car still produced well over 13.2v at idle- still more than enough to charge the battery.

So I am left to conclude that the Bosch H.O. I put in my car won't really work unless I am driving at least 1000rpm, which is definitely on again, off again in city driving (NOT good for the battery). And with the amount of electrical load I put on my car, this is a problem :(
__________________
>> 2003 ZTW Wagon with all the options, black exterior, tan leather interior. 100% stock. I love this car!
>> 2012 Ellsworth mountain bike (my other "car")
>> YouTube.com/user/TheAdventureBiker
>> YouTube.com/user/GuessThisPrice
Adventure-Biker is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 09-10-2010, 01:12 PM   #22
Adventure-Biker
Focus Rookie
 
Join Date: Oct 2007
Fan#: 51271
Location: Florida
What I Drive: 2003 Black ZTW with all the options

Posts: 23
FF Reputation: 1 Adventure-Biker Good Standing Member
Buy-Sell-Trade Rating: (0)
One more thing...

I'm wondering if there are any unseen issues with the battery itself? I installed this battery new less than 12 months ago and to this day I have never had any issues with the battery itself, but due to the recent alternator failure I had this caused the battery to go completely dead on about 3-5 occasions.

I know this can be detrimental to any lead acid battery. The hot climate I live in probably makes matters worse. The battery still starts the car fine and accepts a slow charge from my WalMart charger. After charging it reads a good 12.68-12.8v although this could possibly just be a 'surface charge' reading???

Any ideas whether I should replace the battery? It was just a low cost replacement to begin with but I'd rather not buy another battery right now if I can help it.

One thing I remember is that my alternator failed a few years ago at around 40k miles while the car was still under factory warranty. Rather than fiddle with it myself I took the car to the dealer (considering that the warranty was still in effect). Before taking it to them I verified little or no charging output myself. They replaced the alternator- and ALSO the battery. Prior to that I never had any issues directly related to the battery but they replaced it anyway- I was only expecting them to replace the alt. This has me wondering if my present battery has some unseen fault and should be replaced.
__________________
>> 2003 ZTW Wagon with all the options, black exterior, tan leather interior. 100% stock. I love this car!
>> 2012 Ellsworth mountain bike (my other "car")
>> YouTube.com/user/TheAdventureBiker
>> YouTube.com/user/GuessThisPrice
Adventure-Biker is offline  
    Reply With Quote
Old 09-10-2010, 02:00 PM   #23
sailor
"Elder"
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 11,638
FF Reputation: 60 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Posted via FF MobileProb should have run mine longer for a fully warm reference, but it ran recently so not really "cold". 6-700 isn`t unusual as a low idle speed, just didn`t know your "normal" in the past! In my case I can`t remember right now as I didn`t pay close attention (working OK, so you don`t check too close) Duratec normal & Zetec normal may be different anyways..... `fraid I`ll have to recheck my "normal" in a bit for a better reference, 700 does sound right for an automatic when in gear, 6-700 is my memory for "normal" in that case when fully warmed up.... Good output at idle is the whole point to alternators, as opposed to old time generators, interesting that you get a dramatic increase in output between 700 & 900. I`ll get back when I recheck idle after fully warm when driven.... maybe get out the voltmeter for another reference set of #`s.
sailor is offline  
    Reply With Quote
Old 09-10-2010, 03:28 PM   #24
sailor
"Elder"
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 11,638
FF Reputation: 60 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Posted via FF MobileOkay, after a drive to warm up I`m getting 14.5 volts at about 700 rpm, so the higher idle was due to not fully warm & output is OK at low rpm - no help, but a better reference than my false idle #`s.
sailor is offline  
    Reply With Quote
Old 09-11-2010, 03:30 AM   #25
Adventure-Biker
Focus Rookie
 
Join Date: Oct 2007
Fan#: 51271
Location: Florida
What I Drive: 2003 Black ZTW with all the options

Posts: 23
FF Reputation: 1 Adventure-Biker Good Standing Member
Buy-Sell-Trade Rating: (0)
So I installed a new battery today. Luckily my old one was still under the 2 year warranty so the new one was an even exchange and didn't cost me a cent out of pocket.

Brought it home, put it on the trickle charger (who knows how long it sat on the shelf at the store), let it fully charge, and then installed it on the car. With the car turned off battery voltage read 12.85v. Start car (engine warm, no lights or accessories on) and charging voltage is still under 13v at idle. Turned on lights and everything electrical I could turn on and charging voltage falls below 12.6v at idle.

Voltage quickly climbs to 13.5-13.6v with everything electrical ON at about 900-1000rpm. Same RPM with everything turned off yields about 14.6v

I guess this H.O. alternator I bought really does have to spin at a higher RPM before it does anything :(
__________________
>> 2003 ZTW Wagon with all the options, black exterior, tan leather interior. 100% stock. I love this car!
>> 2012 Ellsworth mountain bike (my other "car")
>> YouTube.com/user/TheAdventureBiker
>> YouTube.com/user/GuessThisPrice

Last edited by Adventure-Biker; 09-11-2010 at 10:41 AM.
Adventure-Biker is offline  
    Reply With Quote
Old 09-12-2010, 02:19 AM   #26
sailor
"Elder"
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 11,638
FF Reputation: 60 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Posted via FF MobileShucks..... well keep an eye on it, should charge enough to be OK as it`s at least maintaining battery voltage at idle with a load - not dropping below to indicate a draw on the battery at idle. And it charges fine once off idle to recharge the batt. from starting loads... Not tragic, just won`t recharge appreciably at idle...
sailor is offline  
    Reply With Quote
Old 09-12-2010, 06:58 AM   #27
Usagi
Focus Enthusiast
 
Usagi's Avatar
 
Join Date: Apr 2009
Fan#: 64712
Location: Newport News, Va, VA
What I Drive: 2002 SY ZX5

Posts: 496
FF Reputation: 4 Usagi Good Standing Member
Buy-Sell-Trade Rating: (1)
Last time i saw numbers like that, my alternator was breathing its last. Then again, the low voltage at idle was accompanied by the requisite "moan" alt's tend to make when they die...
__________________
2002 Focus ZX5 in Zinc Yellow: Steeda Strut Bar, Tom's Tune, Volant CAI with Aux Pipe Extension, SVT suspension, and ST200's.
Usagi is offline  
    Reply With Quote
Old 08-10-2011, 09:41 AM   #28
sham63
Focus Rookie
 
Join Date: Aug 2011
Fan#: 88707
Location: Columbus, OH
What I Drive: 2000 Red Wagon SE

Posts: 2
FF Reputation: 1 sham63 Good Standing Member
Buy-Sell-Trade Rating: (0)
Kind of late for the original poster, but I just had the same issue of the battery light being on for no reason. My battery is only a year old, and the alternator is outputting 14.4v. The cause for my car was fuse 10 in the fuse box under the hood. It is for the battery sensor, diagnostic plug. The fuse was blown, put in a new one and the light went out. I wonder if it blew because my drivers side lock actuator went out and blew the fuse for that. It caused the dome light to dim a lot, and the others doors unlocked real slow. I need to get an actuator and replace it.
sham63 is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:15 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.