Question about 2005 Ford Focus

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Problem with car

My battery light is off for 10 to 15 seconds then stays on the car starts fine and runs but it drains the battery then quits i did volt check at the battary i have 14 volts if i charge the battery runs fine till the battery is dead again so i though the altenator was weak or brushes were worn out so i replaced it still same problem any ideas ??

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Try charging the battery and start the car then disconnect both battery cables and see if the engine keeps running if not alternators got bad rectifiers if it stays running check the fuse link also check the alternator voltage coming out it should be 14.4 or so and use 0000 steel wool to clean connectors at the battery and the ground on the block and any ground straps from the engine to the frame and the connections at the starter and one more thing no vehicle given so check belt tightness if a regular belt 1/4" play if you have a belt tensioner that is adjustable same thing 1/4" play if it's an automatic tensioner stand in front and watch it as someone races the engine if it's moving back N forth and I mean flopping around its bad it should only slightly move when rpms go up not move a lot this means the belt is slipping and not turning the alternator and as you keep driving eventually the battery goes dead post back to me in comments with all checks and progress you're making so we can rule out things done ok good luck and please rate my answer when you can I'm a taxi mechanic with 50 years experience so that's where your info is coming from oh yeah 1 more thing the condition of the belt and pulleys make sure nothing is leaking on to the belt/pulleys and the belt is in good shape also check the pulley grooves for build up of debris grease or belt material this will cause a slipping belt and rpm loss at the alternator so you have some investigations to do and keep a list of everything you did this w a y your not standing saying I think so/or did I do this you must have a positive confirmation of your work done so I can help you also make model and year would be a big help so do these things and I'll look for you tomorrow I'm doing a heater core on a crown victoria and I have to put it back together it goes back out on the street at 4am for the day shift and a another chariot driver in later man

Posted on Oct 31, 2017


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Posted on Jan 02, 2017

  • 957 Answers

SOURCE: battery light on volt gauge is ok new altenator and battery

It is the two or three wire connector on the top side of the alternator. Either a wire has broke before the plug or there is a problem with the plugs terminals. The dealer sells a repair pig-tail if you need it.

Posted on May 03, 2009

  • 1779 Answers

SOURCE: 2000 Windstar no charge light

Check all connections to alt. and battery to make sure they are clean and tight, as it sounds like a loose or dirty connection someplace. Possibly something not tightened completely after battery and alt. replaced? (just enough to get the annoying light to go on occasionally)

Posted on Jul 29, 2009

  • 571 Answers

SOURCE: 2006 Ford Foucs battery light. New alernator, good battery

Your fear is probably right. Get it checked before any major overhaul.

Posted on Nov 26, 2009

  • 11 Answers

SOURCE: I have a 2006 ford focus. The battery light

I have the same problem Screw napa the can't tell the differance at least not in Georgia. They said it was the battery. Anothe machanic said it's not the altornator either could be a wiring or computer problem. I think I 'll try to trade it in

Posted on Feb 10, 2010

  • 158 Answers

SOURCE: 2006 sel awd on third

you definatly have a grounding issue, I would look at all of your wiring underneath especially what is exposed to the elements.

Posted on Mar 24, 2011

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