PROBLEM with battery light on dash ?
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Senior User
Joined: Apr 2011
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PROBLEM with battery light on dash ?
Have a 2004 250 super duty extended 6 3/4 cab four wheel drive 5.4 v 8 gas engine. Problem ,three tuff starts yesterday , dead last night, charged this morning it started was driving to dealor to have battery replaced she died before I got there. I ended up putting new battery from auto zone, it started and runs fine ( problem battery light still on ) went back to auto zone they checked startinging system and alternator out put, they said something is wrong. I can get a new alt. from ford ( my broth. price he has auto body shop ) $ 191.00 plus tax Im thinking do the job myself NOT SURE IF it could be something else! Dont want to replace if not necc. any other item that could cause a battery light on dash to come on ? Trying to save some $ , work is slow, suggestions please ?
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 25
From: Chino, California
Get a multi-meter and set it volts. When the engine hasn't run for a while, check the voltage on the battery on the posts. Now put the + probe on the big wire on the alternator. It should be the same. If not, you may have a bad connection from alt to battery. Check your ground also.
Start the engine and measure it again on the alternator. It should be about 13.8V. If not, your alt is bad.
Start the engine and measure it again on the alternator. It should be about 13.8V. If not, your alt is bad.
Thread Starter
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Senior User
Joined: Apr 2011
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Have a 2004 250 super duty extended 6 3/4 cab four wheel drive 5.4 v 8 gas engine. Problem ,three tuff starts yesterday , dead last night, charged this morning it started was driving to dealor to have battery replaced she died before I got there. I ended up putting new battery from auto zone, it started and runs fine ( problem battery light still on ) went back to auto zone they checked startinging system and alternator out put, they said something is wrong. I can get a new alt. from ford ( my broth. price he has auto body shop ) $ 191.00 plus tax Im thinking do the job myself NOT SURE IF it could be something else! Dont want to replace if not necc. any other item that could cause a battery light on dash to come on ? Trying to save some $ , work is slow, suggestions please ?
Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
Get a multi-meter and set it volts. When the engine hasn't run for a while, check the voltage on the battery on the posts. Now put the + probe on the big wire on the alternator. It should be the same. If not, you may have a bad connection from alt to battery. Check your ground also.
Start the engine and measure it again on the alternator. It should be about 13.8V. If not, your alt is bad.
Start the engine and measure it again on the alternator. It should be about 13.8V. If not, your alt is bad.
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Senior User
Joined: Apr 2011
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It was the alternator, had it replaced along with serp. belt, if I still have truck prob. do it myself next time. THANKS FOR HELP !
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