07 5.4 died while driving
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Senior User
Joined: Jul 2004
Posts: 247
Likes: 3
From: Illinois
07 5.4 died while driving
Driving down the road
first I notice the ABS light is on
Then ABS light goes off and all the gauges drop to nothing
Then about 2 miles more and truck shuts down
all power is lost
I hear a clicking sound coming from under the truck
I unhook battery and reconnect no more clicking till I turn the key
Any thoughts
first I notice the ABS light is on
Then ABS light goes off and all the gauges drop to nothing
Then about 2 miles more and truck shuts down
all power is lost
I hear a clicking sound coming from under the truck
I unhook battery and reconnect no more clicking till I turn the key
Any thoughts
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Senior User
Joined: Jul 2004
Posts: 247
Likes: 3
From: Illinois
Ok after leaving the battery disconnected for 10 minutes.
I decided to hook it up and see if I could determine where the clicking is coming from
Hooked up battery
Turned key to on
Got dash power
Turned key to start and lost it all again
Oh and no clicking this time
I decided to hook it up and see if I could determine where the clicking is coming from
Hooked up battery
Turned key to on
Got dash power
Turned key to start and lost it all again
Oh and no clicking this time
Thread Starter
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Senior User
Joined: Jul 2004
Posts: 247
Likes: 3
From: Illinois
Ok battery disconnect again for 5 or so minutes
reconnect
Turn on key
Power to dash
Leave key on, don't try to start, power goes off after maybe 1 minute.
I know it's electrical but
reconnect
Turn on key
Power to dash
Leave key on, don't try to start, power goes off after maybe 1 minute.
I know it's electrical but
New User
Joined: Nov 2011
Posts: 15
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From: Chicago
Alternator is shot. Just had this happen to me. Died in front of house. Called tow as it wouldn't restart. Tow arrives and he says try to start. Started up and he drove it on to flatbed to take to shop for R & R of alternator. It was cold and snowing so I didn't want to do it.
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From: Chicago
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Elder User
Joined: Aug 2018
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From: Riverbank, CA.
When did you purchase the new battery? How long has it been in your truck? Once the truck starts, it shouldn't need the battery to run. The alternator takes over and supplies the current needed. The battery is really just to kick the starter motor over and power up the needed electrical components until the motor is turning and the alternator is suppling power.
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Senior User
Joined: Jul 2004
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From: Illinois
I was thinking that too, shouldn't need battery once running.
I swapped batteries and I'm getting 13.8 volts While running.
Battery in question was reading 10.1 volts.
Been on the charger for 3 hours now, I'm going out to test it right now.
Battery was new in December, worked great during sub zero temps couple weeks ago.
I swapped batteries and I'm getting 13.8 volts While running.
Battery in question was reading 10.1 volts.
Been on the charger for 3 hours now, I'm going out to test it right now.
Battery was new in December, worked great during sub zero temps couple weeks ago.
Elder User
Joined: Aug 2018
Posts: 579
Likes: 6
From: Riverbank, CA.
I was thinking that too, shouldn't need battery once running.
I swapped batteries and I'm getting 13.8 volts While running.
Battery in question was reading 10.1 volts.
Been on the charger for 3 hours now, I'm going out to test it right now.
Battery was new in December, worked great during sub zero temps couple weeks ago.
I swapped batteries and I'm getting 13.8 volts While running.
Battery in question was reading 10.1 volts.
Been on the charger for 3 hours now, I'm going out to test it right now.
Battery was new in December, worked great during sub zero temps couple weeks ago.
Thread Starter
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Senior User
Joined: Jul 2004
Posts: 247
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From: Illinois
I have a battery load tester and charging system tester
I just tested the battery at 95% charge and it tests good
so I swap it back into the truck and it starts right up and IS NOT charging, reading 12.4volts and dropping
SO I guess I'm taking the alternator in for a bench test
I tested the charging system when I got it home with the donor battery and all tested good.
intermitant alternator?
I just tested the battery at 95% charge and it tests good
so I swap it back into the truck and it starts right up and IS NOT charging, reading 12.4volts and dropping
SO I guess I'm taking the alternator in for a bench test
I tested the charging system when I got it home with the donor battery and all tested good.
intermitant alternator?
Elder User
Joined: Aug 2018
Posts: 579
Likes: 6
From: Riverbank, CA.
FTE Community Team
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FWIW sometimes the alternator can't keep up with some surge loads while the battery can. I've seen a bad battery and corroded terminals cause cars to stall at low engine speed in gear as brakes are applied. The brake lights drop the voltage just enough without the battery catching it. Same cars in Park with nothing changed and brake lights might get a minor drop in RPM but not enough to stall without the drag of the torque converter, then the alternator has a bit more time to catch it.