Question about 2005 Ford F 350 Super Duty

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Replaced batteries-started truck voltage was 12.8 in both batteries and climbed to 14.3- went to work- today start truck battery voltage was 12.6 and dropping battery light does not come on-ABS, WRENCH LIGHT, CHECK ENG. LIGHT COMES ON- NO CODES-checked grounds, all plugs can't find nothing. if it was alternator the battery light should come on and is there an easy way to check, Thanks

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  • Ford Master
  • 77,939 Answers

Does the battery warning light prove out when key is first turned on?

Posted on Jul 28, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 2004 Ford f350 Diesel battery problem

check the fuse for the alt. power supply box under the hood should be a big fuse

Posted on Dec 04, 2008

  • 27 Answers

SOURCE: battery light on.

some ford vehicles have an external voltage regulator. when theres more demand for power it gives it. but when theres too much itll lower it so it does not overcharge. at 1600 rpms there is more demand, plugs firing with more fuel in the cyl, if the alt is working properly the regulator could mess up and stop power from the alt. its a cheap fix or tryout...another big problem is ground if the system does not have an adequate ground nothin would work as it should.

Posted on May 11, 2009

  • 14036 Answers

SOURCE: I replaced the alternator and the battery in my 97 Town & Country

check fuse and fuse alternator is not receiving power .you have a open fuse or fuse link.alternator need battery power in order to charge battery.

Posted on Jun 12, 2009

  • 6927 Answers

SOURCE: My 7.3 L diesel ford

You must have an older vehicle,but I am pretty sure the 7.3 was put out after the voltage regulator was put in the alternator.What you are describing is a voltage regulator on the the firewall.If this is so,replace the voltage regulator on the firewall,with a new one.This will be the problem most likely.The voltage regulator on the firewall should be kind of flat,almost square,and a wide plug,goes all the way across the voltage regulator.If You don`t have external regulator,then it is built in the alternator,and the alternator you purchased is bad.Be sure the wires on the back of the alternator are not broken anywhere.The big post ,largest wire,on the back of the alternator is the out put wire.It should go to the battery.If it does not have 13.65 to 14.25 volts on the back of the alternator,and at the battery positive post.Like I said,I believe the voltage regulator is on the firewall,if it looks like I described,then it is a regulator,replace this part(voltage regulator)and it will solve your problem.I hope this was some help,please let us know,thank you.

Posted on Oct 16, 2009

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SOURCE: battery light ford 2003 escape battery died short in main ig.

yes , repair the alternator

Posted on Jul 30, 2010

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Sounds like a dead battery which will have a small surface charge after sitting.. check the battery voltage with a voltmeter (cheap tool from Harbor Freight) should be 12 v or higher.. if voltage is below 12v either the battery is bad or the power from the alternator is not getting to the battery.. The easy things would be a cooroded battery cables, loose battery cables, at either the battery the starter or where the ground cable connects to the frame. Jump the car to get it running, check the output from the alternator.. usually red wire.. should be about 13v -14+v. now check the voltage at the battery.. should be the same 13v - 14+v if you do not have this voltage coming out of the alternator with the engine running the alternator is probably bad.. If the power is commning from the alternator but not getting to the battery trace the wire from the alternator and look for the short . post a comment here and let us know what you find.

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Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

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1 Answer

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Even a new battery will go dead if the car is running on the battery instead of the alternator.
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