Brand new alternator,got the battery checked it fairly new,checked all wires.The truck says it is charging but the battery light still comes on.Have reset system on dash ,did not correct. All the part alternator battery etc check out on machine.I know i am missing something just do not know what?
You have to drive it to charge the battery back up or put it on a charger
SOURCE: battery wont charge
i had this exact same problem ... under the hood onthe left side of the firewall where your starter solenoid and fuseable links are there is a little container type thing that holds a 20 amp fuse that fuse is probably blown the little container is on the firewall right below the fuseable links
SOURCE: 2005 ford f350 diesel charging system
take the termanals off and look inside them. Use coke to clean them.
SOURCE: replaced the battery and the alternator in 2006 ford taurus
check the alternator fuse and grounding
SOURCE: Instrument panel went dead
Checked Every fuse in the fuse box (no small task).This includes #4 - Power point Instrument Panel, #14 - Day time running lamps (auto lamps doesn't work nor does auto lock), #27 - ignition switch run feed, #35 - Instrument Cluster, #41 - Instrument Cluster, #42 - Delayed Accessory, #45 - Ignition switch run/start feed, #102 - Door locks body security module, #103 - Ignition switch, #110 - Ignition switch, & #116 - Ignition switch. But I also check all other ones as well, they all register OK. AC panel & radio work. Turn signals work. Mileage does not work, trip computer does. So, basically, everything works except auto head-lights, auto locks, and the dash cluster (no MPH, RPM, mileage display, Fuel, Temp, Tran Temp, and Oil Pressure).
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.
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