I must be missing something; I have verified that the belt is tight, the battery connections are good, the ground is good, all fuses are good, and the battery itself is good. I have removed the alternator and had it verified by 2 separate auto parts stores (who normally want to sell you an alternator, if they can), but still I do not get more than 12 VDC across the battery posts while the engine is running. I have done everything my manual directs which continues to say that the voltage regulator section of the alternator is bad. There is an integrated control unit above the driver's side fuse box which connects to the alternator plug (not the main power wire). This is the only item I see which could possibly ben an influence. Anyone ever had such an issue?
The battery voltage is supposed to be 12 volts. You will only get a higher voltage right after starting the vehicle, which uses some of the energy in the battery causing the alternator to sense the need to re-charge it. During re-charge the voltage will be in the 14 volt region. As the battery is becoming fully charged, the alternator senses that and reduces it's output voltage gradually down to 12 volts.
You didn't state why you think you have a problem other than referring to something in the manual. If the vehicle starts and runs fine, keeping a steady 12 volts while running, then that is perfectly normal. Be happy.
SOURCE: 1985 Ford Bronco.....alternator will not charge
MY NA ME IS MAGICBROOM58, HAVE YOU TRIED .. I THINK IT'S ON THE FIRE WALL PASS. SIDE (CILINOID) TAKE THE RBBER OFF THE POS. AND TURN YOUR EGNITION OVER TO THE ON POS. GO BACK UNDER YOUR HOOD AND TAKE A RUBBER HANDLED WRECH?SCREW DRIVER AND CONNECT THE 2 POINTS IF IT TURNS OVER U FOUND YOUR PRBLEM
SOURCE: replaced alternator on 1985 Ford Bonco 4X4 302
turn your vehicle on, disconnect the battery, both terminals(while truck is still on) if it dies on you, then either the alternator is bad or wiring is wrong. if it stays on, then you may have a bad battery or voltage regulator. Check the voltage on the battery before you turn it on(should be from 11.5v-12v), when you turn it on if the alternator if working properly you should have around 13v-14v.
Testimonial: "This was helpful, but I did not post that I had already performed this check."
SOURCE: 1979 Ford Thunderbird alternator not charging
Are the connections really dirty at the voltage regulator? These tend to get corrosion on them and cause weird charging system issues. Also make sure the ground is good on the regulator.
SOURCE: Will not charge
you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME
SOURCE: 1982 Dodge W150 truck (6 cyl.)wiring problem
I do not know about that,but make sure the large wire on the alternator is going to the positive cable on the battery.
179 views
Usually answered in minutes!
×