Question about 1987 Ford F 250

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Voltage Problem Hi, I'm having a problem with the fact my truck wont charger the battery, alternator, battery, cables all new. it just wont sent the volts back tothe battery.. Also when you turn the key to the on position the battery doesnt come on anymore, Could this be one of the problems also? NEED HELP..

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Hello
this style of alt has an internal regulator and these alt. have had a long history of the wiring plug burning up. the one that plugs into the alt. and have started some fires so be careful.
this alt is called a 2G
most auto part houses will have replacement harnesses

Posted on Oct 26, 2008

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Replaced battery and alternator it still wont start unless charger is on boost then runs for 10 min then dies wont restart unless battery charger on it again?


Either the battery is a dud, (cant retain a charge) or the alternator is not charging possibly due to a wire not connecting or wires incorrectly connected or both. Check voltage at the alternator (large terminal) without motor running, should be around 12 to 13 volts

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I have a 2000 dodge stratus. Battery light was on for two weeks then the gages and radio started to twitch we tested both battery and alternator both have been changed we took it for a test drive...


ok that is NOT a battery light, its a CHARGE light!
it comes on and means the battery is not CHARGING.
(the pcm knows this for a fact, in fact IT turned the lamp on.... a key fact.)
any shop can measure the voltage and tell you that in 5 min flat.
he'd
  1. open hood, measure battery, ah, 11vdc. so he jumper starts engine. it starts (cables removed now)
  2. the meter back to battery terms, and its not 13.3 to 15vdc.
  3. he saw 11v. running. oops. that is WRONG.
  4. so he now knows the alternator is bad, or the alternator hates the battery,(can happen)
  5. on ours we can hot wire the alternator to see it go full on, this is called FULL FIELDING and ALT, i dont teach you that, because you will hurt yourself or car.
  6. The PCM on many cars runs the alternator, in fact there is on inside alt, regulator the PCM does that. so can be bad.
  7. if you had before tested your old battery it would have passed.
  8. if you had tested the old alternate (free in any auto store) it too would have passed, (now they are new) so that leaves wires and and last PCM bad.
  9. your pcm pin C1-8 conrols ALT pin 2. field . at all times.
  10. that wire is dark green.
  11. the alternator is very tricky here( pcm brain side) it will drop the battery charging off line if the battery cables are bad. or any wires related to battery cables, grounds or bad wiring on rear of ALT.
  12. the Same is true if the PCM thinks the battery is shorted or open or has insane internal high resistance. (bad batteries)
  13. for current overload, and for OVER VOLTAGE.
  14. that is about it. there is more, but that is all covered in you missing FSM.

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Start car and unplug battery, if it dies your alternator is dead. Get new alternator. If car keeps running, get a voltmeter and check voltage coming through - should be higher than 12v but less than 18v. Any other number means your voltage regulator is dead, cheaper to get a new alternator.

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A bad voltage regulator could cause the problem. Assuming the alternator is working correctly. Jump the vehicle with the battery disconnected and then disconnect the jumper cables. If the vehicle dies your voltage regulator or Alternator are bad, some vehicle have separate regulators from the alternator, if it continues to run the alternator is good but the voltage regulator is probably the cause.

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Sound like you have a bad alternator, poss bad battery too.If you can jump start it with a volt meter check voltage at battery should have above 13.5 volts, do this after you unhook jumper cables and engine running.If bad voltage reading replace alternator make sure you charge battery before starting engine with new alternator or it could damage alternator.If good voltage have battery check.Hope this helped.

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Hi,welcome to fix ya.
It sounds like you are not getting power to the alternator if it is really god. check the large wire at the post with your meter it should have the same voilage as the battery. if not try cleaning the connections at the battery and check the inline fuse link .

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Hi

If you have a volt meter, set it to volts and hold the negative probe to the alternator body and the positive to the battery positive. If you don't get battery voltage then the alternator isn't grounded and the probable cause is the main engine ground cable either breaking or coming loose.

Very best regards

Geordie

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