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1999 Ford ranger charging problem

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04 Aug 2019 23:35 #32485 by Carfreek
1999 Ford ranger charging problem was created by Carfreek
I just had a battery go bad and replaced it. Now the ranger only charges 11.9 volts. Does anyone have a diagram of the charging system. Was told a battery going bad could damage a alternator
Thanks

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05 Aug 2019 07:12 #32501 by Chad
Replied by Chad on topic 1999 Ford ranger charging problem

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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05 Aug 2019 11:56 #32507 by Carfreek
Replied by Carfreek on topic 1999 Ford ranger charging problem
Thank you. Is it possible to have a good alternator charging 2 volts low from bad battery connections or corroded connections at alternator. Does voltage at I terminal turn regulator on and off?

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05 Aug 2019 18:08 #32513 by Cheryl
Replied by Cheryl on topic 1999 Ford ranger charging problem
Sounds like a voltage drop issue. You have a multimeter go from battery negative to alternator case should see below .2 of a volt. Then go from battery positive to alternator battery cable stud. Should see below .5 Volts

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05 Aug 2019 18:10 #32514 by Chad
Replied by Chad on topic 1999 Ford ranger charging problem

Carfreek wrote: Is it possible to have a good alternator charging 2 volts low from bad battery connections or corroded connections at alternator.

I would say "Not likely". :unsure: Someone will correct me if I'm wrong. If you had a bad/corroded connection at Terminal A (YEL/WHT), you might see less voltage than the alternator is really producing.

Does voltage at I terminal turn regulator on and off?


No. Terminal "A" (YEL/WHT) is the voltage sensing circuit. All the "I" terminal does is control the warning light in the instrument cluster. Power comes from the battery, through fuse 15, to the warning light. When the alternator is charging, it also sends power to the bulb on the "I" terminal (lt grn/red). Receiving power from both sides (the bulb), the difference in potential is near zero, so the bulb does not light. But when the alternator is NOT charging, The "I" terminal will be near zero volts (ground). Now, there is enough difference in potential across the bulb for it to light.

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"Understanding a question is half an answer."

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05 Aug 2019 18:16 #32515 by Cheryl
Replied by Cheryl on topic 1999 Ford ranger charging problem
Are you talking about this specific setup? Or is it possible for any alternator to not charge from connection issues. That’s what I thought you were asking

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05 Aug 2019 20:42 #32521 by Carfreek
Replied by Carfreek on topic 1999 Ford ranger charging problem
My truck has the volt meter in dash no light

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05 Aug 2019 21:08 #32523 by Chad
Replied by Chad on topic 1999 Ford ranger charging problem

Cheryl wrote: Sounds like a voltage drop issue. You have a multimeter go from battery negative to alternator case should see below .2 of a volt. Then go from battery positive to alternator battery cable stud. Should see below .5 Volts


I would test as Cheryl suggested. If you have no voltage drop, and the system voltage is low, it is safe to say the alternator is not charging. Check for battery voltage at Terminal "A"

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"Understanding a question is half an answer."

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