Question about 1995 Pontiac Sunfire

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93 Ford F250 5.8 L No Charge

Ive tested the wires getting the right voltage from all 3 wires that plug into the Alt Checked all fuseable links all good gone through 3 alts had them all benchtested first all past fielded out the field wire with a test light to see if that would kick no luck .Any Ideas is it possible that the cpu is shot.

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  • Pontiac Master
  • 4,369 Answers

Not cpu.
Do not field out the field wire.
Is the alternator ight coming on?
If you rev engine, does charging system start working?
There is a resister wire that provides voltage to the field circuit. If the resister is bad, you will only get voltage to the field through the dash alt. light bulb when you push enough voltage through it.

I don''t have 1993, but here is 96:

Generator with Integral Rear Mount Regulator, Internal Fan Type With the key in the RUN position, voltage is applied through the charge indicator lamp I circuit to the voltage regulator. This turns the voltage regulator on, allowing current to flow from the battery sense A circuit to the generator field coil. When the engine (6007) is started, the generator (GEN) (10346) begins to generate alternating (AC) current which is converted to direct (DC) current by the rectifier internal to the generator. This current is then supplied to the vehicle's electrical system through the battery positive voltage (B+) terminal located on the rear of the generator. Once the generator begins generating current, a voltage signal is taken from the stator and fed back to the voltage regulator S circuit, turning off the charge indicator/lamp. With the system functioning normally, the generator output current is determined by the voltage at the A circuit. This voltage is compared to a set voltage internal to the voltage regulator, and the voltage regulator controls the generator field current to maintain proper generator output. The set voltage will vary with temperature and is typically higher in the winter than in the summer, allowing for better battery recharge. With the system functioning normally, the generator output current is determined by the voltage of the A circuit (battery sense voltage). The A circuit voltage is compared to a set voltage internal to the voltage regulator, which controls the generator field current to maintain proper output. The set voltage will vary with temperature and is typically higher in the winter than in the summer, allowing for better battery recharge in the winter and reducing the chance of overcharging the battery in the summer. A fuse link is included in the charging system wiring on all models. The fuse link is used to prevent damage to the wiring harness and generator if the wiring harness should become grounded, or if a booster battery with the wrong polarity is connected to the charging system.

93 Ford F250 5.8 L No Charge - 13ca225.gif

  • System Does Not Charge
  • Loose or worn drive belt.
  • Open/voltage drop in Circuit 38 (BK/O).
  • Open/voltage drop in Circuit 36 (Y/W).
  • Open/high resistance in Circuit 904 (LG/R).
  • Damaged regulator.
  • Damaged generator battery

Posted on Apr 13, 2009


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Posted on Jan 02, 2017

  • 958 Answers

SOURCE: Charging System Plymouth Barracuda

how did you know you do not have an output?

it is not charging?

the voltage of the battery is still below 13 volts?

have you rev it up a little bit?

some alternators , specially the big ones would like to work at a little bit high rpm specially if it's charging a big battery.

let me know what happen.

tnx 4 using fixya,


Posted on Oct 04, 2008

  • 40 Answers


regulator on alternator is bad

Posted on Jun 19, 2009

  • 1486 Answers


to the starter motor.

Posted on Aug 02, 2009

  • 1068 Answers

SOURCE: system charging for a bit then not and back and

sounds like the excited power my be falling off while in operation because that is all that controls it. if you have replaced the alt. and still have the issue you will be better of having that alt. turned into a self exciting alt. any rebuilder can but a self exciting feild in it. this is a very common practice. any alt. i have built this is how i get them done. then there no issues. good luck

Posted on Oct 21, 2009

  • 6826 Answers

SOURCE: 1973 ford f250 trailer special. new alt. wont

That would be my first guess,they are not very exspensive,if this still does not help,run a large wire on the back of the alternator with the old one still connected,to the positive battery post.This will increase the voltage to the battery also.Put it on the large batt,connector on the alternator,and run it to the battery post+

Posted on Feb 24, 2010

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