Question about 1997 Pontiac Grand Prix

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I have a 97 gtp I'm having a charging problem I've replaced the pcm, battery and the altantor. I have also tracked down the wire but the battery light comes on. The pcm reads 1.22, battery and alt read 11.76 but when the car is off the battery goes to 12.67. I need help bad!!!!!!

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Hello! It sounds like you may have a fusible link issue. If you follow the wire from the alternator down to the starter (which would be the larger of the wires attached to it); near the end you will find the fusible link. If this is blown - your alternator will not charge the battery.

Hope this helps and good luck! Thanks for using FixYa!

Posted on Sep 28, 2009

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Posted on Jan 02, 2017

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What do you mean won't stay charged ? Battery dies while driving , dies over night ? Is the battery symbol lit on the dash , check charging system message on driver info center ? If it drains over night there is a parasitic draw on the electrical system ! If while driving the battery goes dead it's not charging , with a new alternator the problem is in the electrical circuitry . Blown fusible link or fuse . This charging system is controlled by the PCM - engine computer , the heavier gage wire on the back of the alternator should have battery voltage , if not blown fusible link near the battery . The connector with three wires ,one should have B+ voltage , the other two come from the PCM .

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PCM fuse keeps blowing


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I did look at power distribution wiring diagram for your vehicle, I found pcmB fuse--20 amp. Two fuse legs goes to pcm, the other goes to load side of fuel pump relay. If I had to guess, I'd say the fuel pump has a problem. If the wiring before the fuel pump relay or the pcm was the problem, then the fuse would blow as soon as soon as you plug it in. The fuse circuit shows to be hot all the time. Just my opinion. There might be other issues, but, I can't track it from where I am.

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I own a 97 dodge dakota sport v8 magnum with a 318 its having problems holding a charge , i've replaced the alternator the belt and the battery , still won't hold a charge to the alternator


1997 DODGE DAKOTA CHARGING SYSTEM
OPERATION:
The amount of amperage produced by the alternator is controlled by the Electronic Voltage Regulator (EVR) circuitry within the Powertrain Control Module (PCM)
EVR circuitry is connected in series with the alternator field driver terminal and ground. A Battery Temperature Sensor (BTS), located in the battey tray under the battery, is used to sense battery temperature.
Sensed battery temperature and data from monitored line voltage is used by the PCM to adjust the battery charging rate. This is accomplished by cycling the ground path to control the strenght of the alternator magnetic field.
The PCM then compensates and regulates alternator amperage output accordingly.
If a problem is sensed in a monitored circuit, a Diagnostic Trouble Code (DTC) will be stored in PCM memory and the Malfunction Indicator Light (MIL) (commonly refered to as the "check engine light") will be illuminated, providing certain criteria have been met.
DTCs can be read using Chrysler's Diagnostic Readout Box (DRB-III) or a generic scan tool.
When diagnosing any problem concerning the charging system on this vehicle, it is recommended that you begin by scanning the PCM for fault codes in order to eliminate certain possibilities and provide a more accurate and timely diagnosis.
If you have any fault codes pertaining to your charging system, please post them in a reply on this page and I will be happy to guide you through the diagnosis process.

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bad fuel pump.- just replace it and your good to go!

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