5.7 not charging

[71bigblock]

Hey guys. I have a 5.7 in my '67 Dodge. I used a harness and computer from Squier Auto. My problem is that it is not charging. I have had the computer checked, it charges fine on a test truck. I've had the alternator checked, it charges fine. I've checked the wiring from the alternator plug- one is suppoosed go to ground, and the other to the computer. Continuity is fine from both wires. I even went as far to have my cousin come over with his Hemi Ram and used his alternator, still didnt work. No codes are being thrown for the alternator. Any ideas guys? And if anyone is still reading, please put this in the right place if it isnt. Thanks.

[OLJustice]

Contact Hemi31. Even though this is a non-conventional question, he may be able to steer you in the right direction.

[Hemi31]

bet you have the wire thats supposed to go to the starter going to ground.

[71bigblock]

The wire from the positive on the battery splits three ways. One I have to the starter, one to the alternator lug, and one to the firewall for under the dash everything. The starter relay wire from the harness is on the starter. Which wire do you mean? Everything (pretty much) works fine. Except it doesnt charge.


Thanks guys.

[Tbird100636]

What year truck is the PCM based off of??? All HEMI's are NGC, but depending on the year, the field control's wiring is different.

[71bigblock]

The engine is a 2004, and the computer I believe is the same. Manual transmission computer. I'm pretty sure that the alternator is a 2004 also, because when I got it from the salvage yard, they gave me the correct one. Thanks

[Tbird100636]

The engine is a 2004, and the computer I believe is the same. Manual transmission computer. I'm pretty sure that the alternator is a 2004 also, because when I got it from the salvage yard, they gave me the correct one. Thanks

1. Generator field control, K20 18 BR/GY
2. Ground Z20 18 BR/BK

POWERTRAIN CONTROL MODULE C2 (NGC) - ORANGE 38 WAY


As you can see, the field is always grounded, the control is power from the PCM. Pin 19 of PCM connector C2. Pin 1 of the alternator connector.

[71bigblock]

OK, so I think everything is correct, but what is the integrated power module? Something under the dash? I dont recognize it.

There are three grounds off of the battery? I have the main one on the block, the smaller one on the frame.

I just wish I could start it up and it would charge, ya know?

Thanks

[Fargo59]

the IPM is the underhood fuse block. it is called that as it integrates the power distribution centre with the front control module. in this case, the diagram uses it as a battery positive source (the positive lead is bolted to it. not necessarily needed in your case, just run the lead to the B+.

[Tbird100636]

the IPM is the underhood fuse block. it is called that as it integrates the power distribution centre with the front control module. in this case, the diagram uses it as a battery positive source (the positive lead is bolted to it. not necessarily needed in your case, just run the lead to the B+.

Just make sure your PCM Connector C1 pin 29 has a wire going to it with battery voltage all the time. Dumb question, but the harness you bought has the connector for the battery temp sensor, right???

[71bigblock]

Ah, I see. So if I have the key on and C1 plug out, the bottom right one should have 12v.

http://www.hotwireauto.com/?page=sales-dcx

That is the harness I got, 5.7 with standard transmission. No, I didnt see anything about a battery temp sensor. And no, its not a dumb question.

Thanks guys

[Tbird100636]

Ah, I see. So if I have the key on and C1 plug out, the bottom right one should have 12v.

http://www.hotwireauto.com/?page=sales-dcx

That is the harness I got, 5.7 with standard transmission. No, I didnt see anything about a battery temp sensor. And no, its not a dumb question.

Thanks guys

Thats's correct for the C1 connector. The picture on hot wire's site isn't very clear, so I can't tell which one is the Battery temp sensor connector if any. Battery temp sensor goes unde battery and depending on it's temp reading adjusts charging control.

[71bigblock]

Well, there is definitely 12v there, I just checked. There is definitely no battery temp sensor, either.

[Popeye's Hemi]

I thought the PCM used the ambient air temp to adjust the charging rate. The following is from my 05 LX Serive manual hope it helps.

CHARGING
DESCRIPTION - CHARGING SYSTEM
The charging system consists of:
² Generator
² Decoupler Pulley (If equipped)
² Electronic Voltage Regulator (EVR) circuitry within the Powertrain Control Module (PCM)
² Ignition switch (refer to the Ignition System section for information)
² Battery (refer to the Battery section for information)
² Ambient Air Temperature (If equipped)
² Inlet Air Temperature (calculated battery temperature)(If equipped)
² Voltmeter (refer to the Instrument Cluster section for information if equipped)
² Wiring harness and connections (refer to the Wiring section for information)
² Accessory drive belt (refer to the Cooling section for more information)
² Battery Temperature sensor (if equipped)
OPERATION - CHARGING SYSTEM
The charging system is turned on and off with the ignition switch. The system is on when the engine is running and
the ASD relay is energized. The ASD relay is energized when the PCM grounds the ASD control circuit. This voltage
is connected through the PCM or IPM (intelligent power module) (if equipped) and supplied to one of the generator
field terminals (Gen. Source +) at the back of the generator.
The generator is driven by the engine through a serpentine belt and pulley or decoupler pulley arrangement.
The amount of DC current produced by the generator is controlled by the EVR (field control) circuitry contained
within the PCM. This circuitry is connected in series with the second rotor field terminal and ground.
An Ambient air temperature sensor is mounted on the bumper used to calculate the temperature near the battery.
This temperature data, along with data from monitored line voltage (battery voltage sense circuit), is used by the
PCM to vary the battery charging rate. This is done by cycling the feed path to control the strength of the rotor
magnetic field. The PCM then compensates and regulates generator current output accordingly to maintain system
voltage at the targeted system voltage based on battery temperature.
All vehicles are equipped with On-Board Diagnostics (OBD). All OBD-sensed systems, including EVR (field control)
circuitry, are monitored by the PCM. Each monitored circuit is assigned a Diagnostic Trouble Code (DTC). The PCM
will store a DTC in electronic memory for certain failures it detects and illuminate the (MIL) lamp. Refer to On-Board
Diagnostics in the Electronic Control Modules(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/
POWERTRAIN CONTROL MODULE - DESCRIPTION) section for more DTC information.
LX CHARGING 8F - 39
The Charging system “Battery” light indicates problems with the charging system (voltage too high/low, generator
failure, etc.). If an extreme condition is indicated, the lamp will be illuminated. The signal to activate the lamp is sent
via the PCI bus circuits. The lamp is located on the instrument panel. Refer to the Instrument Cluster section for
additional information.
The PCM uses the inlet air temperature sensor or ambient temperature sensor to control the charge system voltage.
This temperature, along with data from monitored line voltage, is used by the PCM to vary the battery charging rate.
The system voltage is higher at cold temperatures and is gradually reduced as the calculated battery temperature
increases.
The ambient temperature sensor is used to control the battery voltage based upon ambient temperature (approximation
of battery temperature). The PCM maintains the optimal output of the generator by monitoring battery voltage
and controlling it to a range of 13.5 - 14.7 volts based on battery temperature.
DIAGNOSIS AND TESTING
ON-BOARD DIAGNOSTIC SYSTEM
The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging system, making sure
they are operational. A Diagnostic Trouble Code (DTC) is assigned to each input and output circuit monitored by the
OBD system. Some circuits are checked continuously and some are checked only under certain conditions.
If the OBD system senses that a monitored circuit is bad, it will put a DTC into electronic memory. The DTC will stay
in electronic memory as long as the circuit continues to be bad. The PCM is programmed to clear the memory after
40 good trip if the problem does not occur again.
DIAGNOSTIC TROUBLE CODES
A DTC description can be read using the DRBIIIT scan tool. Refer to the appropriate Powertrain Diagnostic Procedures
manual for information.
A DTC does not identify which component in a circuit is bad. Thus, a DTC should be treated as a symptom, not as
the cause for the problem. In some cases, because of the design of the diagnostic test procedure, a DTC can be
the reason for another DTC to be set. Therefore, it is important that the test procedures be followed in sequence,
to understand what caused a DTC to be set.
ERASING DIAGNOSTIC TROUBLE CODES
The DRBIIIT Scan Tool must be used to erase a DTC.
The following procedures may be used to diagnose the charging system if:
² the check gauges lamp or battery lamp is illuminated with the engine running
² the voltmeter (if equipped) does not register properly
² an undercharged or overcharged battery condition occurs.
Remember that an undercharged battery is often caused by:
² accessories being left on with the engine not running
² a faulty or improperly adjusted switch that allows a lamp to stay on. Refer to Ignition-Off Draw Test (Refer to
8 - ELECTRICAL/BATTERY SYSTEM/BATTERY - STANDARD PROCEDURE)
² loose generator belt.
INSPECTION
The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging system, making sure
they are operational. A Diagnostic Trouble Code (DTC) is assigned to each input and output circuit monitored by the
On-Board Diagnostic (OBD) system. Some charging system circuits are checked continuously, and some are
checked only under certain conditions.
Refer to Diagnostic Trouble Codes in; Powertrain Diagnostic manual for more DTC information. This will include a
complete list of DTC’s including DTC’s for the charging system.
To perform a complete test of the charging system, refer to the appropriate Powertrain Diagnostic Procedures service
manual and the DRBIIIT scan tool. Perform the following inspections before attaching the scan tool.
1. Inspect the battery condition. Refer to the Battery section (Refer to 8 - ELECTRICAL/BATTERY SYSTEM -
DIAGNOSIS AND TESTING) for procedures.
8F - 40 CHARGING LX
2. Inspect condition of battery cable terminals, battery posts, connections at engine block, starter solenoid and
relay. They should be clean and tight. Repair as required.
3. Inspect all fuses in both the fuseblock and Power Distribution Center (PDC) or IPM (if equipped) for tightness in
receptacles. They should be properly installed and tight. Repair or replace as required.
4. Inspect generator mounting bolts for tightness. Replace or tighten bolts if required. Refer to the Generator
Removal/Installation section of this group for torque specifications (Refer to 8 - ELECTRICAL/CHARGING -
SPECIFICATIONS).
5. Inspect generator drive belt condition and tension. Tighten or replace belt as required. Refer to Belt Tension
Specifications(Refer to 7 - COOLING/ACCESSORY DRIVE - SPECIFICATIONS).
6. Inspect decoupler pulley (if equipped). Ensure decoupler pulley is driving the alternator rotor.
7. Inspect automatic belt tensioner (if equipped). Refer to the Cooling System for more information.
8. Inspect generator electrical connections at generator field, battery output, and ground terminal (if equipped). Also
check generator ground wire connection at engine (if equipped). They should all be clean and tight.

[Tbird100636]

That's for an LX, because the battery is in the back. DR truck uses a battery temp sensor.