How do I replace the main wiring harness from the battery to the front of the car on an 08 Charger with a 2.7 V6

If you got a harness it shouldnt be a problem

secondary ground wire fried!!? this tells me that your main ground did lose its contact somewhere.usually opposite the battery side. when this happens, and you try to say, start the car, all that amperage will follow any available ground it can find, usually through the actual wiring harness that covers the entire car. see, most vehicles have 2 ground cable setups..a main, and a secondary.. the main consists of the large cables as well as "ground straps" which look flat and are made of braided wire and run from the car body to the block and areas like that. now if these fail or loose connection, the only other source for grounding will be the loop i the harness which is not big enough to handle the amperage needed to run the starter motor when activated by the ignition key. now since yours burnt up, it must be replaced and all ground wires checked..also check for shorts in the system elsewhere, with a meter if necesary, you can also disconnect the battery entirely and connect a 6 amp battery charger directly to the cables(like charging the car without the battery) and if there is a short, the guage on the charger will peg over without fear of fire you will hear a buzzing sound where the short is (usually)..I have used this trick to find shorted blower heater motors or wiper motors on big trucks..if this ground wire is wrapped into the actual harness setup, you will need to replace it by cutting loose the old one, run a new wire into any part of the system thats not damaged, usually near the headlight fixtures, then run it back to the original starting point ,then its process of elimination as to what will work and what wont, remember, all circuits will function some with the charger attached instead of the battery, you will hear a buzzing or humming especially when checking the radio..good luck

1. Disconnect and isolate negative battery cable.
2. Raise and support vehicle.
3. Note: If equipped with 4WD and certain transmissions, a support bracket is used between front axle and side of transmission. Remove 2 support bracket bolts at transmission. Pry support bracket slightly to gain access to lower starter mounting bolt.
4. Remove two mounting bolts (2).
5. Move starter motor towards front of vehicle far enough for nose of starter pinion housing to clear housing. Always support starter motor (1) during this process, do not let starter motor hang from wire harness.
6. Tilt nose downwards and lower starter motor far enough to access and remove nut that secures battery positive cable wire harness connector eyelet to solenoid battery terminal stud. Do not let starter motor hang from wire harness.
7. Remove battery positive cable wire harness connector eyelet from solenoid battery terminal stud.
8. Disconnect battery positive cable wire harness connector from solenoid terminal connector receptacle.
9. Remove starter motor.

What engine ? could have come with three different one's ? 3.5 ,3.9, 5.3 LGZ is a RPO code - look at RPO sticker on your vehicle . Could be driver door jam ,glove box , maybe trunk .
LS4
Engine - Gas, 8 Cyl, 5.3L, SFI, ALUM, Cylinder Deactivation, GM
LZE
Engine - Flexible Fuel, (Gas/Ethanol), 6 Cyl, 3.5L, SFI, V6, Offset Bore, GM
LZ4
Engine - Gas, 6 Cyl, 3.5L, SFI, V6, Offset Bore, GM

Do not see LGZ for 2006 impala
LA1
Engine Gas, 6 CYL, 3.4L, MFI, HO, GM
LZE
Engine Flexible Fuel, (Gas/Ethanol), 6 Cyl, 3.5L, SFI, V6, Offset Bore, GM
LS4
Engine Gas, 8 Cyl, 5.3L, SFI, ALUM, Cylinder Deactivation, GM
LZ4
Engine Gas, 6 Cyl, 3.5L, SFI, V6, Offset Bore, GM
LZ9
Engine Gas, 6 Cyl, 3.9L, SFI, V6, Offset Bore, GM
L36
Engine, Gas, 6 CyL, 3.8L, MFI, HO, ERV6 Series
L67
Engine Gas, 6 Cyl, 3.8L, MFI, V6, Supercharged

Regular Production Option (RPO) codes that are available on the vehicle. The vehicle's RPO list is printed on the Service Parts Identification Label.

When mixing parts from different model year vehicles in the electronic age one never knows what will happen . Try it an see what happens .

Hi, this is a 2 wire Delco alternator. The wire from the terminal on the back goes to the battery or starter, and the other (excite) wire goes to the battery light in the dash. It also goes to the PCM--not sure which pin, sorry.

if the battery is ok sounds like the main replay or fuse is blown

Removal and Installation L4-2.5L (QR25DE) Engines To Remove:

1. Before servicing the vehicle refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Engine cover
   • Front/right-side engine undercover
   • Drive belt
   • Alternator harness connector
   • Engine ground wire from top mount
   • Alternator upper and lower mounting bolts
3. Set the alternator aside and remove the top mount.
4. Remove the alternator.

To Install:

1. Slide alternator in place.
2. Install or connect the following:
   • Alternator top mount
   • Alternator upper and lower mounting bolts
   • Engine ground wire from top mount
   • Alternator harness connector
   • Drive belt
   • Front/right-side engine undercover
   • Engine cover
   • Negative battery cable

V6-3.5L (VQ35) To Remove:

1. Before servicing the vehicle refer to the precautions at the beginning of this section.
2. Disconnect the negative battery cable.
3. Drain coolant from the radiator into a suitable container.
4. Remove or disconnect the following:
   • Radiator
   • Front/right-side engine under cover
   • Drive belt
   • Idler pulley
   • Alternator adjustable top mount
   • Alternator lower mount bolt and nuts
   • Alternator lower front bracket bolt
   • Alternator harness connectors
   • Alternator

To Install:

1. Install or connect the following:
   • Alternator in place
   • Alternator harness connectors
   • Alternator lower front bracket bolt
   • Alternator lower mount bolt and nuts
   • Alternator adjustable top mount
   • Idler pulley
   • Drive belt
   • Front/right-side engine under cover
   • Radiator
2. Replace the engine coolant.
3. Connect the negative battery cable.
4. Start the engine and check for leaks.
5. Recheck coolant level and top off as needed.

For the 2000 Pontiac Grand Prix:
I do not know if you have the 3.1L V6 or the 3.8L (including Super Charger) V6; however I have included both below...

For the 3.1L V6:
Firing Order:
1-2-3-4-5-6
Cylinders:
......(back).......
'...1....3....5...'
____________
'...2....4....6...'
.......(front)
Ignition Coil Connections:
.'.5..2.'..'.3..6.'..'.4..1.'


For the 3.8L V6 including the Super Charger:
Firing Order:
1-6-5-4-3-2
Cylinders:
.....(back).......
'...2....4....6...'
____________
'...1....3....5...'
......(front)
Ignition Coil Connections:
(back)
o 6
o ---3
___
o 2
o ---5
___
o 4
o ---1
(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact us at FixYa.com!

check your engine and battery ground wires and the fuze links.