Greetings, my name is Mark.
I found the bulletin that the chevy dealer most likely used when you mentioned they updated the "wiring". I was confused by that. I have included it below for your reading to confirm that they did do what this bulletin is "suggesting".
I too am only "suggesting" and telling you right up front, I do not have a concrete answer for you on your issue. Reading and re-reading your post, it really does sound like you have more than one concern, and I am wondering if they are related.
First of all, your lights shouldn't "flicker or dim". That is not a "user" preference or some made up problem. If your lights truly do "flicker or dim" and you can see that at night, then there is something going on. And my suggestion here is replace the Alternator. Even though you have had it checked out, even though your gauge is reading what it is, you still should at least start there. That is the factory of the electrical system and you have nothing to lose by replacing it. Your truck is 10 years old and you have a plow system hooked up. There is no doubt the alternator has been used extensively. Even if you feel this issue has been present for a long time, what have you got to loose?
AND, I wouldn't go aftermarket on the alternator. Step up to the window and get a genuine GM Alternator. This is something you can install yourself. Save the money on the labor. But use a genuine GM.
You second issue with the lights not being as bright and you're having trouble seeing, I cannot tell you the alternator is going to fix that. I am not sure this is a actual problem or a user preference. I have 3 vehicles of my own, and only one gives enough light to see safely. It is a user preference. The alternator may or may not be related.
Again, this is only a suggestion. I am only passing on what I would do if it were my vehicle. I hope the best for you and I hope you can get this resolved.
#PIT3170E: IPC, Interior Lights and/or Headlamps Flicker - keywords battery courtesy electrical fluctuation generator head intermittent lamp light - (Jan 11, 2006)
|Subject:||IPC, Interior Lights and/or Headlamps Flicker|
|Models:||1999-2005 All Cadillac Full Size Utilities |
| ||1999-2005 All Chevrolet Full Size Trucks and Utilities |
| ||1999-2004 Chevrolet Blazer, S-10 |
| ||1999-2005 All GMC Full Size Trucks and Utilities |
| ||1999-2004 GMC Envoy Classic, Jimmy, Sonoma |
| ||1999-2001 Oldsmobile Bravada |
| ||Without Regulated Voltage Control|
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Customers may have comments of a flickering light condition in the IPC, interior lamps or headlights. This condition is most likely to be noticed when the engine RPM is low and when high electrical load requirements are in place on the generator.
Recommendation / Instructions:
Important: Review bulletin 02-06-03-008A - Low Voltage Display on IP Gauge, Lights Dim at Stop Lights, Battery Discharged, before proceeding with this PI.
- Disconnect the negative battery cable from the battery/batteries.
- Slide the protective boot on the generator BAT terminal aside and remove the retainer and wire cable from the BAT terminal.
- Unplug the generator 4-cavity terminal from the top of the generator.
- Inspect cavity D on the generator connector for a red cavity plug. If a red cavity plug is present, it is not necessary to replace the generator connector. Remove the CPA and save. Remove the red cavity plug and continue with step 9. If a red cavity plug is NOT present, continue with the next step.
- Remove and save the orange Weatherpack seal and CPA from the 4-way connector.
- Using the proper terminal removal tool, remove the two or three wires from the 4-way connector. On vehicles without Supplemental Brake Assist (SBA), install a red cavity plug, P/N 12059168, into cavity "A" of the new 4-way connector, P/N 12186568. On some 2003 and 2004 model year vehicles with SBA, install the dark blue (Circuit 5668) wire of the vehicle wiring harness into cavity "A" of the new 4-way connector.
- Depending on the vehicles model and year, install the brown wire (Circuit 25) or red wire (Circuit 225) of the vehicles wiring harness into cavity "B" of the new 4-way connector.
- Install the gray (Circuit 23) wire of the vehicle wiring harness into cavity "C" of the new 4-way connector.
- Obtain a piece of 0.80 mm/18GA black wire, 254 mm (8 in) long.
- Install a red terminal seal, P/N 12048086, and terminal, P/N 12048074, (crimp and solder) on one end of the new black wire.
- Install the new black wire into cavity "D" of the new 4-way connector.
- Reinstall the connector seal and CPA, from the original connector, to the new connector.
- Plug the 4-way connector into the generator.
- Route the black wire to the generator BAT terminal, sliding the wire into the small end to the output terminal boot, along side the generator output wire.
- Obtain a ring terminal from the terminal kit (J-38125-D) that is the same diameter as the positive post of the generator. Crimp and solder the ring terminal from the terminal kit (J-38125-D) on to the open end of the new black wire.
- Place the generator output wire and the new black wire onto the generator BAT terminal and install the retainer.
- Connect the negative battery cable.