[turbotodd69]

I took mine to the dealer and they said it was normal. They also said they have had a lot of complaints about it. They also told me flying monkeys are going to come out of my tailpipes and I should follow the yellow brick road lmao. Ajm let me know if you get anywhere with dealer I'm about out of warranty.

 

[juma]

My guess is the cold lowered the battery powere and the normal resistence in the wires was limiting voltage. what may help is cleaning your grounding wires and adding a ground wire. audiophiles often double the size of all the main positive and negative wires to overcome the resistence in small wiring to make sound better. this improvement also improves the ECU operation and all other electrical components. the impala has a big main power wire but the hot wire to the fuse box is only a 4 gauge and the grounds to the body and the same. I have installed a additional ground from the heads to the negative ground. I'm also going to add a 8 or 4 gauge positive wire to the fuse box when I get more time. I get no flickering and the motor really purrs with that extra ground wire.
Upgrading a car's electrical system: do you need the big 3?

 

[jtrosky]

For the record, I have a 2012 LT and I have never experienced this issue (stock battery, stock headlights, no foglights) - 30k miles.

 

[LazerBlue07SS]

It could be the bulbs that you are using. Why not go HID and get tons more light and no problems with cold flickering?

Nah, not true on either count... My '07 does this too, regardless of temps and what bulbs I use. I had HID's in it, and has a massive flickering issue. No matter what I did - relay harness, error code cancellers, new bulbs and ballasts, I still had a bad flickering issue. The car could be sitting still, parked and engine not running and they would still jump like crazy.

Now that I have regular halogen bulbs (Silverstars for headlights...), I still get an occasional flicker. Not anywhere near as bad with the HID's, but I will get one occasionally. And when it happens, ALL of my lights flicker - dash, headlights, fog lights, ect... I have had the battery and charging system checked twice so far and both times it tested okay. I get no voltage drops at all (monitored by Diablo Trinity...), so nothing out of the ordinary when driving and operating...

Can't explain either issue. The HID's were when everything was stock, and the current flickering started when I had the stock radio in it also. Weird, yes.

 

[juma]

Nah, not true on either count... My '07 does this too, regardless of temps and what bulbs I use. I had HID's in it, and has a massive flickering issue. No matter what I did - relay harness, error code cancellers, new bulbs and ballasts, I still had a bad flickering issue. The car could be sitting still, parked and engine not running and they would still jump like crazy.

Now that I have regular halogen bulbs (Silverstars for headlights...), I still get an occasional flicker. Not anywhere near as bad with the HID's, but I will get one occasionally. And when it happens, ALL of my lights flicker - dash, headlights, fog lights, ect... I have had the battery and charging system checked twice so far and both times it tested okay. I get no voltage drops at all (monitored by Diablo Trinity...), so nothing out of the ordinary when driving and operating...

Can't explain either issue. The HID's were when everything was stock, and the current flickering started when I had the stock radio in it also. Weird, yes.

check your voltage at the headlight bulb - that will give you the voltage that your bulb is really seeing out at the end of the circuit of small wires. since you see the flicker even with another headlight harness, I suggest cleaning all grounds and the alternator positive connection.

 

[ajm786]

I have installed a additional ground from the heads to the negative ground. I'm also going to add a 8 or 4 gauge positive wire to the fuse box when I get more time. I get no flickering and the motor really purrs with that extra ground wire.

How do I do this? Can you recommend me to a good write up step by step?

 

[juma]

Here is the upgrade for a similar car. Use 4 gauge cable though and just in effect double up the original red main power cable from the alternator to the battery. then, its just two black cables to ground battery directly to the body and the engine.

http://www.impalaforums.com/chevy-impala-8th-gen-discussion/242874-big-3-upgrade.html

first move though is to trace the ground cable from the battery to wherever it is bolted to the frame and then clean that connection - take it loose and wire brush all the contact surface, lubricate with dielectic grease and reassemble.

I measured the 4 gauge cables lengths I would need and found a ebay source that made them in red and black for ground. then installed. You may be able to find the right lengths and cable end combinations at advanced auto or autozone. You can probably find a big 4 gauge ground cable to use between the battery and engine- this would be the first to do after cleaning your main ground.