Lights dim on 06 Tahoe

[ScottL4619]

I don't know, my 01 did the same thing. Are there people out there who's lights do not dim when you do this??

 

[g0nefishin]

ScottL...if you read my first and or second post from this thread my 01 Hoe did the same thing however there was a fix for that with the programing and idle adjustment....the 06 is drive by wire...two totally different systems....i hope there is someone out there with the same problems we are experiencing and have a solution

 

[ScottL4619]

I don't know if I was exception, but I am 100% certain that my 01 had a drive by wire. I cleaned the throttle body many times and the dealer even replaced the gizmo that opened and closed the throttle (that was their fix for a stumbling idle).

 

[MeanGreen03]

Mine does the exact same thing. I'm assuming it is normal...

 

[KMV77]

I have an 05 Tahoe, 160amp alt with no electrical add ons. Mine does the exact same thing too. I guess its normal but i don't think it should be. I really notice it when the windows are up and I hit the switch to make sure they're up. My old CJ had this problem. To eliminate it I relayed the headlights straight to the battery so instead of drawing power through the electrical system where everything else draws power too it draws power for the headlights straight from the battery, and they don't dim anymore. The old power source for the headlights is used to turn the relays on, then they draw from the battery. Its quite simple but I wouldn't bother going through all that trouble with my Tahoe though...
Kevin

 

[smurphy80]

When your windows are up and you are hitting the button to bring them up...you are indeed sending more current to the window motor. The motor is trying to push the window thru the frame in essence. There is no stop on our trucks that i am aware of that cuts power to the window motor when the windows are up, except for the fuse that is going to trip if you hold it too long or the window motor overheating. So in doing this you are creating a huge load from the window motor, hence the dimming of the lights and the voltage dropping. I have had this in every vehicle I've owned, simple solution was to deal with it or dont try putting the windows up when they are already up. If im remembering right, all the electrical systems are fed from the battery, the alternator is just charging. This current drop results from the battery, not the alternator. If it really bothers you that much, I would check your battery or replace with a higher a$$ amperage battery. This is just like the guys who have huge stereo systems in their truck and get lights dimming when the bass hits. Its perfectly normal, something has to give and it results in a current drop. I definitely don't think GM ever planned on someone trying to close windows when they are closed. Hope this helps some, I do electrical engineering, and this is fairly common.

 

[g0nefishin]

smurphy...thank you for your input. I own an autoparts store NAPA, and deal with a lot of shops and chevy dealers so I come in contact with a lot of people to ask. Just figured I would send something out on this forum and see what sticks. Thank you for everyone input!

 

[Physh1]

I never had that problem BUT when I did the 'big 3" upgrade everything seemed to work better. Especially the windows when the headlights were on.

Cameron

 

[smurphy80]

no problem, although after re-reading my post...I hope i didnt come across harshly...was def not intended that way.