Headlights dim when brakelights on
Thread Starter
Racer
Joined: Mar 2006
Posts: 373
Likes: 0
From: Belews Creek N.C.
Headlights dim when brakelights on
I noticed the other night when I touch the brakes my headlights dim just a little bit. Any thoughts? I usually dont drive it much at night so I may have had this problem for a while.
Pro
Joined: Apr 2006
Posts: 552
Likes: 0
From: Alton Illinois
i would check the battery first. if the alternator is loaded with th battery there could be a dip in voltage as accessories are added. mine usually has 14.3 with engine on. possibly check across the poles on the battery and you should see more than 12 v. with engine off. weak ground or corrosion on brake light sockets could cause system to draw more than usual. maybe all you need will be a good inspection and cleaning of bat. terminals and brake sockets and grounds.
Last edited by bluvette79; Aug 5, 2007 at 09:35 AM.
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From: The 7th layer of hell - Western Washington
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,800
From: Charlotte, NC (formerly Endicott, NY)
It is common to all vehicles. On the Vette it may be worse than some other cars due to having 4 stoplight bulbs Vs 2. With the 4 bulbs in the back sucking additional current when you hit the brake pedal the voltage regulator takes a few 100 milliseconds to respond to the additional current draw and you see the lights blink.
Bill
Bill
Cruising
Joined: Jul 2007
Posts: 10
Likes: 0
cleaned my throttle body. since the car is a drive by wire. it has to open more than it should to get the idle to raise when the compressor kicks on or all the accys are running. there is for lack of a better term a hole in the map that the car sinks into. after the clean throttle and man there was some build up in there after 50k miles... all is well.
