Pete Phillips Posted March 20, 2022 Share Posted March 20, 2022 My 1964 LeSabre's headlights and all of the other lights go from dim to bright, dim to bright, every second or less when I have the headlights on. It seems to occur only at speeds above idle, and affects all of the lights. It's not a circuit breaker cutting in and out--I know what that is like. Car runs and drives just fine, odometer shows 77,000 miles but could be 177,000. Any idea what is wrong? The car has been repainted a few years ago. Someone said it might be a bad ground? Pete Phillips, BCA #7338 Leonard, TX. Link to comment Share on other sites More sharing options...
meteor Posted March 20, 2022 Share Posted March 20, 2022 I had this issue on my 87 Cadillac. The alternator was was over charging the battery putting out too much volts. Roger Link to comment Share on other sites More sharing options...
JohnD1956 Posted March 20, 2022 Share Posted March 20, 2022 2x for both ideas, the voltage regulator and poor ground. It may be as simple as a poor ground at the voltage regulator. 2 Link to comment Share on other sites More sharing options...
kegart Posted March 20, 2022 Share Posted March 20, 2022 I had the same problem when I replaced my voltage regulator with a new one. I found a good used one and problem went away. Kevin Link to comment Share on other sites More sharing options...
SBRMD Posted March 21, 2022 Share Posted March 21, 2022 Ditto. Had same with my '68 GTO, new voltage regulator fixed it. Link to comment Share on other sites More sharing options...
60FlatTop Posted March 21, 2022 Share Posted March 21, 2022 Check the dimmer switch and its wiring before you get too deep into it. Link to comment Share on other sites More sharing options...
Wayne R Posted March 23, 2022 Share Posted March 23, 2022 (edited) Pete, as others above have said, but also i went to show you a photo of small battery monitor, but for some reason my photo connection is not working--will try get my daughter to repair tomorrow, . Back to tell you ,the monitor is only about $12.00 small about 3 inches they go straight into your cigarette lighter socket, and before starting your car ignition on will show your batterys power should be about 12.6 volts, but when you drive off should show about 13.5 to 14.5 as your driving,---these are great-- and will show what your car is doing. Reason i have had one for years is with old Porsche 911 up to about 1987, they did not have alternator reading dials,---so these Monitors are a must,--reason with Porsche batterys are in the front under hood, and if a alternator regulator goes faulty , swells the battery and blows up causing a very bad fire , can push the volts up to about 16 to 18 volts, . a new regulator is then required. very expensive for Porsche 911. my present monitor is a Digiteck n287, one i had a few years back i purchased one from amazon, Edited March 26, 2022 by Wayne R (see edit history) 1 Link to comment Share on other sites More sharing options...
Smartin Posted March 23, 2022 Share Posted March 23, 2022 Voltage regulator, has happened to me twice on two different cars. Link to comment Share on other sites More sharing options...
60FlatTop Posted March 23, 2022 Share Posted March 23, 2022 2 hours ago, Wayne R said: Pete, as others above have said, but also i went to show you a photo of small battery monitor, but for some reason my photo connection is not working--will try get my daughter to repair tomorrow, . Great looking tool. I just bought one on Ebay: https://www.ebay.com/itm/194163501585?chn=ps&var=494259348262&_trkparms=ispr%3D1&amdata=enc%3A1U_dzGtOvT_eX0rWdEnaTJw20&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=494259348262_194163501585&targetid=1599090334937&device=c&mktype=&googleloc=9005570&poi=&campaignid=15275224983&mkgroupid=131097072938&rlsatarget=pla-1599090334937&abcId=9300697&merchantid=263811981&gclid=CjwKCAjwiuuRBhBvEiwAFXKaNBCGeXSEnI0ovag7G-fYe1gLmbvmpWyixByrnV-B1VrpErVMUUUu8RoC7XYQAvD_BwE 1 1 Link to comment Share on other sites More sharing options...
NTX5467 Posted March 24, 2022 Share Posted March 24, 2022 Neat product! USB charger, too! Link to comment Share on other sites More sharing options...
60FlatTop Posted March 24, 2022 Share Posted March 24, 2022 On 3/20/2022 at 8:49 AM, Pete Phillips said: Someone said it might be a bad ground? Is that the car you imported from western New York? Link to comment Share on other sites More sharing options...
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