1969 Pulsating Headlights - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 27th, 00, 02:40 PM Thread Starter
Join Date: Oct 1999
Location: GC,NY,US
Posts: 8

Recently noticed when running at night that the brightness of my headlights and dash lights vary with engine speed. Recently changed the battery, alternator and voltage regulator. The belt is also properly tensioned. Would appreciate any thoughts.
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post #2 of 5 (permalink) Old Jan 27th, 00, 04:42 PM
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Join Date: Dec 1999
Location: Hayward,Ca,USA
Posts: 287

I friend of mine had a similar problem a year or so ago, I think he eventually traced it to a bad ground. Good luck. Wiring problems suck.

Steve R.
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post #3 of 5 (permalink) Old Jan 28th, 00, 04:34 AM
Join Date: Oct 1999
Posts: 217

Yes, wiring problems do suck. Imagine chasing down wiring problems in a 99 instead of a 69. Comapratively speaking, the old car is childs play. Like Steve said, make sure you check all grounds, it does not necessarily hve to be in the head light system. Ground loops can cause all sorts of strange behavior, including that infamous alternator whine through your stereo. All due to poor grounding. I would start checking around the dash, there are a few ground wires behind the cluster panel, and I believe there is a decent sized ground running right from the light switch itself, make sure it is properly grounded. Continue this process for every ground wire you find. The switch itself is also a possible culprit. If you have really crusty old lighting wires, you may want to think about replacing them. I know light harnesses aren't cheap, but old corroded ones could be partially to blame, as they get old and oxidized, the resistance goes up, lights get dimmer....etc.

Good Luck,

Shawn Peterson
1969 Z28, 406SB
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post #4 of 5 (permalink) Old Jan 28th, 00, 04:38 AM
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Join Date: Jul 1999
Location: Broomfield, Colorado
Posts: 755

Check out the little positive battery lead junction block thingie on the radiator support by the battery. That connection needs to be clean and tight. Also, Shawn is correct on checking all the ground wires. Other than that it could be aliens.

'69 400SB, Richmond 5-speed
'99 HD Road King Classic
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post #5 of 5 (permalink) Old Jan 28th, 00, 07:58 AM
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Join Date: Nov 1999
Location: squaw Valley
Posts: 34

I traced my pulsating lights to a improperly adjusted voltage regulator, even though it was new. It seems like those parts rebuilders don't remember how to work on something as ancient as points! Check the voltage at your battery and see if it varies with RPM, that might tell you if your problem is in a bad ground or not. If you get a variance at your battery you could have an out of adjustment voltage regulator and not a bad ground.
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