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Old 06-14-2011, 12:05 PM
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low beams wont turn on , but if i turn high beams on

ok so my 1966 caprice headlights would not turn on so i hit the foot switch for the high beams and both sets o light turned on, so bulbs are good. does anyone know what might be going on!!!thanks

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Old 06-14-2011, 01:07 PM
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the easiest thing to do is get a multimeter and chase the problem.
first check at the bulb and work your way back.
only 1 wire to chase...

if you have quad headlights, i suspect a ground problem
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Old 06-14-2011, 02:36 PM
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Quote:
Originally Posted by logic-ali
ok so my 1966 caprice headlights would not turn on so i hit the foot switch for the high beams and both sets o light turned on, so bulbs are good. does anyone know what might be going on!!!thanks
First of all, the fact that the low beams are on with the high beams does NOT mean the bulbs are good. The low beams have two separate filaments, one that lights on low beam and one that lights on high beam. That's why the low beams have three terminals but the high beams have only two.

It's entirely possible that both low beam filaments have burned out. If the bulbs really are good, then the dimmer switch is the most likely problem.
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Old 06-14-2011, 04:21 PM
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Quote:
Originally Posted by logic-ali
ok so my 1966 caprice headlights would not turn on so i hit the foot switch for the high beams and both sets o light turned on, so bulbs are good. does anyone know what might be going on!!!thanks

Needs a new (DIMMER SWITCH) should fix it.



Cole
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Old 06-14-2011, 04:29 PM
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Yes, both lows can burn out at the same time as it recently happened to me with a pair of halogens, but seldom with the old sealed beam bulbs. The plug on the switch just may be loose/partially disconnected or that $10 buck switch went dead.
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Old 06-15-2011, 05:24 PM
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Quote:
Originally Posted by logic-ali
ok so my 1966 caprice headlights would not turn on so i hit the foot switch for the high beams and both sets o light turned on, so bulbs are good. does anyone know what might be going on!!!thanks
Probably the foot switch, since both are on when you select the high beams, it tells you the wiring between the head lights and the switch is functional as they should both be on when high beams are switched to on. So there's power into the switch and power out on the high beam side what's in the middle is the switch so my best guess would be part of the switch has gone dysfunctional.

Bogie
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Old 06-15-2011, 06:44 PM
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pin connector

I had the same problem with my 57 gmc. Changed dimmer switch, that didn't help. Traced wires and come upon a pin connector that was loose. Fixed that, feed the cows and called it a good day. Don't know if this will help in your application. Just another possibility.
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Old 06-15-2011, 08:38 PM
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Yep Dimmer Switch. I also have had the same problem.
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Old 06-16-2011, 08:21 AM
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Quote:
Originally Posted by oldbogie
Probably the foot switch, since both are on when you select the high beams, it tells you the wiring between the head lights and the switch is functional as they should both be on when high beams are switched to on. So there's power into the switch and power out on the high beam side what's in the middle is the switch so my best guess would be part of the switch has gone dysfunctional.

Bogie
Sorry, but this is not true for GMs. The low beam bulbs have two filaments and two separate wires from the dimmer switch. The fact that the high beam filaments light does not prove that the wiring to the low beam filaments is functional. As I noted previously, the problem COULD be the dimmer switch, it COULD be the wiring, or it COULD be the low beam filaments are burned out. It's easiest to check for voltage at the low beam terminals of the headlight sockets, since that costs nothing, before buying any replacement parts.
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Old 06-16-2011, 08:31 AM
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Quote:
Originally Posted by joe_padavano
It's easiest to check for voltage at the low beam terminals of the headlight sockets, since that costs nothing, before buying any replacement parts.
Come on Joe, it is far easier to start changing parts than to diagnose the problem, fix the problem right, and save money.
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Old 06-16-2011, 10:21 AM
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Come on Joe, it is far easier to start changing parts than to diagnose the problem, fix the problem right, and save money.
Hee Hee, nothin like a little healthy sarcasm .
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Old 06-23-2011, 03:51 PM
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I had the same issue with my 72 C20. All I did was pull the plugs from the back of the lights, clean the posts and snap them back on and low and behold it fixed the problem.

In my experience the simplest solution is normally the correct one.
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