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Old 02-21-2011, 10:35 AM
Chris Elzie Chris Elzie is offline
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Default Headlight

My headlights on my 75 Superior ambulance only work on high beam and its not all four lights that come on just the inside 2, would that be a dimmer switch?
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Old 02-21-2011, 10:38 AM
Richard Vyse Richard Vyse is offline
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Originally Posted by Chris Elzie View Post
My headlights on my 75 Superior ambulance only work on high beam and its not all four lights that come on just the inside 2, would that be a dimmer switch?
Interesting situation. Do the low beams come on when you don't have the high beam ons? Where's Ed to get his thoughts.
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Old 02-21-2011, 10:59 AM
Todd Merrifield Todd Merrifield is offline
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Not sure when they started doing it, but on most of my four-headlight GM vehicles the low beams go out when the high beams come on. I can't remember what my 62 did, but I think it was the same way. Sounds like something is amiss in your low beam circuit.
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Old 02-21-2011, 11:25 AM
Richard Vyse Richard Vyse is offline
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Originally Posted by Todd Merrifield View Post
Not sure when they started doing it, but on most of my four-headlight GM vehicles the low beams go out when the high beams come on. I can't remember what my 62 did, but I think it was the same way. Sounds like something is amiss in your low beam circuit.
On my 73 before adding the red headlights, when activating the hi-beams all fours lights stayed on.
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Old 02-21-2011, 12:02 PM
Todd Merrifield Todd Merrifield is offline
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You may be right. Now that I think of it, I think I have a picture of my old 69 wagon with all four headlights on. I don't think I modified anything for it to do that. I know the 90's pickups only ever have two lights on at a time, high or low.
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Old 02-21-2011, 12:06 PM
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Bill Leverett Bill Leverett is offline
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Hi Chris...I had the same problem with my '73 Lifeliner. It was the floor dimmer switch. I pulled it off, cleaned all the contacts and made sure the wires were insulated well between each other and the floor after making the reconnections.

Electricity will do strange things when circuits are not "clean" and the ground is intermittent.

Good luck
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Old 02-21-2011, 12:36 PM
Raymond Armstrong Raymond Armstrong is offline
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Just checked the 75 thats been sitting a while. On high, only 3 lights came on, pumped it a few times and all 4 came on, so the dimmer switch was probably crusty.
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Old 02-21-2011, 01:45 PM
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Bill Leverett Bill Leverett is offline
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Default From my 1972 Shop Manual

Chris...here is a page from my 1973 Shop Manual. I'd really suggest that you try and find one for your car...saves alot of grief and at least sends you in a reasonable direction for trouble-shooting.
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File Type: pdf headlight issues0001.pdf (202.7 KB, 161 views)
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Old 02-21-2011, 04:05 PM
Paul Steinberg Paul Steinberg is offline
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With the introduction of the halogen headlamp bulb units, there was a short period of time that the cars started being wired so only 2 of the 4 bulbs were illuminated at any one given time.. The interesting thing is that they just didn't use the high beam headlight circuit on the outer bulbs, and they just had two terminals hooked up to the 3 terminals on the bulbs. It would be an easy fix if your car was wired this way, by just installing a jumper wire from the hot wire on the high beam bulb (inner) to the high beam terminal on the low / high beam bulb (outer).
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Old 02-21-2011, 05:27 PM
Chris Elzie Chris Elzie is offline
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what is happening is when I turn the lights on the inner two most dont come on unless they are on high, but when on high thats when the inner two some one but the outer 2 do not.
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