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Old 04-24-2008, 11:00 AM
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No High Beams -74 Vega GT

Greetings from Alberta,Canada.

I can't get this one figured out on my 74 Vega GT,all my lights work except the high beams.The headlights are new,the dimmer switch is new,the headlight switch is new.

I have cleaned the contacts on the headlight sockets,sanded the grounds down to bare metal on the core support and checked all the wiring and can find nothing wrong

The only other thing I can think of is to unravel the headlight wiring harness and look for a fault in the wire(s) but I would rather not do this until the last resort.

Am I missing something obvious here? Suggestions?

Vega wiring diagram

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Old 04-24-2008, 11:06 AM
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This exact situation happened to me too. I found the wires for the brights had been rubbing together inside the harnes and wore thru the insulation making contact with eachother. It was not a short, just on all the time. Replaced the wires and everything works fine. Took me almost a year to figure it out. Good luck!
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Old 04-24-2008, 11:34 AM
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Recheck the dimmer switch.

power from the headlight switch goes to the center terminal.
with the headlights 'ON'---you should get 12vdc to only one of the other terminals.

Click the dimmer, and the 12vdc should move to the other outboard terminal.
Could be the 12vdc is going to the wrong position on the dimmer.

Should be green and tan to the outboard terminals----
Yellow, or Blue to the center---(some other color other than green or tan)
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Old 04-24-2008, 12:02 PM
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Hey thanks for the reply's guys and I found the problem.

Seems somebody was into the harness before but it didn't look like the "tape" was disturbed.

Unravelled it all and found no less than 7 butt connectors 1 was disconnected and that was the culprit.Replaced them all and all's cool.

Now would be a good time to add some relay's while I've got the wires exposed,I think I can mount the relay's near the bus terminal and tap into the low/high beam wires.

Does it matter if the relay's are far away or should they be next to the headlights if possible?

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Old 04-24-2008, 02:16 PM
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Headlight relay position

The relays should be as close to the source of power, and the load as is possible. Using thicker wire in the circuit is also good. Do not forget the ground side of the headlight circuit. Try to limit the number of splices, and I believe soldering the connections is also a good idea. Try not to wick a lot of solder up into the wires. it makes the wires brittle, and they could break a few ywers down the road.
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