C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Dec 4, 2014 | 06:42 PM
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Default main beam

hi
my 78 corvette headlights flip up
but cannt get the main high beam to stay on or flash ?

nothing at all

any ideas

richard
england
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Old Dec 4, 2014 | 07:18 PM
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Originally Posted by 78 black vette
hi
my 78 corvette headlights flip up
but cannt get the main high beam to stay on or flash ?

nothing at all

any ideas

richard
england
Richard,
DO your headlights come on at all??? SO..... Do the low beams work (outer bulbs)?????

DUB
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Old Dec 4, 2014 | 07:23 PM
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hi
yes the lights come up and low been come on

thanks



Originally Posted by DUB
Richard,
DO your headlights come on at all??? SO..... Do the low beams work (outer bulbs)?????

DUB
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Old Dec 5, 2014 | 07:49 AM
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C3 lights do not flash. Have you checked to see whether the high beams are plugged up? (Stranger things have happened.)
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Old Dec 5, 2014 | 10:56 AM
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Check to see if you have power on the green wire going into the connector and going out.

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Old Dec 5, 2014 | 05:41 PM
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Originally Posted by 78 black vette
hi
yes the lights come up and low been come on

thanks
GOOD...Then..are you using the lever on the steering column to try to turn on the HIGH BEAMS???

IF you are...when you pull back on the lever...do you hear a 'click'????

The dimmer switch or high beam/low beam switch is mounted on the left side of the steering column. It should have a yellow, tan and light green wire going to it. The GREEN wire is your high beam wire. The TAN is the low beam.....and the YELLOW is the POWER from the headlight switch. SO...if you are not getting battery voltage to the LIGHT GREEN wire at this switch....and you if you MANUALLY press it TOWARDS the firewall to make it CLICK...and the LIGHT GREEN wire does not get battery power to us...then you more than likely have a BAD dimmer switch (high beam/low beam switch).

Hard to say any more due to you need to do testing with a VOLTMETER

DUB
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Old Dec 7, 2014 | 07:45 AM
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Default high beam

no click when you pull the lever on left hand side of column
no power at the green wire on the headlight fitting ,only one light on each side is lights up
rich
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Old Dec 7, 2014 | 05:21 PM
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Originally Posted by 78 black vette
no click when you pull the lever on left hand side of column
no power at the green wire on the headlight fitting ,only one light on each side is lights up
rich
GO BACK and read my LAST POST!!!!! POST #6.

DUB
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Old Dec 7, 2014 | 06:15 PM
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thanks for the help
i will try to find new switch
rich
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Old Dec 7, 2014 | 06:19 PM
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Originally Posted by 78 black vette
thanks for the help
i will try to find new switch
rich
Did you check it first????

DUB
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Old Dec 10, 2014 | 12:22 PM
  #11  
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Default corvette

i only get to work on corvette at the weekend so i will check it then

thanks for your help



Originally Posted by DUB
Did you check it first????

DUB
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Old Dec 10, 2014 | 06:58 PM
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Originally Posted by 78 black vette
i only get to work on corvette at the weekend so i will check it then

thanks for your help
I will wait and see what you find.

DUB
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Old Dec 10, 2014 | 10:34 PM
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It's quite the adventure to replace that switch. Took me a while just to find a replacement. I know at that time Eckler's didn't have it, might have gotten it at Zip.
Need to take a lot apart. Don't forget to make a bolt to lock the telescopic steering column down before pulling the pressure plate (special tool, Autozone)
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Old Dec 11, 2014 | 06:57 PM
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Originally Posted by Florida 79
It's quite the adventure to replace that switch. Took me a while just to find a replacement. I know at that time Eckler's didn't have it, might have gotten it at Zip.
Need to take a lot apart. Don't forget to make a bolt to lock the telescopic steering column down before pulling the pressure plate (special tool, Autozone)
He is not changing the lever...he is replacing the dimmer switch ...which is NOT inside the column....but rather outside the column on the driver side...accessible from under the dash area.

It is still FUN to service.

AND A TIP: Use an ALLEN set screw to lock down the telescoping shaft so your lock plate suppressor will work correctly.

DUB
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