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Instrument Lights



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macquigley

Club Member

Tue 08 Aug 17 23:45

Instrument Lights


Can anyone tell me if there is any common fault with a 77 C3 that could cause all the instrument illumination lights to fail?

I drove my C3 last Friday after dark for the first time and its hard to tell what speed your doing when none of the instrument lights work! Had to use the force to stop getting a speeding ticket.

Checked all the fuses tonight and replaced one that was blown but that didnt help (and as a second question, anyone got a diagram that shows what fuse is for what circuit?).

This is my first Corvette and im still on a steep learning curve.

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roscobbc

Committee Member

Wed 09 Aug 17 00:32

Re: Instrument Lights


Try the head/side light switch. Has a reostat to dim instrument lights - can get a 'dirty' winding track causing panel lights to flicker.........


--------------------
CCCUK Chairman
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
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macquigley

Club Member

Wed 09 Aug 17 07:57

Re: Instrument Lights


Thanks Ross, I didn't realise the instrument lights dimmed. I'll check that out tonight.

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roscobbc

Committee Member

Wed 09 Aug 17 09:24

Re: Instrument Lights


macquigley wrote (View Post):Thanks Ross, I didn't realise the instrument lights dimmed. I'll check that out tonight.

I have a similar issue with my early C3 (and I'm presuming yours will have a 'dimming' headlight knob)
The reostat or potentiometer is a wire wound device and any American car that has this facility will always seem to have the issue of a 'dirty track' where the electrical connections just don't make proper contact - the usual result with be the panel lights flashing as you rotate the knob - rotate fully and the interior lights should illuminate.


--------------------
CCCUK Chairman
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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kentvette

Club Member

Wed 09 Aug 17 09:53

Re: Instrument Lights


This any good?

If you google "C3 Fuse Panel" you'll get a few images of the fuse box.

If you don't have one, I'd strongly recommend you buy a copy of the "Drivers Handbook" for a '77. Probably available from the usual US suppliers, or on ebay etc. Glovebox size, but invaluable for finding how your car works, but also contains all sorts of other useful info.



Last edited by kentvette on Wed 09 Aug 17 09:56; edited 1 time in total. [62 %]
--------------------
Stephen J Irons
CCCUK Lifetime Member
Corvette Club France
Corvettes of Southern California
NCM Family Member
Stephen & June's Web Site
Red Corvettes Have More Fun!

Apple IS Genisys!
The "Born-Again Greenies" are killing the planet! It's time to wake up and smell the rain-forest burning!

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Redlevel

Club Member

Wed 09 Aug 17 10:07

Re: Instrument Lights


Wind the knob back and forth a few times to clear the track. That should help. Its just like an old music centre volume control knob that crackles when you turn it.

We had the same issue with Siemens ITU ventilators whereby all the knobs (20) on each vent had to be wound back and forth fsd regularly to prevent spurious alarms. Soon got rid of them!

I have a switched strip of green led's behind my head ala Street Outlaws which enables the dash auto dimmer to brighten the display well in poor light or night time without causing reflection issues or hurting my night sight.

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macquigley

Club Member

Wed 09 Aug 17 11:54


Cheers guy's, I appreciate the advice.

I'll have a look for that drivers handbook Stephen. I do have a Haynes but as usual its good in some places and terrible in others.

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kentvette

Club Member

Wed 09 Aug 17 15:41


macquigley wrote (View Post):Cheers guy's, I appreciate the advice.

I'll have a look for that drivers handbook Stephen. I do have a Haynes but as usual its good in some places and terrible in others.



This one looks like a good deal to me.....Thumbs up

http://www.ebay.com/itm/1977-CORVETTE-CHEVROLET-CAR-OWNER-OP...


--------------------
Stephen J Irons
CCCUK Lifetime Member
Corvette Club France
Corvettes of Southern California
NCM Family Member
Stephen & June's Web Site
Red Corvettes Have More Fun!

Apple IS Genisys!
The "Born-Again Greenies" are killing the planet! It's time to wake up and smell the rain-forest burning!

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macquigley

Club Member

Wed 09 Aug 17 23:12


Instrument lights all working now. You were all spot on it was just the dimmer that was turned down. At least driving in the dark wont be such an issue!

I'll order myself up a copy of that, thanks Stephen.

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macquigley

Club Member

Wed 09 Aug 17 23:16


Owners manual ordered.

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