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79 gauge circuit board help needed

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Old Nov 14, 2010 | 04:19 PM
  #1  
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Default 79 gauge circuit board help needed

My gauges werent working so I pulled the gauge cluster out and found the wiring harness plug was only half plugged in. I can see some of the tabs on the cb were broken off. Im going to order a new cb. My question is about the open holes on the back. Should there be a light socket in each of the 3 open areas? Does it matter what color socket goes in each hole? I also see just to the right of where the plug goes in, theres a nut missing. Will I need to get a new one when I install the new cb? I just wanted to figure out what all I will need to order besides the cb. TIA......Dave

Last edited by C3Dave; Nov 14, 2010 at 04:23 PM. Reason: pic not working
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Old Nov 14, 2010 | 04:48 PM
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you have all the nuts in the right place. Looks like you just need to replace the printed circuit.

The housing show below has the low fuel warning module in it, and you have a bulb.. (upper left hand corner)... you should remove this bulb socket and place it in the one below where you are missing one. If you leave it where you have it the light will stay on all the time. In the two on the right hand side in the picture.. yes.. these need to be bulbs and not open holes.

Here is a link the printed circuit on the forum special section of the site too!

http://willcoxcorvette.com/advanced_...php?cPath=2059


Last edited by Willcox Corvette; Nov 14, 2010 at 04:55 PM.
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Old Nov 14, 2010 | 04:51 PM
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Here is another picture of the printed circuit... it has all the circuits mapped out for testing.


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Old Nov 14, 2010 | 06:11 PM
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Thank you for the info and diagrams Willcox. I will order the circuit board from you tonight. Do you stock the 2 bulb sockets that I need?
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Old Nov 15, 2010 | 10:21 AM
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Originally Posted by C3Dave
Thank you for the info and diagrams Willcox. I will order the circuit board from you tonight. Do you stock the 2 bulb sockets that I need?
http://willcoxcorvette.com/product_i...ducts_id=25914

We have them.. they are 5.90 each.. if you need them added, call sales at 800-588-3883 and/or send Tommy an email at willcox@willcoxcorvette.com.

post here too.. I'll be checking in off and on.

Willcox
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Old Nov 15, 2010 | 10:45 AM
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I called customer service and spoke with Norm who added the sockets to my order. Thanks again for your help.
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Old Nov 15, 2010 | 04:12 PM
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No Problem and thank you for the order!

Willcox
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Old Nov 15, 2010 | 10:09 PM
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You have a picture for the speedo/tach circuit board like the ones you posted on this thread.
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Old Nov 15, 2010 | 10:18 PM
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Originally Posted by Oldguard 7
You have a picture for the speedo/tach circuit board like the ones you posted on this thread.
It might be here.
http://willcoxcorvette.com/advanced_...p?category=RIH
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Old Nov 16, 2010 | 06:32 PM
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Don't know if I do or not Sarge... Let me check.. brb..
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Old Nov 16, 2010 | 06:36 PM
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Nothing is traced out on the circuit like the one above, but with these pictures figuring it out should be a snap. If not... Post again. I'll be here



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Old Nov 16, 2010 | 09:47 PM
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Thanx. I have no dash lights and when I pulled my instrument cluster, I also noticed that some of the thin copper "lines" were broken as well as the one of the ones where the connector fits into was folded over. I'm going to purchase another circuit board. I suspect I have a problem in the wiring but since the circuit board I have is in bad shape. Thanx again.
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Old Nov 18, 2010 | 09:46 AM
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Sarge, here is the link to the circuit in the forum sale section. http://willcoxcorvette.com/product_i...ducts_id=25310

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Old Aug 5, 2022 | 02:43 PM
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Does anyone have a picture of the 79 C3 circuit board installation. I am not sure if I have all of the nuts in the right place.
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Old Aug 5, 2022 | 02:50 PM
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I think I may have damaged my oil pressure and voltmeter gages when I installed my new circuit board on my 79 C3.
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Old Aug 5, 2022 | 03:07 PM
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you should post a new thread to your question, this one is very old.. but i do like the OP avatar.. wonder if updated


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