Speedometer power issue

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Dec 8, 2012 | 12:38 PM

Epsilon

Thread Starter

6th Gear

Joined: Jan 2012

Posts: 6

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Speedometer power issue

I recently put a new printed circuit on the gauge cluster which brought all of them back to life except the temperature gauge which I am not sure how to rerun.
But my most pressing issue is that I also replaced the printed circuit on the speedo. I hooked them both back up before reinstalling the whole dash and I have no response from either the Rev counter, speedo, or any of the lights.
I don't know what the first step I should take is. Also does anyone have a link to a diagram showing which bulbs go where so I can make sure I have the amperage in the right place?

Dec 8, 2012 | 12:41 PM

Mike Ward

Race Director

Joined: Jul 2001

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The indication on the speedo is purely mechanical, no electronics or circuit boards involved. Did you hook up the drive cable?

Dec 8, 2012 | 01:13 PM

Epsilon

Thread Starter

6th Gear

Joined: Jan 2012

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I did hook up the drive cable an it seemed very snug. I'm just baffled why nothing responds at all. I hate to replace the whole drive cable if I don't need too

Dec 8, 2012 | 06:20 PM

0Willcox Corvette

Former Vendor

Joined: Aug 2006

Posts: 76,656

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From: Jeffersonville Indiana 812-288-7103

St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15

If you put a printed circuit on the speedo tach housing, safe bet the car is 1978-1982... With this in mind and if you have cruise control.. pull the cable loose from the transducer and attach a drill to it... see if the speedo works. If it does then you either have an issue with the transducer, the lower cable or the drive gear in the tranny.

If it fails you have a cable issue between the speedo and transducer.

On the tach.... there is a ton of info on your tach on my site. If you post the year i'll guide you to that info.

Willcox

Dec 8, 2012 | 06:39 PM

Epsilon

Thread Starter

6th Gear

Joined: Jan 2012

Posts: 6

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I should have included that in the original post, but yes you are correct it is a 78.
I have not tried the drill test yet, hopefully that will come tomorrow and I can start getting it all back together.
I also discovered earlier when testing more electrical that I have a headlight issue now as well. I'll start a new thread for that one.

Dec 9, 2012 | 11:19 AM

0Willcox Corvette

Former Vendor

Joined: Aug 2006

Posts: 76,656

Likes: 1,847

From: Jeffersonville Indiana 812-288-7103

St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15

Info on your tach can be found here..

http://willcoxcorvette.com/advanced_...&keywords=tach

and here..

http://willcoxcorvette.com/advanced_...s=tach&x=0&y=0

And there is a board installation video on youtube... if you do need a new board.

Willcox