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Topic: 1977 Tach Problem

in Forum: C3 Electrical


1977 Tach Problem

Posted: 8/2/05 8:22am Message 1 of 4
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Posts: 43

I have a 77 Vette and when I shut off the car the tach is at 6,000, when I start the car it buries itself past 7,000.  HELP!

Thank you in advance.




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1977 Tach Problem

Posted: 8/2/05 7:39pm Message 2 of 4
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
What'er ya gonna do? You can't hold back a 'Vette when it wanna go!!

Sounds like the printed circuit board(on the back of the tach) is damaged. Did this just happen all of a sudden, or has there been some fluctuating of the tach for a while? Disconnect the "tach" wire from the dist. and see if the tach goes to "0" with the key on.
If disconnecting the tach wire does not change anything, then the problem will be in the tach, or the circuit board.(possibly a ground prob., but that would normally effect the other gauges, also)
If it does correct the problem, then you need to replace the ign. module, most likely.



btw....I see that your '77 has a white int. Is it all white, or does it have a "two tone"? The two tones are very rare!!Adams' Apple38566.8216898148


Joel Adams
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1977 Tach Problem

Posted: 8/3/05 7:28am Message 3 of 4
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Thank you for replying.  The problem occurred all at once, no indication of a problem going to happen.

The interior is indigo blue and white.




1977 Tach Problem

Posted: 8/3/05 10:58am Message 4 of 4
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Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
Sorry to high jack the thread, but Adams; how do you see the member's pictures?  I don't see it in the profiles.


in Forum: C3 Electrical


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