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Topic: New dash is in..probs with Tach.

in Forum: C3 Electrical

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New dash is in..probs with Tach.

Posted: 4/11/09 9:17pm Message 1 of 17
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JimG
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Gloucester, VA - USA
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Vette(s): 1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition

Started the car up and it looks like the RPMs are stuck at 6500. Any idea what would cause this?  Did I miss plugging something back in?

Gauge us still sitting there with engine off.



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New dash is in..probs with Tach.

Posted: 4/12/09 7:36am Message 2 of 17
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Adams' Apple
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Duncanville, TX - USA
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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
The electric tach will sit just about anywhere with no power to it, so it appears something didn't get plugged back in completely. Since we can assume the tach was working before, then it's safe to say the connector is prolly just not seated all the way.


Joel Adams
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New dash is in..probs with Tach.

Posted: 4/12/09 11:11am Message 3 of 17
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JimG
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Gloucester, VA - USA
Joined: 1/29/2005
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Vette(s): 1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition
CHecking it now...


Lifetime Member #73

The Money Pit.... and my niece

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New dash is in..probs with Tach.

Posted: 4/13/09 7:24pm Message 4 of 17
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JimG
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Gloucester, VA - USA
Joined: 1/29/2005
Posts: 1453
Vette(s): 1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition
Still inop...checked plug in back, checked wiring...

 Ground maybe?



Lifetime Member #73

The Money Pit.... and my niece

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New dash is in..probs with Tach.

Posted: 4/13/09 7:32pm Message 5 of 17
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Adams' Apple
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could be a ground issue, but it seems that would effect more than just the tach. It may be a silly question, but...have you checked the fuses? A blown fuse, or no power to the tach, would cause the same thing.
Did you happen to change the circuit board with the dash?


Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

New dash is in..probs with Tach.

Posted: 4/13/09 7:39pm Message 6 of 17
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JimG
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Gloucester, VA - USA
Joined: 1/29/2005
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Vette(s): 1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition
No circuit board looked ok so I reused it...  Of course, now I've got issues with the winders not wanting to move...neither of them....

 *sigh*   Wiring diagram wasn't a help...I'll check fuses again tomorrow..  Maybe I missed one...



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The Money Pit.... and my niece

(click to see a slightly larger version)

New dash is in..probs with Tach.

Posted: 4/13/09 7:48pm Message 7 of 17
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Adams' Apple
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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
Did you drop the steering column down while changing the dash stuff? Maybe the ignition switch got moved, or bumped out of whack, and it's not completing a couple of the circuits needed to power this stuff.
The reason I say this is....the ign. switch on my 'Burban does the same thing....Sometimes, if I don't hit it just right, the windows , the HVAC blowers, and sometimes the radio won't come on. I have to "jiggle" it a bit to get them working....I'm just too lazy to crawl under there an adjust the dang thing...


Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

New dash is in..probs with Tach.

Posted: 4/14/09 4:12am Message 8 of 17
gurtz
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baton rouge, LA - USA
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Vette(s): 1981 dark metallic blue, dark doeskin leather interior, mirrored glass T Tops, 330hp/350ci GMPP crate engine, billeted aluminum serpentine system, Dewitts with dual spalls
If you did drop the column, I read in the manual that any foreign material can cause havoc.  I had to pull the column again, spray all the connectors with an electrical contact cleaner then I applied di electric grease.
 
All back to normal, but just about everything associated with the column went haywire till I did above.
 
Did you forget to put the lovely 5/32 screw fastening the tach to the dash cluster?  That might be loose.
 
good luck



New dash is in..probs with Tach.

Posted: 4/14/09 7:39pm Message 9 of 17
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JimG
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Gloucester, VA - USA
Joined: 1/29/2005
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Vette(s): 1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition
 5/32 screw fastening the tach to the dash cluster?

Don't remember seeing it.

My major concern right now is that the windows don't work. They did before I took the dash out. I checked all the fuzes and traced wires but I see nothing. Anyone know how the windows ground? There are no good wiring diagrams including the power winders...



Lifetime Member #73

The Money Pit.... and my niece

(click to see a slightly larger version)

New dash is in..probs with Tach.

Posted: 4/14/09 8:00pm Message 10 of 17
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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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
The power windows ground off of the relay...I do have the diagram for that...e-mail comming at-choo
Are the fuses "hot" with the key on?


Joel Adams
C3VR Lifetime Member #56    
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(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

in Forum: C3 Electrical


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