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3/19/14 7:21am - Original Message: 'Explain this to me..........'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600

Ok so Last night was the maiden drive of the year. Over the winter I replaced my fuel gauge ( no more bounce) and also replaced the printed circuit board. Everything was working fine as I headed down the road last night. After I parked the car and it sat for a few hours I got back in to head home and noticed that I had lost power to my clock, oil pressure gauge, voltmeter and ac blower. Needless to say I drove home without event. When I pulled into my garage and turned the car off, my tach needle pegged out. I restarted the car and the small gauges and blower all started working again, yet the tach remains pegged.


Any thoughts as to what the heck is going on here???


Rook


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3/19/14 8:22am - Reply: 'Re: Explain this to me..........'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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

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The Rook said:Over the winter I replaced my fuel gauge ( no more bounce) and also replaced the printed circuit board.


That's the first place I would look for a problem, Dan. Ouch  It's possible the circuit board(s) are a little loose in the sockets, or possibly the panel is loosing it's ground.
The tach pegging may or may NOT be related, but my guess is that it is. A pegged tach can also be a faulty tach filter, located in the wire(usually a white wire) close to the distributor.
Did you replace the circuit board for the tach/speedo also, or just the one for the center gauge cluster?


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3/19/14 6:02pm - Reply: 'Re: Explain this to me..........'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600

I had the instrument panel out and tested everything 2 and 3 times, I ran the motor 30 minutes when I tested it,  and it all worked fine. Its just odd that those particular items were acting up. The fuel gauge worked perfectly. The tach board was changed several years back and hasn't acted up at all. I just hope this isn't a sign of some kind of major ground issue.

Other oddity is that now the temp gauge wont go up past the second mark ( 160 degrees I think).

It always ran higher than that (right around 180-200), even though I put in one of those new fangled aluminum radiators. I tested the gauge and got it to peg out to ground, so I assume the gauge is good. It wasn't much over 50 degrees outside yesterday, so I may not have got the car hot enough.....there's a first, a C3 owner complaining that his car is running too cold.....




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3/20/14 11:04am - Reply: 'Re: Explain this to me..........'
california68 Lifetime Member
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Yorba Linda, CA - USA

Vette(s):
1968 convertible, small block, auto, pw, pb, ps, air, 3rd owner CA black plate

Joined: 3/19/2008
Posts: 53

In regards to the temp gauge issue, Willcox has a video and a tech article on the subject.  see this link for the tech article:  http://willcoxcorvette.com/instructions/Temperature_gauge_help_page_NEW_Revised_R3.pdf

If you had the unit apart, be sure that the fiber washer is in the correct location.  Good luck!




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3/20/14 12:01pm - Reply: 'Re: Explain this to me..........'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

Possibilities

 Double check Gauge fuse 10 amp. I would pull it and physically look at it, possibly ignition switch (since it is intermittent), ground (pillar drivers side) if tach separate might be the connector to center instrument cluster not locked into place.



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3/20/14 6:48pm - Reply: 'Re: Explain this to me..........'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600
Actually the parts came from willcox. I reviewed his library several times during install. I'll check the fuse and the grounds.

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4/12/14 7:40pm - Reply: 'Re: Explain this to me..........'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600
Ok the saga continues. I discovered that this issue happens only when the lights are on. Lights on dead clock, temp, and volt gauge. Lights off everything works fine......

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4/13/14 11:49am - Reply: 'Re: Explain this to me..........'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395
I'm following this saga.....I hate electrical issues!

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