Digital Dash Cluster
Thread Starter
Intermediate
Joined: Jun 2000
Posts: 25
Likes: 0
From: New Orleans La 70122 la
Digital Dash Cluster
my dash is reading rpm when its not connected to the distrubitor, plus i disconnected the tach wire from the digital cluster (pin C5) and it still reads rpm?
:cheers: I fixed my problem, it was the ignition coil, "secondary voltage punch through". it caused everything to blink
[Modified by Robert L Lucien Jr, 3:38 PM 9/19/2003]
:cheers: I fixed my problem, it was the ignition coil, "secondary voltage punch through". it caused everything to blink
[Modified by Robert L Lucien Jr, 3:38 PM 9/19/2003]
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Digital Dash Cluster (Robert L Lucien Jr)
So what! Why would you want to drive around with your tach disconnected?
Put a 1k ohm resistor from the tach input to ground and see if it reads zero.
Put a 1k ohm resistor from the tach input to ground and see if it reads zero.
Thread Starter
Intermediate
Joined: Jun 2000
Posts: 25
Likes: 0
From: New Orleans La 70122 la
Re: Digital Dash Cluster (jfb)
well, i do want my tach to work, but it should read (0) when disconnected. i was told the dash is picking up some RF signal from the distributor, so im looking at it from that angle; maybe i have a ground in the wrong place or something ????
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Digital Dash Cluster (Robert L Lucien Jr)
If it ain't broke, don't fix it !!!!!!!!
Tell me why your tach HAS to work like you think it should when the input is disconnected. GM didn't design it necessarily to read zero or anything else disconnected because they spent all their effort in making it work properly connected. What is the value of having the tach read zero when disconnected? You aren't making a bit of sense!
Tell me why your tach HAS to work like you think it should when the input is disconnected. GM didn't design it necessarily to read zero or anything else disconnected because they spent all their effort in making it work properly connected. What is the value of having the tach read zero when disconnected? You aren't making a bit of sense!
Instructor
Joined: Sep 2002
Posts: 210
Likes: 0
From: Southfield Michigan
Re: Digital Dash Cluster (Q1KSLVR)
Some analog tach's I forget the correct name air movement or something, read something besides 0 when un plugged. But when you run power to it it goes to 0... Then again my tach is digital. But may be the same principal at work.
With it connected and the car on does it read 0?
With it connected and the car on does it read 0?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Intermediate
Joined: Jun 2000
Posts: 25
Likes: 0
From: New Orleans La 70122 la
Re: Digital Dash Cluster (BookSmart)
when the car is running it reads RPM, but with the car still running and i unplug it, it still reads RPM and i know it should go to zero. the reason that this is a problem for me is that it is effecting my A/C electronic control, it blinks. the A/C control blinks at the same frequency as the tach. i think i need to check the ground.......thanks
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Digital Dash Cluster (Robert L Lucien Jr)
I have the most wonderful idea. Why don't you leave your tach connected and then it will read rpm correctly and your a/c control will also work correctly.
Thread Starter
Intermediate
Joined: Jun 2000
Posts: 25
Likes: 0
From: New Orleans La 70122 la
Re: Digital Dash Cluster (jfb)
:cheers: well i fixed my dash problem! it was the ignition coil. the primary and secondary coils, one for the tach and one for the spark plugs.
the primary which is for the spark plugs which gets its power from the battary tap on the distributor. when it fires it produce a magantic field across the secondary coil which sends pulses to the dash tach
what happen to my coil is whats known as "secondary voltage punch through"
this happens when th secondary coil loses its ground. voltage punch through sends the pulses back through the battary which makes everything blink A/C control unit
the primary which is for the spark plugs which gets its power from the battary tap on the distributor. when it fires it produce a magantic field across the secondary coil which sends pulses to the dash tach
what happen to my coil is whats known as "secondary voltage punch through"
this happens when th secondary coil loses its ground. voltage punch through sends the pulses back through the battary which makes everything blink A/C control unit