Is it the cluster, or is it the car?

Posted by Bryan Thompson on

To power on and show 0RPM/0MPH, the 1984-1989 Cluster needs the following:
Two grounds (D1) and (D3)
The way to test a ground is to power it on and measure DC voltage.  Put the negative probe on the battery negative terminal.  Put the positive probe on the terminal you're testing (D1).  Plug in the cluster.  Turn on the key.  You should measure 0.00V.  If it's higher than 0.5V, the ground is bad.  Do the same thing for pin D3. 
One Full Time Hot pin (D3)   
The way to test a power is to measure DC voltage.  Put the negative probe on the battery negative terminal.  Put the positive probe on the terminal you're testing (D5).  Plug in the cluster.  Turn on the key.  You should measure battery voltage.  It should be at least 10.5V and less than 15.00V.  If the key was off, turn it on.  If the key was on, turn it off.  Repeat this test.  It should be the same.
Two Ignition Power pins (C16) and (D16)
The way to test a ground is to power it on and measure DC voltage.  Put the negative probe on the battery negative terminal.  Put the positive probe on the terminal you're testing (C16).  Plug in the cluster.  Turn on the key.  It should be at least 10.5V and less than 15.00V. Turn the key off.  It should be 0.00V.  Repeat this test with the meter red probe on terminal D16.
If these are in place and the cluster still doesn't light up and show something, the problem is likely in the cluster.
Thank you,
Bryan A. Thompson
batee.com Corvette

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