HELP... Instrument Cluster GREMLINS????

[mamba_888]

I have a 1981 280zx Turbo.

 

I removed my instrument cluster and replaced the speedometer from the 85mph max to the 130mph max (part is from a Canadian car). I replaced all the cables and connectors correctly that goes in the back of the instrument cluster circuit board. I put everything back and successfully see all the following:

 

1. the cluster lights up,

2. turn signals blink, hazards work

3. fuel gauge shows correct level

4. temp gauge shows correct temp

5. OK button cycles and when pushin check button, returns "OK"!!!

6. Tach is showing good RPM.

 

So it looks good right... NOT!

 

Here's where I need your help. Every so often, specially on a very hot day

(don't know if that is the real symptom) the instrument cluster goes nuts and the following happens:

 

1. When turn signal is used to turn left, the right turn arrow blinks.

2. When turn signal is used to turn right, the left turn arrow blinks.

3. The fuel gauge is pegged to full (needle to right) instead of near empty.

4. The temp gauge is also pegged to VERY HOT (needle to right) which is also wrong.

5. The tach is jumping up and down when turn signals are being used!

 

Seems like the polarity is reversed intermittently!

 

PS. Signal lamps outside the car is normal and correct when using turn signals left or right.

 

After a driving a while, the instrument gauge returns to normal! EEEK!!!

 

HEEEEEEELP!!! GREMLINS on the loose!!!

 

Any ideas, please?

 

Thanx.

[iaconsultants]

Check your grounds, it is possible you did not ground it well. You can use some allegator clips to make a temporary ground to see if that helps or resolves the issue. Good luck

[mamba_888]

I was thinking that. Thanx for the heads up. I will go ahead and try it.

 

Check your grounds, it is possible you did not ground it well. You can use some allegator clips to make a temporary ground to see if that helps or resolves the issue. Good luck