2000 9400 international instruments cluster

The other day, the speedo and tach stopped working while running down the road. Tapped on the center of the cluster, gauges came back to life.

Here's the odd thing. A week before that happened, the voltage gauge was reading 12. Thats all the higher it would read. Truck has almost new batteries and alternator on it, I checked them and the output with a OHM meter, it showed charging around 13.6 - 14.2. So it was changing correctly, the gauge just wasn't reading right. We replaced the voltage gauge and still shows low charge.

Has anyone experienced this? I'm told the main cluster (speedo and tach) control the other gauges. Trying to see what else to check before I purchase a new cluster.

 

Thanks @Heavyd

This truck has a N14 in it.

Any idea what pin I'd need to check?

 

I appreciate that. I'm gonna go check that out next.

One thing I did try is I pulled the volt gauge out, it's the 4 stud push in style, and it showed 12 volts to a couple those posts where the gauge plugs in but it showed 13.5+ at the batteries. Put a new gauge in, same deal.

 

I wanted to update what my issue was on this truck. Hopefully it might help someone in the future.

@Heavyd , just wanted to thank you for the tip on the purple wires (fuse holder wires) that connect together at the starter. I found 1 that was broken off from the ring terminal. After fixing that, unfortunately my volt gauge was still reading incorrectly. 12 was all it would do.

I think what might have happened was the one wire that had broken from the terminal arced and possibly shorted a circuit in the cluster.

I ended up replacing the center cluster circuit board (the one for the tach and speedo) and that fixed my problem. $512 for the circuit board. You reuse your gauges, light bulbs, indicator light housing, and low air buzzer. Not a bad job, just a pita to track the problem down without having a way to test that circuit board, so once I fixed the wiring and ran outta ideas, I bit the bullet and replaced the board.

Thanks again for the help!