LED polarity diagram for the instrument cluster (1 Viewer)

[John Young]

I seem to have LED's on the brain lately. Especially after I found more than 5 bulbs burnt out in the instrument cluster of our 1993 Middle East 80. I've been replacing LEDs and putting new LED lights everywhere it seems. Laugh if you like, but I can actually see things down in the corners, like the fuel pump relay.

Anyways, I have the dash apart again for ... reasons. I bought all the necessary LED's to replace everything in the dash. Unfortunately, the available LEDs are polarity sensitive and neither the instrument cluster nor the panel switches are marked--because they did not have to be with the incandescent bulbs from the factory.

I have read all the threads I can find in the Model 80 forum and while there is mention after mention of the polarity issue, I cannot for the life of me find where anyone has posted a polarity map for the instrument cluster or the panel switches. I'm hoping I've just missed it. Does anyone know if such a map exists?

My next step is to resort to the wiring diagram which makes my eyes hurt just thinking about.

 

[ProjectsNMotion]

I recently swapped (almost) all of the bulbs in my gauge cluster with LEDs. I skipped the low fuel warning light because it's supposed to vary in brightness and an LED simply won't do that in that circuit.

The way I went about it was installing each LED and then applying 12V power, from a bench top power supply, to the correct terminations where the chassis harness connectors plug in. I referenced the wiring diagrams for the terminal numbers and polarity. It really didn't take very long doing it this way. 15 minutes I think?

Cheers

 

[John Young]

It took me a lot longer...
Here is my results:

The only one I could not figure out was the A/TP light. Apparently it is not working on my truck. I put the transfer case in neutral and my understanding is that it is supposed to light up. It did not. So I left that one as incandescent.

I was a little apprehensive about applying voltage to my cluster to test. I did it by a combination of tracing and trial and error, plugging it into the dash to check whether the lights would come on when I turned on the ignition but did not start the car.

 

[thebovees]

What LEDs for the transmission indicator?

 

[veiloctane]

It took me a lot longer...
Here is my results:
View attachment 2477707
View attachment 2477708
View attachment 2477709
View attachment 2477710

The only one I could not figure out was the A/TP light. Apparently it is not working on my truck. I put the transfer case in neutral and my understanding is that it is supposed to light up. It did not. So I left that one as incandescent.

I was a little apprehensive about applying voltage to my cluster to test. I did it by a combination of tracing and trial and error, plugging it into the dash to check whether the lights would come on when I turned on the ignition but did not start the car.

So glad I found your polarity map I needed this BAD!!!!!

 

[veiloctane]

What LEDs for the transmission indicator?

i believe if you continunity test on socket D4 would be the negative