How to bench test dash backlights.

[Bongo Bob]

Hello everyone,

I'm trying to figure out how to bench test the dash lights for my 67 GTX.
I've tested the gauges and they work fine.
I want to confirm that the dash lights work.
I've installed all new bulbs.
How do I do it?

Thanks!
Greg

 

[moparedtn]

1. Get the factory wiring diagram.
2. Obtain a source of 12VDC (I always just use the car battery, using small jumper wires).
3. You have a voltmeter with a setting to test continuity, yes?
The rest should be fairly self-explanatory.

 

[BeepBeepRR]

Found this posted on this site. Here is that thread. I believe this is a 66 cluster but the objective is the same. Follow the circuits on the board.
https://www.forbbodiesonly.com/moparforum/threads/instrument-cluster-issues-66-plymouth.93820/

I edited this picture below to show you where they run on the PCB.

 

[70chall440]

I always test each bulb individually, once I know all the bulbs work I think follow the 2 sides of the bulbs and one side is 12V and the other is grd, apply 12V and they should come on.

 

[Bongo Bob]

Thanks for the help guys! Success!!
The circuit boards were very corroded. I cleaned them up with steel wool. I also replaced all the lamp "sockets" and bulbs. It worked out well.

 

[bandit67]

My 73 had a red, yellow and orange pin out on the dash wiring harness I used to check all the lamps at reinstallation time. Does Gregs 67 have something like that or was that used on later models.....