No dash lights suddenly, just the small gauges, on the 77.

[Grit dog]

Slightly different issue than most of the posts about cluster lights.
All the lights worked last time I drove it at night. Been only day driving it for a couple months though.
Last night took a spin since I had the headlight on for a couple hours making light in the garage (power has been out for days).
Truck has 2 healthy batteries that both get charged so it started fine, however noticed that only the 4 small gauges had no light. Big gauges, gear selector radio heater etc all have light.
Haven’t had a cluster out of a squarebody in 30 years, so no memory here.
Are the 4 gauges powered by a single bulb and I may have just cooked that bulb, or is there another plausible diagnosis?
Thanks!

 

[bucket]

There's a few bulbs in that area. My hunch says there's a problem in the printed circuit since they all quit at once.

But it is possible that some bulbs quit or the bulb holders have dirty contacts and they failed one by one, but went unnoticed due to daytime driving.

 

[Grit dog]

Hey thanks. My guess is the circuit board then.
Now that I think about it I’ve only driven it a couple times since driving at night last and they all worked.
Doubt all of them on that side died basically at once.