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

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Grit dog

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Location
Auburn, Washington
First Name
Todd
Truck Year
1986, 1977
Truck Model
K20, C10
Engine Size
454, 350
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!
 

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