Dash lights

1999 Ford F-350 Dually 193000 miles
My dash lights keep going out. I have pulled off dash and replaced relays but I don't have any reference to what that cluster of relays behind radio are for
KELLY from United States 4 years ago  
KE
6 reports 
Toasterman12 from United States 2 years ago
Dash lights out and no radio
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