Andym

[Andym]

Just got a C4 and last night went out for a run but dash lights went out once my headlights were on any ideas ?

 

[Forrest Gump]

Could the display dimmer switch be turned down too far?

 

[Stingray]

Have a read of this link which explains exactly your issue,

Instrument Panel Light Problem--89 Vette - CorvetteForum - Chevrolet Corvette Forum Discussion

C4 Tech/Performance - Instrument Panel Light Problem--89 Vette - When I turn headlights on at night, the instrument panel lights fade completely out when there is no light in the cab. I can shine a light in the hole at the top left corner of the speedometer and they brighten up. Take away the...

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