Where is the fuse for the interior lights on a 77 corvette

which fans coolant or interior check fuses relays and connections then test fan which ever one is problem and to find out what is what read owners manual and covers of fuse boxes

the wires coming from the column are for your brakes and blinkers. check fuses, i mean pull them out and inspect. on older cars sometimes they need to be pulled out and put back in from rust. most of the fuse boxes back then were made with metal that will rust and make a bad connection. try that and get back to me. also check with test light on both sides of the fuses.

did you check the light switch? or a broken wire

check fuses

should be same fuse for the interior light if the interior lights come on its most likely a burned out bulb

i think that age still had fuseable links at the starter it would be flex able wire at the starter about 3'' long before the wire turns stiff

Replace the light control switch and if it is a separate adjustment the Dash board or Interior light brightness adjuster. Most likely it is the Light switch so start with that. This assumes all interior fuses and fuses and relays in the power distribution block under the hood are good.

Check the door switch. Mine went out and I had all sorts of problems from intermittent interior light flashes, alarm going off when locked and interior lights going on and draining the battery.
The switch cost about $40 from the dealer as I recall.
Good luck!

Have you tried pushing the button on post or in door jamb that operates interior light to see if maybe it has a sticky spot, and needs replaced?

All the diagrams for your corvette can be found here:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008370b

Headlight wiring is towards the bottom of the page.

Hope this helps, have fun wrenching on that vette.