Could be any number of things. Make sure the battery and alternator terminals and wiring is secure. Check the wiring loom connectors under / near the steering column. Pop them open and check all the pins and sockets show no signs of heat or carbon. Wiggle the key while the engine is running and use a screw driver handle to tap the the switch and wiring looms too.
Check that the fusible links near the top rear of the battery are fully intact and that their connectors are tight.
In the past, I have found fuses that look okay, but are open circuit or the holder is slightly loose.
There are a lot more things to check, such as the wiring loom to the fuse box in the D/S kick panels. Use a screw driver handle to tap around the fuse panel while the engine is running. If all else is ok then remove the fuse panel and check it has no signs of heat or carbon.
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