All the lights are flickering

[Tacchino]

Been out for a blast tonight and have realised that all the lights on the car are flickering.
That headlights, dashboard lights, interior lights ..... all of them!

The cars got a new battery and new alternator (fitted by a TVR specialist within the last 50 miles) plus it's had its "big fuse" replaced.

Is there a voltage regulator or some other device that may be causing a fluctuation in voltage.

When the engine isn't running the lights are nice and stable.

[C3BER]

First check if you have a good positive connection from your battery. Vibration whilst driving will cause the positive feed to move and arc.

Then it could be an iffy alternator.

My guess would be a loose positive feed.