As tittle its on constantly but obviously at night its more visable
When i brake/headlights on/windows it comes up brighter and rev counter flickers a bit

Ive had new alternator, battery, 2 new extra earth straps from battery to bulkhead and engine, and cleaned up earths and its still exactly the same

Any ideas?

 

Could be fuse box or ignition relay.
What does the voltmeter read ?

 

Check the engine earth strap...

Martin

 

Was just going to say - bad earth somewhere

 

little blue wire lol it will be the wire going to the inner wing or the connector