dash light only on if brake pushed and rear lights only work if rear fog is in on

[griff123]

dash only lights up when brake pushed and rear lights only work if rear fog switch is in the on position rear fog does not work only rear lights

 

[Sam]

Sounds to me like you might have some corroded earths.

Check the earths in the rear lights to see if they have rusted. Try and clean them up with a wire brush.