156 2l selespeed goes limp when lights turn on
My 156 2L Selespeed blows a 10A fuse and goes into limp mode as soon as I turn the headlights on. After the fuse is blown the speedometer, heat gauge and the dashboard lights are dead. Only the selespeed light flickers and the car only has 1st and second gears.
The rear lights and front park lights are also not working but the headlights works on dim and bright.
The fuses (6&7) does not blow and even if I remove them, the 10A fuse still blows when I turn on the lights. I have also checked the globes and they all seem ok. I have checked most of the wiring in the boot and engine compartment but can't see any obvious problems.
Can anybody please help.