Berlingo electrical woes

Hi I have a 2003 facelift berlingo 1.9xud

and she isnt very healthy at the moment we have a multiple electrical issues which am sure will all be down to one thing

heater blower not working
radio not working
rev counter not working
glowplugs not working
glowplug light on dash not working
immo not working (have fitted a single wire solenoid to pump so I can run the engine)
the center display lights up with eco mode then goes off

Any Ideas