Using 5v To switch 12v supply? (ATtiny in car use)

BillO:
Are you sure you have the pin designations right?

Really sorry about that, It did work I just tried it again.. Turns out I forgot to set my arduino as isp before re-programming the ATTiny!
D'oh!

All works great now, I really appreciate all your help... Now to try and solder the circuit into a proto shield :smiley:
I'll upload some pics of the finished product, And If I do end up getting some Pcb's made up, I'll be sure to contact you as I'll give you one as a thankyou! (Plus the components! :stuck_out_tongue: )

You're welcome, and thank you.