ok so to start ive searched and not found the answer.
heres the problem
i installed a jvc head unit that i had in my previous car.
had to join a wiring harness together, so o solder and heat shrunk all wires
radio turns on when i turn the key and works fine then when i go to start she starts to turn over then shuts down.
if i disconnect the head unit she starts good as ever.
so both run separately but not together
have i missed something here?