Ignition/starting problem

Thanks for the replies.

It seems most likely it's a problem with the brown wire circuit - the car starts instantly using the button and runs great.

To bypass the ballast resistor I connected the two terminals that normally go to the ballast resistor to each other.

I realize using the button changes the way the system works - my point was that it couldn't be causing the problem when using the key as none of the original wiring had been removed.

I think I'm going to check the brown wire circuit and if there's not an obvious issue just fit a permanent starter button so I only need to use the IGN1 circuit.