The only way I can start my car is putting a screwdriver on the starter relay. Ive replaced the starter relay already and the first few days it started normally but now it wont start with just a turn of the ignition. What could be causing this?

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Ronnie
http://www.cardomain.com/ride/2714941

Ignition switch, neutral start switch, faulty wiring somewhere. Time to break out the test light and check for continuity.

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Casually looking for a Clifford hyperpak intake for cheap.

Start with the easiest to check first - test the neutral safety switch.
Then check the wires that lead to it for melted, bare, or broken spots.
Check all wires and connections to/from the starter relay.
Last resort - ignition switch.

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There's a difference between ignorance and stupidity.
Ignorance is not knowing any better.
Stupidity is knowing, yet doing it anyway.

This happened to me a week ago. After installing a radio and replacing some dodgy wiring the car just would not start. Only the way you discribe.

It took me two long evenings under the dash with a flashlight to find out that some previous owner had installed a very small anti-theft switch under the steering collumn.