starts then stops

[supra3]

hi need some help, just bought a 1971 3500s which was of the road for a while and was trying to start it, it starts fine but only runs when the key is in the start position , as soon as i let the key go back to the run position it cuts out,could it be coil? condenser?or the live feed from the starter, or something else, cheers dave.

 

[harveyp6]

If it runs in the "Start" position on the key then you have the supply from the starter to the coil for initial start-up, but have no normal ignition supply. Test this with a testlamp to prove the point, and then you will need to find where you are losing the feed for normal running. Could be a fuse, the ballast resistor wire faulty, a faulty ignition switch or just a wire that has got knocked off somewhere.
Could also be that it's had the wrong coil (12v) fitted and the ballasted supply won't give enough for a good spark.

 

[supra3]

thanks for the reply, the car was outside for about a year and the carpet in the passenger foot well was very wet so i will look at the fuse box for corosion , about the fuse holder next time i am in the garage.cheers , dave.