The exciter wire that you connected to the dash light wire needs to then be connected to the positive post of the ignition coil. When you are done both the dash light wire and the exciter wire will be connected together then attached to the (+) terminal of the coil.

The exciter wire has the job of using battery voltage to excite the fields inside of the alternator so when the engine starts the alternator will begin charging regardless of the idle speed. In your case the exciter wire is not receiving any battery current so it cannot excite the fields and make the alternator charge when the engine starts.

When the alternator spins fast enough it will release stored magnatism from the rotor on its own and begin charging (this is how a one wire alternator works and is why you have to rev up a one wire alternator to make it engage and start charging).... as you have experienced.

After all of this...If the engine fails to stop running when you turn the key off then you need a DA Plug which will make the alternator charge when it is suposed to and the engine will shut off with the key as it did before. Fifth Avenue has the DA Plugs for sale. Then you will live happily ever after. Thanks Randy

Fifth Avenue Internet Garage