When I did this conversion in my car, I was having lots of issues, mainly with a factory splice in the white with red stripe wire coming off the alternator. (runs to a small ring terminal on the right side of the alternator). This is the wire that carries power from the alternator through the fusibale link system, into a the fuse box and charges the battery.
The splice I replaced was about a foot from the alternator. If the battery isn't charging I would investigate this wire. Check and clean all your connections while your at it and check all your fusible links.
I'm a little confused too by your statement of "not getting a charge light". The charge light in the voltage gauge should only be illuminated when the key is in the "On" position with the motor not running. If the light is off with the car running, then all is well within the charge circuit. If the light is illuminated all the time, something is wrong there!
Check voltage across the battery and compare to voltage at the alternator. They should be within a couple tenths of each other, and generally around 14.5-14.8v If the battery is low investigate the above connections.