1985 Supra no spark??

Have 1985 supra was getting no spark. First replaced ignitor and coil with used one it ran for a while then no spark.Replaced coil and igniter with used one again no spark, Changed relay and fuse it
ran again this time for around 20,000 miles. Alt light came on so came home battery went dead tried to restar with charger on batt. but no spark. Will I get no spark with bad alt. or is something else causing no spark!!! Don't know if there was an alam at one time and kill relay remains somewhere. !!!

do you have a cam position sensor if so check it also check your grounds go to the ecu and find that you are getting all grounds at the pins. i just went through this so i know what your going through