GMC COIL

Crank No Start, No Spark, Check Coil Lead Twelve Volts, Check Coil White Wire, Got Light Flash(icm Good). Changed Coil Now It Is Arcing...

I Have Changed The Starter, Battery, Alternator And Coil Pack. And I Can Start My Jimmy After A Charge And It Will Go. But It Loses Lights...

Does Heater Coil Have To Be Installed Under Dash Before It Can Work

Need To Replace A Coil Pack But Don't Know Which One To Replace. Is There A Way To Check The Pack To See If It Is Bad Or Good?