Won't start ,turn ignition, all power works, no crank &clicking in glove box

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We believed it to be the catilac Converter causing it to stall and die randomly while driving but after further investigation we are unsure what the issue is, we've checked the starter , alternator, battery,Cadillac converter and all fuses. I believe it may possibly be the ignition control module but not sure and have no idea where it is or how to fix it ? Is it in the dash or w coil packs? Please help me!