Alternator won’t charge battery with Holley sniper

Hi all, I have a 73 Cuda and just installed a Holley sniper system. If you know this system, you know that you need a clean 12 volt source on key. So, as per many recommendations, I used the blue and brown wire on the steering column. I cut them and ran them to a relay and the car runs great (see photo below)... But the alternator won't charge the battery. The alternator and volt regulator tested good. I think it's because I cut the blue wire... ???

Can I tap back into the blue wire...

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