head lights pulse after bypassing my bulkhead

So my Brother was working on his '70 Cuda and told me he bypassed his bulkhead by running a 10ga wire with a fusible link from the threaded stud on his alternator to his starter relay. He claimed that it made a huge improvement in his car overall.

I had heard of this bypass before and figured it sounded easy enough. I was in between projects the other night and figured I would give this a try in my '74 Duster.

I ran a piece of 10 ga wire with a fusible link from the alternator to my starter relay. I fired it up and this is where I feel like an idiot. At idle it us fine but at 2500 and higher the headlights pulse. At 3500 they flash even faster.

I shut it off and checked to see if I had any lose connections or had lost a ground. I couldn't find anything that jumped out at me.

I was being pressed for time so, I swapped the voltage regulator and restarted it. It made no change.

By now I was out of time and couldn't mess with it any more. I disconnected the battery and had to walk away from it.

I am hoping to get back to it this weekend. I feel like an idiot and am missing/doing something stupid. Anyone have any clues?

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