HOW TO INSTALL CRACKEDBACK'S HEADLIGHT HARNESS

Dana67Dart said

I get why you would tap into power from the alternator post, but if part of the reason of doing this is to bypass the bulkhead connectors it doesn't do that when the engine is not running. That is all I am pointing out. Did not mean to stir up a hornets nest.

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So why would attaching to the battery be your preference? Or maybe we're reading into it something you didn't mean. ???
That was the impression we (I) got when you wrote

Dana67Dart said

I just found the main power attachment odd.

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PS. I have had to drive with an essentially dead alternator with the lights on since installing the relay system. Although not ideal, the lamps are drawing less current than when the alternator is running. So its a longer run, but the voltage loss due to circuit resistance is less.