early bronco solenoid

Steve83 said:

But not on an eB or any other vehicle you'll work on, as I said above.

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Are you sure? Here’s one example...
http://www.2040-parts.com/93-98-for...-abs-solid-state-relay-f3lb-2c013-aa-i963426/

https://www.amazon.com/Standard-Mot...automotive&vehicleId=1&vehicleType=automotive

Steve83 said:

Do auto-parts-store employees understand what they're selling?

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When someone asks me for a starter solenoid I'll ask "the fender mounted one?"
9 times out of 10 they'll say "yup".

Be understood by those you are talking to?
Or be a pedant?

OK, back on subject.

You have ignition switched power that was feeding your old HEI. Take that wire and splice in the "I" wire off the solenoid. The "I" is a secondary output off the solenoid to power the ignition while cranking the engine. Originally a bypass to the ignition ballast resister. With the ballast resister removed in an unknown manor by an unnamed shop they may have accidently deleted the bypass "I" wire.

So put the ignition wire (the voltage regulator wire works as well) and the "I" together and that will power the computer in run and crank. Just resplicing what someone unspliced sometime ago.