Stop in for a cup of coffee

i am following the factory wiring diagram. I bought an nos full chassis harness , had an electrician come out and check the thing for continuity. It’s good. Yet I have no power passed the starter relay. So I’ve finally got a new starter relay in after waiting MONTHS. Hopefully that solves it.
Thats good as far as it goes.
Check each terminal (metal part) that they don't back out when you snap the connectors together.
Keep in mind that a continuity check done with an ohmeter only says the two ends are connected. It doesn't reveal if they are only connected by one strand.

Before you connect the battery, keep in mind that every wire loose wire end must be secure. The last thing you want to do is accidently ground the battery positive.