72 duster firewall wiring questions ???

Will most likely keep it under the hood just so its accessible in the future if I need it for any reason or if it ever needs replaced.

Think I understand what I need to do here:

1. Cut blue wire on engine side of bulkhead and plug into Terminal 86.

2. Supply 12 volts from starter relay positive post to terminal to 87 on relay.

3. Connect end of Blue wire leading up to Blue / Brown splice to output terminal 30.

4. Ground relay terminal 85.

Honestly this is probably a good thing to do anyway even if the voltage drop isn't more than .3V? Nothing saying a loose connection could not develop over time resulting in an overcurrent situation. The relay would prevent such such an occurance from creating a potentially serious issue like a burned up Duster... :prayer::prayer: