Ok, I understand now. There'* alot of things happening when you first turn the key. There are many parallel resistances (ignition relays picking up, and many other loads etc.) that you're seeing, so the 3-5 ohms might not be a bad number, I don't know for sure. And I'm not sure that is the approach I'd take. Try to isolate things out by removing relays & fuses if neccessary. Those relays are tough to pull out of the sockets. I've used a regular pair of pliers with a gentle touch for relay removal and that has worked. When you turn something like the rear defogger on, initially you'll see voltage drooping especially at idle, but the alternator sholud have full field applied and boost voltage back up to nominal value 13-14 volts after a second or two.
2003 SSEi, Light Bronzemist Metallic - All Stock For Now
IBEW Local 261 Groton, CT
My other vehicle is a nuclear submarine.