HA. I was like, what the hell, ya that's what that symbol means.
Then I saw the heart. Didn't know it did that
I changed my post. The voltage went up slightly with the known good battery. Still this is strange.
Another recap. The starter is getting approx 4.0-4.5 volts at the remote wire. This may be as designed, I am not sure. Speculating that there is a relay internal to the solenoid housing that the remote wire engages, which allows the constant (12v) signal to engage the starter.
Ran a second ground to the starter, and jumped it straight from the battery. It clicked, but did not engage and did not crank the engine. I think they may have given me a bad starter. I will go trade it in tomorrow hopefully. Then try my diagnostics again.
A couple of noteworthy things here.
1) When I turn the key to the start position the dash clock dims. LAN mentioned this in a thread a while back, but I cannot quite figure out what direction I should go, since it seems he blamed the starter.
2) I am worried I may have damaged some internal circuitry when I put the optima back in.
These electrical problems get old fast...