I should have noted, when i was measuring resistance the ignition/HU was off, and when I was measuring voltage it was on.

With the ignition off and measuring resistance, its spot on. As soon as I connect the DCI it drops?

My alpine remote works fine.

 

it's quite possible that adding the (unpowered) DCI would cause the circuit's
resistance to drop if it provided a parallel path to ground. what's strange is
that some of your measured resistances have increased, which I don't believe
is possible if you're measuring from the same point with DCI connected and
disconnected. it does seem like you've had some measurement anomalies,
which could be caused by something of variable resistance like a loose/bad
connection. hopefully modifry can suggest some tests that will get to the
heart of the matter.