voltage drop d-block to amp?

First I'll explain my setup.  I have 2 amps, both Alpine, T220(components) and MRD-M605(sub), 1 fuxed stinger d-block, 1 stinger ground d-block.  1/0 gauge from power and ground to d-blocks, 4ga to sub amp, 8ga to comp amp.  Here's the situation...

I was wiring my new Alpine MRD-M605 couple days ago. Worked fine, I then re-arranged the 2 amps, 1 for comps, 1 for sub, thats when problems occured. When I did that I must've messed with the power/ground connections somehow. Anyway I turned it on amp gave me VLT error, meaning excessive voltage.. shut down. I moved the connection wire around to see if its a solid connection it is. Turned it on again, same thing but this time with a CUR error or too high of a current.. shut down. This happened ONLY with the sub amp, the comp amp worked fine all the time. So then I disconnected the battery terminal, took out the power and ground connection from the d-blocks to amp pushed the wire further to make sure there wasn't any exposed strands of copper wire and secured it a little tigheter this time. Now its working fine, however I noticed a slight voltage drop from the d-block to the amp. d-block reads 14.3, amp reads 13.4, but with the engine off they read about the same. Is that normal?

In my opinion, measuring voltage drop is the absolutely best way to check for high resistance connections.. crank up the amplifiers and measure voltage drop while under full load.

To stimulate discussion, can anyone give me an acceptable resistance reading.. and an acceptable voltage drop reading?

Jim