nserpa9248

After reading the info you guys have given me, i have gathered this (Let me know if im right)

The 50mv output from the shunt may be too low for the fusion brain to pick up, or notice the .000xxv changes. Can a hardware developer of the FB let me know if it is sensitive enough.

They also offer a 100mv versions too..i imagine that one would give me a more accurate read.

With your math of 50mv 150A shunt saying that for each Amp i am getting 1/3 mV. So, would that mean with a 100mv 150A shunt i would get 2/3mV for each Amp?
...figuring you are going by amperage rating divided by milliamp rating
Translating into 1A = 0.0006666V / 2A = 0.0013332/ 10A = 0.0066666

I agree with what was said about the shunt rating...I have also read about only using a shunt to 2/3 its rated power. The site i listed above states that as well.
My sub amp is rated for 50A (fuse rating...it never draws that much)
My 4ch amp is rated for 60A (fuse rating...it never draws that much)
I am aiming to get atleast a 100A rated shunt.

Next, as far as placement i would be placing it on the +12v power wire right before each amplifier, after my distro block.

As far as the voltage..could i use a voltage divider (as discussed earlier about getting vehicle voltage) to get the cars ~12v down to what the fusionbrain will understand? (0-5v)
Or would that mess with the reading from the shunt?

I think the hall-effect way will be too expensive, to bulky, and too time consuming to set up right....i would really rather use an analoge shunt.

Thanks for all the help guys,
-Nick