Yes, dual power and ground.
Testing so far:
I got 6900 @ 1.3 actual on 17.9v rest.
Did not measure voltage drop.
You can get close to 8k out of it with a rise closer to 1 ohm.
With a rise to 2.12 I still got 5290 out of it.
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On 12v system:
3100 @ 1 ohm nominal with actual rise to 2.67 ohms (Drop to 13.6 volts)
4910 @ 1/4 ohm nominal with actual rise to 0.71 ohm (Drop to 11.6 volts)
I'll be doing more 12v testing to include 1/2 ohm nominal testing when I get my Jeep put back together (changing it over to 12v). The above was done on two Powermaster D3100s in Derrick's Explorer.
Resistive testing @ Factory = 5200 @ 14v @ 1 ohm
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All clamp tests done a full ~6-7 seconds into the burp on my Extech Power clamp :
http://www.extech.com/instrument/products/...399/380976.html