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You state that you measured 11 volts at the open circuit harness with the car running. You should be getting 12 volts with the engine off and 12 - 14 volts with the engine at say 1,500 RPM. It would appear that something is haywire in the supply circuits. A high impedence voltmeter draws next to no current. When the unit is connected any resistance in the circuit could be pulling the voltage way down. For this reason a test lamp of fairly high wattage is superior to a voltmeter.
Check the voltages at the two outlets with the unit connected and on. If you have a problem making contact with the plug in place, stick a fine pin or neadle right through the lead iisulation. Use the same ground connection as used for the unit so that this is covered within the test. Try to make this check when you are able to establish the fault condition is present.
Best of luck, intermittents are always a bugger to find.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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