Ok. The p1684 just means that you disconnected the battery, nothing to worry about. I searched both the service manual and a code database and the p1530 does not show up as a code that Chrysler uses. I wouldn't worry about it, becuase your problem is related to the p1391 (intermittent loss of cam or crank signal) and the p0320 (crank position sensor circuit).
Where the bellhousing meets the engine lies the crank position sensor. If you veiw the powertrain from the left (driver's) side the sensor is at about the 2:00 position on the bellhsouing. It goes down in and runs off a tone wheel on the flexplate. It has a single 10mm bolt that holds it in. This sensor's signal is needed for the van to have spark. When this sensor drops out either intermittently or fully, the van will either cut out or die.
With the van cold to avoid burns from the exhaust crossover pipe, reach back there and find the sensor with your hand. Follow the wiring from it back to the main harness and make sure the wires aren't melted together. They can melt together from the exhaust crossover pipe heat, this will take the signal down. If you find the wires ok, replace the crank sensor. I prefer using a Mopar sensor only, I've seen way too many aftermarket sensors not work right out of the box.
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