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The older units (like ours) had the PD9100 converters that accept the Charge wizard add on. Newer units may have a PD9200 converter and they have the Charge Wizard built in, they don't need any add on.
Check what DT is putting in now. Or when you get your trailer look at what installed.
They do make a plug in monitor for the PD9200 units so you can see what its doing.
Cheers,
Bill
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