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oh i thought the 600 had the remote start.
dual polarity should off both triggers for door lucks and parking light output maybe trunk output. Built in relay, they usually have 1 wire that u connect to whatever the trigger is say u needed postive u connect the wire to 12v and the other wire to the lock or whatever u needed it for. Built in relays are just easier for the installer, anything can be done externally.
-Brandon
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