On the PS2 / DVD / PLAYSTATION / VCR you should run a direct feed off the battery to those devices
of 10 guage or higher. You should have a independent ground for each device and also on the inverter for the PS2. You should break that main feed circuit with a relay hooked up only to the pink acessory wire circuit - located under the dash and below the steering wheel. The H2 is designed to be disabled by ONSTAR in 18 posistions throughout the vehicle in the event of a reported theft. As far as the heated seats you probably shorted them or unpluged a daisey chained system when you fidhed the wire through the seats for the monitors.
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