The after market radio (Jensen with DVD player and 7" screen) in my '97 SL320 doesn't seem to be working properly. It acts like it's losing the memory whenever the ignition is shut off, but not all the time. Also it takes about 20-30 seconds after the car is started for the radio to come on. Looking at the Crutchfield site for some information, they don't list any installation information for a Jensen radio, however while looking at an Alpine they mention that the yellow ignition wire and the red always hot wire should be reversed for proper operation. Sounds like this may be the problem. Any insight into this would be appreciated.

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'97 SL320