I may misunderstand your question, but why would you want "continuous" power. That isn't going to do alot for long battery life.
In a non-MB truck, I have the radio wired directly off the battery so it works when I turn it on with the ign. switch off. If this is what you're seeking, review your connections, especially ground.
Regards,
Mike Murrell
'91 300-SEL
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