Electrical instalation

Hello everyone, I need Your help. I looking for the circuit that gets 12v when the engine starts and loses power when the engine is turned off. It is very important that it loses voltage when the engine is turned off. Thank you in advance for your help E320 2001r. 4-matic WDB2100821X069801

Hello everyone,

I need Your help. I looking for the circuit that gets 12v when the engine starts and loses power when the engine is turned off.
It is very important that it loses voltage when the engine is turned off.

Thank you in advance for your help

E320 2001r. 4-matic
WDB2100821X069801

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