Help with Vehicle Audio Sound Board Design

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It might be safer to add a small speaker than try to mess with a bridge audio output and inductive speakers and dynamic radio switching unknowns.
Engine running might be possible from the instrument panel or tach signal.
 
Tony Stewart said:
It might be safer to add a small speaker than try to mess with a bridge audio output and inductive speakers and dynamic radio switching unknowns.
Engine running might be possible from the instrument panel or tach signal.
Click to expand...
So there is someplace that only receives +12VDC when the engine is running, and I could connect my circuit in parallel to it? By the way, I have a 2006 Pontiac Grand Prix GXP with the V8 engine.
 
For Item #1, it turns out I still need the relay for the constant-to-momentary segment. Though, I may replace the bigger Bosch relay with a general purpose PC board mount relay.
 
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