After reading my original post I guess I did clearly state what kinda circuit I need. Although my signal wire I will be monitoring is PWM, I think that is a non issue. Sorry for the inconvenience, hope I can still get a solution.
Here is what the circuit needs to consist of.
1) Signal wire
2) Battery(+) Voltage wire; (as this is automobile voltage will be between 12.5V - 14.8V)
3) Ground (I would assume!)
Here is what I need to accomplish:
Monitor "signal wire" ~~~> Voltage on this wire will be between 0.035V to 14.8(or = B+)
If signal voltage is > ≈ .75-1.0V Then
output = B+ Voltage
Else output = signal voltage
Does this make sense?