Hello, I am adding a trunk release button to my car and I need some tips what to use to prevent current being sent back to unknown components in the car's key-fob radio receiver. The car currently has a wireless trunk release that operates a small motor (~1.5-3A @ 12V) to release the trunk latch when the button is pressed on the fob. The receiver may trigger a built-in relay and if so, I'd have no problem adding a switch... or it may be all solid state and require protection, I just don't know without buying another one and tearing it apart.
Assuming it needs protection... I will be tapping in to the wire on the harness that comes from the receiver which provides +12.6 to 14V for about 0.5 seconds and I am adding a 3A fused momentary switch that will provide the same voltage to the wire for as long as the button is pressed.
Will a simple diode placed between the tap point and the fob receiver will be sufficient to protect the unknown circuitry or should I run new power wires for both the switch and the motor and isolate the receiver by making it so it only trips a relay?... or is there a better solution?
Assuming it needs protection... I will be tapping in to the wire on the harness that comes from the receiver which provides +12.6 to 14V for about 0.5 seconds and I am adding a 3A fused momentary switch that will provide the same voltage to the wire for as long as the button is pressed.
Will a simple diode placed between the tap point and the fob receiver will be sufficient to protect the unknown circuitry or should I run new power wires for both the switch and the motor and isolate the receiver by making it so it only trips a relay?... or is there a better solution?