The current going to the camera drops from a steady 85mA to about half, and sometimes zero, briefly, when the load is engaged.
1. Does that support the theory that the switching of the 4A load is momentarily diverting all of the current toward itself?
2. Does the lack of needed current to the camera explain why the voltage to the camera also drops?
3. If an inductor is used to maintain current, will it also maintain the voltage (assuming a diode and voltage regulator are used to filter out the voltage spikes)?