Is that what's happening?
just one is ground, one is 12v+ that powers the camera, one is the power for the 4amp load, one is +video, and the other four are going to two bi-directional motors which, by the way, have no effect at all on the video when used.
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)?