I did some tests. I need help interpreting the results.
measuring equipment: Fluke 287 history graph feature.
Theory: 90W PC power supply isn't good enough because it can't supply enough current when needed
Test: use car battery
Result: same video flickering problem
Theory: a drop in voltage when a load is applied is what causes the camera to flicker
Test: apply 4700uF 35v cap to circuit (which will also cause the video to flicker) and read voltage data from DMM.
Result: voltage only momentarily dropped from 12.1v to 11.8v
Conclusion: voltage drop is not significant enough be the cause of the problem.
what else should I test?