New System IR Outdoor Bullets, Several Not Working

I just walked into this so give me a lttle break. The box says Mega IR bullet camera. Big help right?

Eight cheap Korean? HD cameras, no internal menu to look at, 12 VDC with (Minimal) tolerance. Only two are showing video at the DVR. Altronix multicamera power supply two terminals not used. The installers tried inline CCTV boosters and found 60 foot of cable they could trim from the final distance. Still only two cameras up.

Starting the diagnosis, and not having a portable monitor on this trip, I wiggled the BNC's on the DVR, one camera flickerd to life but was black and white. I replaced the BNC and have an active camera. After about 15 minutes this camera started turning on and off. in a regular timed interval of about 3 seconds. I opened the Altronix and checked voltages to all cameras. 12.4 to 12.6. I found the pot on the power supply board and tweaked it up a bit which stopped the on/off. Tweaked a bit more and another camera came up but it too is black and white. ??? I tweak the voltage up to 13.4 and both cameras go pink. Ooops! Shut off power and wait 2 minutes. Turn down power to where the pot was and have four cameras, two in color and two B&W. My time was limited that day so I had to leave.

The next trip I'll have a portable monitor and a lab rated variable DC power supply so I can power each camera individually to see if it's an amperage issue.

Anyone think of anything else?

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