I just purchased an OBDpeak A900 4k dashcam. I ordered a rear camera with it (1080P). The rear camera plugs into the main camera with a 3.5mm TRRS mini plug. The cable is about 5m long and at about 18" from the camera it has keyed 4 prong plug. Out of this plug is the a red reverse trigger wire. I plan to use the camera as an inside the cab camera so I need to shorten the cable to about a foot long. I plugged the rear camera into the main camera and it works fine without the trigger wire connected which is what I want. So I cut the plug from one end 6"" and cut the wire 6" short of the camera. Problem is now when I connect (solder ) wire together, no workie! The camera end has 3 wires red, green, white the plug end has 3 wires yellow, red, black + shielding + single fine bare wire. Got no idea what to connect to what. Tried mixing up the coloured wires without luck. Any help would be appreciated