I am installing a backup camera in my truck. I am getting some source of electrical "noise" in the electrical system in my truck and its not allowing the backup camera to operate. Let me explain a little further. (thanks for your patience)
- Installed the head unit and backup camera in the truck, Head unit is pretty standard, it has a 12 volt (+) input to trigger the head unit to "see" that the truck is in reverse.
- the camera is connected to the head unit via an RCA cable with an additional (+) and (-) line included.
- at the camera end of the RCA line there is (+) and (-) tag ends hanging out that you are to connect to the reverse light harness on the truck.
Basically when you put the truck in reverse, the power is also tapped to the camera, when the camera is powered it sends a (+) signal to the head unit and it flips the screen over to the reverse camera automatically.
When the truck is off but key in the on position and I put the truck in reverse the camera works not a problem. When I start the truck and put in reverse the screen simply goes to the yellow ! on the screen. According to the manual they are saying its because there is interference with another signal. Im assuming at this point its with the alternator or something with the engine running.
In the installation manual they have a pic of a filtering circuit.
I believe that in the diagram has the polarity on the capacitor is incorrect? Should not the negative lead of the capacitor be on the negative lead of the 12 volt circuit?
In my local electronics store I could only get a 3300 uf cap but I believe this should be ok in this instance.
also to verify please the band on the diode should be toward the backup camera correct?