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Backup Camera Video Ground Interference, 2017 Jeep Wrangler


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kjabs 
Member - Posts: 3
Member spacespace
Joined: June 14, 2022
Location: Arizona, United States
Posted: July 03, 2022 at 4:11 PM / IP Logged Link to Post Post Reply Quote kjabs
I'm trying to install a backup and forward camera system in my 2017 Jeep Wrangler. Here's my situation.
I'm getting crazy ground interference on the RCA lines. The kit is a backup camera and a forward-facing camera, with a switcher module and harness, that connects to the factory screen. Both cameras are sharing the exact same power point, so it's not 12v related. I also tried a low voltage 12v in-line power ground isolator, and that didn't help.
The forward camera is what's causing the issues. But, it's causing issues on the REAR camera! So, it's hopping between inputs. When the front camera is plugged in, but I'm displaying the rear input, the rear camera loses color, or sometimes gets vertical rainbow banding scrolling from left to right. When no front camera is plugged in, there's no interference whatsoever.
If I touch and hold the front camera exposed RCA shield with two fingers, it fixes the issue. I'm not sure if I'm squeezing to create more pressure and that's what's fixing it, or my capactive touch is having some effect like a phone touch screen? I've tried like 6 other cameras (ordered online to return) and they all have the same issue, so I know it's not the camera.
The strange thing is, if I switch the front camera to the rear input, and the backup camera to the front input, I don't have any issues.
I've gotten a new module from the company, and it's having the same issue. I'm wondering if the module is just poorly designed? If it is, they won't admit to it, though.
I finally got some BNC CCTV ground isolators (https://www.amazon.com/dp/B00MFRVJSI) and BNC/RCA converters, and they do seem to help. The rear picture still gets a little interference, but never loses color, with these installed. But, I don't want to have to use these, because based on reviews, they seem to burn out. Also, the damn thing should just work like it's supposed to!
Any suggestions?
Thanks in advance!
audiokid1 
Copper - Posts: 115
Copper spacespace
Joined: March 17, 2003
Location: Indiana, United States
Posted: July 10, 2022 at 10:16 AM / IP Logged Link to Post Post Reply Quote audiokid1
Reverse trigger on the Jeep is more than likely PWM and that is what is causing your issue.
You may tie into the trailer tow harness for reverse, or use a filter like the CA-FLTR from Echomaster.
kjabs 
Member - Posts: 3
Member spacespace
Joined: June 14, 2022
Location: Arizona, United States
Posted: July 30, 2022 at 9:29 PM / IP Logged Link to Post Post Reply Quote kjabs
It's triggered by the CANBUS sensing reverse gear; I tapped into keyed power, not the reverse light, so the camera is on with the car and the head unit is programmed by the module.
There's no interference unless the front camera is connected and grounded. The camera control module has shared ground for both RCAs and I think that's causing the problem.
I tried a third-party 12v screen meant for DVD players and there was no issue.
I tried a similar power filter to what you listed, and if it is actually the same, it didn't help.

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