Munchnd

So I have an 07' CR-V and had it wired for a trailer. I used it once and never did again until recently. I got a boat and trailer and started pulling it around with my CR-V. Originally, everything worked fine but eventually, things started to get worse. As I would push on the break, it would cause all the displays in my vehicle to dim, this later started making my DII(Driver Information Interface) go haywire anytime I would push on the breaks. Now, even without the trailer connected and wired, the DII is permanently messed up. Thanks for any help!