VIOFO HK3 Acc Hardwire Kit for A129, A129 Plus, A129 PRO, A129 IR, A119V3, Enables Parking Mode, Low Voltage Protection

I decided not to use this as it has a HUGE choke on the end near the plug. So, it can't be tucked neatly under the headliner. Very poor design.

This is a must for parking to make double dog sure no one messes with your stuff. I put it in a 1957 truck and it's great. I have a video on YT: bobeaseshop

Works like it should. Arrived before the dash cam.

As you’d expect, this cable is exactly what you need if you want a clean installation of your Viofo dash cam while also enabling parking mode so you can capture anything shenanigans that happen while you’re away from your vehicle.In the middle of the cable is a small control box that handles the discharge protection so you don’t return to your car only to find that your dash cam drained your battery. Using the physical switch you can select from 4 different cutoff voltages. Once your battery reaches that voltage the box will cut power to the dash cam to prevent any further drain on your battery.One side of the control box has a black jacketed mini-USB cable which you’ll want to run up the A-pillar of your car, across the top windshield trim, and into wherever you’ve mounted your camera. There is a little bit of a design issue with this cable as it has a ferrite ring molded into it a few inches from the mini-USB connector. This is annoying because it’s unlikely you’ll be able to easily fit the ferrite ring under the top windshield trim like you can with the rest of the cable. In my case I was able to tuck the ring into the central dome light/rearview mirror trim panel and then simply run the cable from there along the edge of the windshield trim. It would be nice if it was just a plain cable without the ferrite ring, but I guess Viofo determined there was some interference risk and added it.The other side of the control box has the 3 cables that you’ll need to connect coming out of it. One for constant power, one for switched/accessory power, and one for ground. The ground wire already has a half ring terminal crimped onto it so you likely will be able to simply loosen a body bolt, slide the terminal under it, and retighten the bolt to establish your ground connection. In my case there was a bolt securing the fuse box to the vehicle that worked perfect for ground.For a clean installation I recommend picking up 2 add a circuit fuse taps with this item. You can then attach the add a circuit modules to the wires and plug them directly into your vehicle’s fuse box.

This is a great three wire hardwiring kit and is the third of three that I’ve installed.The first was the Plozoe which was a two wire power supply. If only one power and a ground are needed it’s a great product with the best value as it includes 4 sizes of fuse taps that by themselves usually cost $7 a piece. It doesn’t have an selectable battery low charge feature.The second was the Power Magic Pro: what a piece of over-priced garbage. First off, it didn’t work out of the box which many have reported. You’re forced to retain the cigarette-like plug to adapt it to the dash cam, which makes it the most antiquated and inflexible of the hardwire kits. Warranty is voided if you remove the plug for more streamlined, less bulky terminals. The fork terminal for the ground is tiny; most grounding points that you’ll find will be M6 (10mm socket) or 1/4” bolts, so you either not find a suitable connection or have to source a larger M6 terminal to replace it with.The Viofo three wire affords you a battery power wire for parking mode and an ACC wire to wake up the camera when you start the car. The circuit board allows for multiple battery low charge protection limits and has nonproprietary USB connections. Hopefully this will become the new standard for dash cam hardwire kits. You must source your own fuse taps or splice into the vehicle power supplies which most pros suggest.The Viofo A129 Pro Duo with this power supply has been the best combo for the price, ease of use and performance. The small screen makes setup and monitoring current operation convenient and takes up a very small piece of windshield real estate.The Vantrue failed mostly because it would never wake up from parking mode (a three wire system would alleviate this problem).The Black Vue is very cheaply made for the cost. It has some nice features that make it an enticing option, but it’s in need of some serious updates and material upgrades to justify cost. The camera plastic is very cheap and the front camera jiggles around in the base. It also lacks a screen interface to quickly assess mode and operation. Save your money.

Straightforward kit

Both times I have purchased these (for two different cameras) they haven't worked. One completely stopped working after a few days and the other made the camera do weird things when the car turned off. I would come out to the car the next day and the camera would be constantly beeping and lights flashing, even though it was not doing that for the first hour the vehicle was turned off. I took it out after reading a review here that said this hardwire kit broke someone's camera altogether.Honestly the worst part about it is the time you have to invest researching the fuse tap, the fuse you need to use, then hiding the wires only to find out it doesn't work. Then you have to pull it all out and go back to using the 12v plug that came with the camera. I would be super angry if I had to pay someone to install it over and over again because it kept breaking.The A129 Pro Duo has been a great camera for several years for me. I do not understand how this company can make something so good and yet cannot get their simple hardwire kit to work.Customers have been complaining about this hardwire kit for years. Change your design or change production facilities! You obviously have massive quality control issues for this product, Viofo. You are losing customers, including myself. I want a dash cam that can be hardwired to my vehicle so it can run while I'm away, RELIABLY.That's why I won't buy another Viofo when it's time to upgrade. My next camera will be Thinkware.