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Mirror tap for radar detector

Hi All,

I recently installed a dashcam in our GV70 and tapped into the rear mirror power without problems. However, with the auto start-stop, it seems like power is lost for a moment when the car starts back up during auto start-stop. This causes the dashcam to restart, which it turn causes a short loss in recording time.

Is there anyway to keep the rearview mirror always on without this transition, or does it seem like something mechanical that can't be changed? Thanks
 
Hi All,

I recently installed a dashcam in our GV70 and tapped into the rear mirror power without problems. However, with the auto start-stop, it seems like power is lost for a moment when the car starts back up during auto start-stop. This causes the dashcam to restart, which it turn causes a short loss in recording time.

Is there anyway to keep the rearview mirror always on without this transition, or does it seem like something mechanical that can't be changed? Thanks
The problem is likely that the battery voltage falls while the starter is engaged. If your dash cam offers a backup supply, as many do, this would be the solution.
 
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Hi All,

I recently installed a dashcam in our GV70 and tapped into the rear mirror power without problems. However, with the auto start-stop, it seems like power is lost for a moment when the car starts back up during auto start-stop. This causes the dashcam to restart, which it turn causes a short loss in recording time.

Is there anyway to keep the rearview mirror always on without this transition, or does it seem like something mechanical that can't be changed? Thanks
As I recall there are a couple of power wires. Not all are tied to the accessory power.

I may be thinking of a different car though.
 
The problem is likely that the battery voltage falls while the starter is engaged. If your dash cam offers a backup supply, as many do, this would be the solution.
Thanks! That seems like the most likely scenario.

I check on the company website (Viofo), and it seems like they only suggest a rather large (and pricey) third party battery pack. Any suggestions on something that is small and may fit in the plastic mirror housing?

Thanks!
 
As I recall there are a couple of power wires. Not all are tied to the accessory power.

I may be thinking of a different car though.
Interesting, i used a harness that was specifically made for the Hyundai/ Genesis cars which didn't require me to tap into a specific wire in the mirror, it was essentially plug and play. Now i am wondering if something can be changed at the fuse box to prevent this mirror from falling below a certian voltage during the auto start-stop sequence
 
Thanks! That seems like the most likely scenario.

I check on the company website (Viofo), and it seems like they only suggest a rather large (and pricey) third party battery pack. Any suggestions on something that is small and may fit in the plastic mirror housing?

Thanks!
I doubt that any will be small enough to fit there. Most likely you will have to route wiring over the headliner and down an A pillar to have the device hidden somewhere under the dash.

Interesting, i used a harness that was specifically made for the Hyundai/ Genesis cars which didn't require me to tap into a specific wire in the mirror, it was essentially plug and play. Now i am wondering if something can be changed at the fuse box to prevent this mirror from falling below a certian voltage during the auto start-stop sequence
You need to use a voltmeter (either an analog one, or a fast digital one) to measure the voltage at the camera during engine start. If it actually goes to zero, then picking another power source (pin) might well work for you. Instead, if it just drops lower, say to 11V or 9V, then the backup power bank is still what you need.
 
I doubt that any will be small enough to fit there. Most likely you will have to route wiring over the headliner and down an A pillar to have the device hidden somewhere under the dash.


You need to use a voltmeter (either an analog one, or a fast digital one) to measure the voltage at the camera during engine start. If it actually goes to zero, then picking another power source (pin) might well work for you. Instead, if it just drops lower, say to 11V or 9V, then the backup power bank is still what you need.

Thanks and great suggestion! I'll grab a digital multimeter and see what is going on with the voltage. I'll report back once i find something! :)
 
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