There have been a few threads here about how newer cars don’t fully charge the battery while driving. During normal driving ours switches back and forth between charging and letting the battery power everything. Most of the time, after the journey (long or short) and the car is parked, the voltage is 12.2v or lower (i.e. 50-60% charged). We’ve had the Crosstrek over a year now and it has always had enough power to start but I don’t think the normal resting voltage has ever been over 12.2v.
Besides being bad for the long term life of the battery, I’ve just discovered a new problem with this charging philosophy. How to power a dash cam in parking mode?
I just installed a new dash cam and the power monitor had a default minimum voltage of 12.5v, so it wouldn’t work. The only other setting is 12.0v and that worked for a while but the voltage dropped to 11.9v overnight.
So, my question is, how can I modify the battery charging so that it always charges the battery while the car is being driven, without overcharging/overheating it?
18 DGM Ltd, volba #3 & #23
3644 příspěvků · Připojeno 2017
You can’t. Keep your battery charged by driving regularly and on longer trips, or top it off with a charger from time to time. I have had to do that once already with my Crosstrek.
Not sure why you want to keep your dash cam running while you are parked (overnight?). But it shouldn’t take that much power, I would think. And not sure why it has to cut out at 12.5V (90% charge, 12.7 is 100%)). Maybe you can change that on your camera. Or start looking for another camera.
225/65R17 BFG K02s on OEM 17″ wheels, no lift, no rubbing
AstroKats Discussion starter
21256 příspěvků · Připojeno 2017
Why not? Maybe it would require too many hardware and software changes to be worthwhile but I don’t accept, «You can’t» as an answer. Until recently, my cars’ alternators would power the electrical system and charge the battery all the time I was driving.
>Keep your battery charged by driving regularly and on longer trips, or top it off with a charger from time to time. I have had to do that once already with my Crosstrek.
I don’t want to have to top up the battery when it should be being charged while we’re driving it, and it’s not. I’ve ran tests, and posted the results here, that show that the battery is often not being charged while driving.
>Not sure why you want to keep your dash cam running while you are parked (overnight?).
Are you serious? The point of a parking mode cam is to have some evidence (for insurance, the police, etc.) if something happens to your car while it’s parked.
>But it shouldn’t take that much power, I would think. And not sure why it has to cut out at 12.5V (90% charge, 12.7 is 100%)). Maybe you can change that on your camera. Or start looking for another camera.
If you had read my post you would know that the default minimum voltage on the power saver, supplied with the camera, is 12.5v and I changed it to 12.0v. But that’s not the point of this thread. I’m looking for useful suggestions how to get the Crosstrek to charge the battery while it’s being driven.
18 DGM Ltd, volba #3 & #23
3644 příspěvků · Připojeno 2017
Well, it is your car, time and money. And just so you know car batteries not staying fully charged is a pretty old problem. My 2004 Avalanche was not driven frequently, and I had to charge it every 3 months or so in the winter. And it had a giant alternator and battery. Needed that for its 8.1L engine.
Hodně štěstí při hledání.
225/65R17 BFG K02s on OEM 17″ wheels, no lift, no rubbing
3644 příspěvků · Připojeno 2017
Also, curious why do you need to provide evidence to the police or your insurance if you have a break-in?
And just how many times with all your past cars, have you had situations where a dash-cam capture vid would have saved you money?
225/65R17 BFG K02s on OEM 17″ wheels, no lift, no rubbing
AstroKats Discussion starter
21256 příspěvků · Připojeno 2017
This is your second post, after you wrote, «Good luck with your quest. «
Why does it bother you so much when I challenge your opinions?
Lots of people I know like the idea that a dash cam can provide evidence. If someone damages our car while it’s parked, maybe the dash cam will find out who it is and then their insurance company will have to pay for it, not ours (and they may get charged with a hit and run). Just a few days ago I was in a supermarket parking lot and a lady was upset because someone had scraped her car while she was shopping.
The extra money for a dash cam with a parking mode is peanuts compared to several years of insurance premiums.
Again, not sure why you’re trying to tell me I’m wrong here, in a thread I started, asking how to keep the Crosstrek’s battery charged fully.
18 DGM Ltd, volba #3 & #23
3644 příspěvků · Připojeno 2017
Just trying to save you some time and money.
Just thinking about your dash cam kicking out at 12.5 or 12V. On 2nd thought, that is actually a good feature to prevent you from running down a battery when parked.
225/65R17 BFG K02s on OEM 17″ wheels, no lift, no rubbing
AstroKats Discussion starter
21256 příspěvků · Připojeno 2017
Exactly, that’s why I bought the power saver/monitor with it.
18 DGM Ltd, volba #3 & #23
8587 příspěvků · Připojeno 2013
Before the discussion gets too animated (and for once it’s not about OIL!!), everyone is right to a certain extent! What we have here is really a failure to communicate!
R P is right that cars have never been able to FULLY charge a car battery, as I’ve explained in previous threads, due to cost, the time needed, and generally a reason to. With the eco-charging system, as AstroKats pointed out (and I believe I have a thread on that somewhere as well), the existing system leaves a lot of charging that isn’t done (ie the battery stays in the 50 to 60% region for SOC) especially when compared to older cars without an eco-charging system.
So, is there a way to defeat the eco-charging system? And what would you know, I have a thread on that as well. it seems WRX owners experienced the issue first as the low voltage would shut down their Cobb devices during drives. One WRX owner found out that by removing ONE wire from the engine fuse box, you can defeat the eco-charging system and the battery would charge all of the time just like previous generations of cars! Another method is installing a specialized fuse which supposedly addresses the issue as well.
Will that FULLY charge a car battery? NO! However, it’s a whole lot better than 50 to 60%!
Here’s that thread — https://www.subaruxvforum.com/forum. harging-leading-poorly-charged-batteries.html. In that thread is a link to another forum’s thread on the subject as well as a link to a Youtube video on it. As far as I know, no one has done either on a Crosstrek so it would be interesting to see what happens.
Sportovní výbava 2013 XV (Kanada) — Deep Cherry — CVT
AstroKats Discussion starter
21256 příspěvků · Připojeno 2017
Before the discussion gets too animated (and for once it’s not about OIL!!), everyone is right to a certain extent! What we have here is really a failure to communicate!
R P is right that cars have never been able to FULLY charge a car battery, as I’ve explained in previous threads, due to cost, the time needed, and generally a reason to. With the eco-charging system, as AstroKats pointed out (and I believe I have a thread on that somewhere as well), the existing system leaves a lot of charging that isn’t done (ie the battery stays in the 50 to 60% region for SOC) especially when compared to older cars without an eco-charging system.
So, is there a way to defeat the eco-charging system? And what would you know, I have a thread on that as well. it seems WRX owners experienced the issue first as the low voltage would shut down their Cobb devices during drives. One WRX owner found out that by removing ONE wire from the engine fuse box, you can defeat the eco-charging system and the battery would charge all of the time just like previous generations of cars! Another method is installing a specialized fuse which supposedly addresses the issue as well.
Will that FULLY charge a car battery? NO! However, it’s a whole lot better than 50 to 60%!
Here’s that thread — https://www.subaruxvforum.com/forum. harging-leading-poorly-charged-batteries.html. In that thread is a link to another forum’s thread on the subject as well as a link to a Youtube video on it. As far as I know, no one has done either on a Crosstrek so it would be interesting to see what happens.
Thanks rlouie, I had remembered that thread (I even posted in it, almost a year ago, LOL) but either forgot or never read the part about the charging mod. That’s exactly what I was looking for and seems super easy and no cost.
I shouldn’t have referred to «fully charged» — what I really meant was more fully charged than it is now. Since I got a USB cig port adaptor with a voltage readout I’ve noticed the voltage drop, sometimes quite significantly, for extended periods while driving around town. So if this mod really does mean that the alternator is always putting out over 14v then hopefully it will solve the problem with the parking mode for the dash cam, and may even extend the life of the battery, as I know it’s not good to leave lead acid batteries at a low charge for long periods.
OAK has the car now so I can’t check if the fusebox wire is exactly the same as in the video but I’ll try it over the weekend and report back. If anyone has a service manual and can confirm, that would be great.
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