Here's a weird puzzle for car DIY. I fitted a front dash cam to my Wife's car (ka+) and my kit car, and both dash cams have been working ok for over a year. On both cars I hard-wired the supply via an aftermarket transformer powered from an ignition activated fuse on the fusebox. The one in the Ka+ started giving problems a couple of weeks ago - it kept turning off and on, and it seemed as though it wasn't getting the electrical feed via the mini USB connector. It will only continue a few seconds using its internal battery, hence the turning on and off, although it has enough juice (if left unused for a long period) to retain the date and time settings. I unplugged the dash cam in the ka+ and replaced it with the one from my kit car, but the problem was still there, so I switched them back again. If using a 'plug in the accessory 12v' feed to the mini usb, the dashcam works as expected. So, we have a short-term fix. I checked the feed from the fuse box with a multi-meter, and it's correct, so my initial though was the transformer (12V to 5V had fried itself).
Now here's the real puzzler...........
Last week the dash cam in the kit car stopped working! I haven't had a chance to check the supply with the meter, but since I previously used the car (the dash cam was working ok at the time) I'd removed the battery and put it on smart-charge in the garage. Similar problem, and again if It's powered from the accessory plug it works ok. The only (weird and obscure) reason I can think is if both transformers have failed due to high ambient temperature within the cars during the recent heatwave. Anyone got any other ideas? ETA I'll get the multi-meter on the fuse box of the kit car to ensure there is a feed when I'm next able to stop fixing the Wife's car problems.