11/03/2021
My engineering / problem solving clients will appreciate the following:
My wife Angela's car recently failed to start one morning due to a dead battery. I jumped it, checks for dome or headlights left on, and finding none gave her the jumper battery pack to carry if there were any future problems. After work, she had to jump it again.
When she got home, I verified the battery was good (no dead cells, held a charge) and figured it must have been a corroded or bad connector. I put it a charger on the battery overnight to top off the charge.
Car started the next morning, but required a jump after work to return home. What drained the battery by sitting in the school's parking lot all day? I figured it had to be a dome light, dash cam, etc. draining the battery. But I hadn't installed anything recently, so what had changed?
A couple of months back, I got a couple of USB cords for the girls to charge their phones in the front and/or back seats. So they can also charge their ear-pods, and backup batteries, I got the USB cords with the magnetic ends swappable to connect iPhone, micro-USB, or USB-C.
Issue turned out to be a Canadian dime that made it's way into the car, and was dropped onto the floor. When the cord was once left bare without a magnetic end, it attached itself to the magnetic coin, shorting out and draining the battery. Luckily, it would get hot, but not hot enough to start a fire.
Those cords have been replaced with the octopus cords that branch into 4 different ends for multiple devices. Now, it's just a matter of time before someone ignores my warning, plugs in multiple devices at once. I suspect it will result in a blown fuse.