What happens if you hook up a battery backwards on a car?
When a car battery is connected backward, a fuse designed to protect vehicle electronics should blow. If your vehicle doesn’t have a fuse (almost all cars do) designed for this purpose, you will send electrical current backward through systems in your car, including ECU, transmission control unit, and more.
Why does a car battery come back to life after an hour?
In some cases you can crank the engine until the battery seems totally dead, then come back an hour later and crank it again. The higher the drain on the battery (a car’s starter motor is an incredibly high-drain device!), the greater the effect. To understand why this happens, it is helpful to understand what’s going on inside the battery.
What kind of Charger do I need to recharge my battery?
A rechargeable battery can be recharged using a battery charger. Be sure to buy the correct charger with terminals that are sized for the right battery size, from AAA to D. Which is better: NiMH or lithium ion? Lithium ion provides a higher voltage output and a single cell can deliver 3.7 volts while two NiMH cells only produce 2.4 volts.
What to do if your car wont crank or start?
Did you check the “crank” fuse #5 in the under hood fuse block and if okay, try swapping in a horn relay or similar non important relay for the “crank” relay #34, also in that under hood fuse block? helpful? Please login or register to post a reply.
Why does my car not start without a battery charger?
Without the battery charger hooked up, using just the key cranking the starter or at least trying to crank the starter does either battery cable smoke or get too hot to the touch? helpful? helpful?
What should the battery voltage be to crank the engine?
Once your battery is at 12.6 volts, there will be no problem cranking the engine if the cables and connections are in good shape. When the engine is running, measure the battery’s voltage again.
What is the meaning of the sentence my car will not crank over?
Your first two sentences suggest the battery was run down, most likely from a system draw. A different battery will solve that until it runs down too. In your third sentence, unless the new battery was also discharged, you likely have a loose or dirty battery cable connection.
Why is my car not cranking over when I replace the battery?
That used to be commonly caused by a failing neutral safety switch, but today that is much more likely to be caused by a computer. It is standard practice now to use some type of memory saver device when replacing the battery so all the dozens of computers retain their memories.
What happens to the battery when you start the car?
Once the car is running, the alternator sends current back to recharge the battery as you drive. It supplies power for your car’s electronics when you’re underway and makes sure the right amount of charge goes back to the battery. The common signs above should help pinpoint what exactly is going wrong.