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The biggest reason a battery terminate or connection would get hot is the connection is lose. That along with the high amount of power it is using to try and start will make it get very hot. The terminals on a lead acid battery can even melt from the heat. A hot cable and battery can cause injury.
Just so, is it normal for battery terminals to get hot? here
Why does a battery get hot?
Now touch the red meter lead to the negative battery cable itself. again you should see 0.0 volts. If it's higher than the last step, the cable to terminal crimp is lousy. here
Have a helper hold the meter's black (-) lead to the TOP of the battery post - not to the wire or wire terminal. go right to the battery after you sand/scrape a little clean spot in it.
Got a decent voltmeter - a digital one? If so, try this:
Touch the red (+) meter lead to the outside of the wire terminal. In theory you'll see 0.0 volts. but if you see a few tenths you've confirmed a lousy connection.
Now touch the red meter lead to a good chassis ground point. you'll probably see about 0.2 volts now; if you get more than that then the negative cable to chassis connection (below the battery) is crappy. more
Negative car battery cables are fairly inexpensive to replace because there really isn’t much to them. They are really just a thick metal cable surrounded by plastic or rubber to insulate them with a battery terminal on the end. You can usually find a replacement negative battery cable in the $20-$30 range. [links]
Another symptom of a bad negative battery cable is dim or flickering headlights. Your headlights need a proper connection to the car battery to be able to provide enough electricity to the headlights to illuminate the road in front of your car. more
If you see corrosion on your battery terminals you would want to clean off the corrosion by pouring cola on it. Alternatively, you could also make a paste out of baking soda and water to use to clean your car battery terminals with an old toothbrush or a rag. The video below shows how to use baking soda to clean your battery terminals. [links]
A bad battery cable typically won’t drain a battery but it can prevent it from charging. The electrical system of your car needs a good ground connection to be able to allow your car to start up and to allow the alternator in your car to produce electricity.
Another sign that your negative battery cable is bad and needs to be replaced is a frayed or damaged battery cable. Inspect your battery cables for damage, they should be smooth and not have any nicks or corrosion on them. more
Your car’s battery should be above 12.6 volts when your car is off and should be between 13.7 to 14.7 volts while your car is running. If your voltage reading is different than what I described above you could have a problem with your positive battery cable, your battery, or your alternator. more