Hot battery cable

Hi and thanks for using 2CarPros.com.

That is a tough question. To an extent, it is normal for an alternator to get somewhat hot, but the negative cable should not. Often times a weak or lose electrical connection will cause power to arc and create heat.

What I suggest you do first it this. Make sure the negative cable is in good condition, tight, corrosion free, and has a good ground at the engine block.

If everything is in good condition, tight and clean, then we need to check the alternator to make sure it is not producing too much power as a result of a bad voltage regulator. Follow the following link for directions.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know what you find. However, heat usually is the result of a bad connection or corrosion causing high resistance in the wire itself. Again, make sure connections are good and the cable itself is good. By the way, what prompted you to check the cable and alternator? Was it a smell, something not working ?

I will watch for your reply.

Take care,
Joe