Positive Battery Terminal Melted- Causes and Easy Fix

Car owners always try to enjoy life with their vehicles and some may even forget to take the car for maintenance. That’s when issues like positive battery terminal melted complication comes in. There are several factors that can give rise to melted positive battery terminal problems. You need to understand that this terminal is a three-piece, meaning that it links several components like the starter and the alternator.

Therefore, sometimes it may melt, implying that there is a complication somewhere. If you want to know some of the causes of melted positive battery terminals, then I would encourage you to go through our research. Knowing the type of the disease is always advisable so that you can choose a suitable treatment.

Well, we have offered you a solution to each problem. The article will also provide you with reliable information like tips that you can put in place to better the situation. Besides, there is a section for frequently asked questions that I am sure will also provide answers to your doubts.

Causes of melted positive battery terminal

positive battery terminal melted

Let us start by identifying the ‘disease’ before suggesting a suitable ‘treatment’. The following culprits might be the one melting your positive car battery terminal;

1. Damaged cables

Cables may be damaged as a result of regular friction; daily wear and tear. The cables should be fitted in specific places so that it doesn’t come in contact with the car body. If the cable is left hanging, it is likely to become hanging, touching the car metal. The reaction and pressure will be exerted on the terminal even when the vehicle is not active.

Broken cables will always reduce the mass of the red copper wire, hindering smooth flow of electricity. Oxidation takes place when a certain part of the wire is naked, forcing it to react with water when the car is taken to a car wash. The positive terminal will be heated, becoming a mess.

2. Misaligned connection

This is the common problem that occurs mostly when you use your vehicle to jump-start a dead battery. Wrongly connecting the clamps will automatically make the positive terminal start overheating even before the jump-start is over. You are always supposed to connect specific jumper cables to the parallel ones on your battery.

Simply, the red positive cable has to be connected to the positive terminal while the negative one (black) to the negative terminal. Reversing the connectivity is dangerous and the common result will be to melt the cables and the terminals.

3. Low quality material

This is another factor that may melt the positive terminal of your car battery. The material used to manufacture items like cables are important not only for longevity, but also for sustainability. If it is for a case of jumper cables, most manufacturers are using Aluminum instead of copper. If the jumper cable is of low quality, it will fail to withstand excess current flow, burning the insulator and the terminal too.

You should therefore consider buying robust cables that can withstand hassles. Else, you as the car owner will be the one to suffer the most. The current flow will be interfered with and sometimes it might be over drained. Why don’t you consider buying excellent copper wires for your car battery?

4. Loose connection

Here is another common causative that we can hold responsible for melted positive car batteries. Loosely connected cable to the battery terminal will eventually result in overheating, melting the positive terminal. The reason behind this statement is that there might be excess power flow from the battery.

After a long period of usage, the nut holding the red terminal to the positive battery post can become loose. Now, whenever there is excess electricity flow, the cables will overheat, transmitting the problem to the terminal.

5. Corroded terminal

Corrosion is popular with battery terminals and the clamps and sometimes can occur in the insulation. With such a complication, the positive battery terminal won’t operate normally. Corrosion buildup will develop resistance that can force your battery to overheat as a result of straining.

The current flow in the cable will also be interfered with, hampering the speed too. Corrosion buildup can be realized after a certain period, this implies that paying attention to your car bonnet is always advisable. Your engine will also take a long time to crank as a result of corroded positive battery terminals.

6. Defective alternator

Though it’s rare, problematic alternators can also make your positive battery terminal melt. Poor aging will cost the entire function of this component, forcing it to exert excess electricity on the battery. The more than enough energy flow will overheat the battery terminal, burning the cables and even the terminal. With this complication, several starts will ruin everything since the motor will be spinning while trying to start the vehicle, but it won’t.

7. Broken starter

As one of the components of the red positive battery terminal, a small failure will melt the battery post. The terminal will get hot and eventually melt if this is the real culprit. Occasionally, your engine will not crank, but the battery terminal never ceases from getting hot. This is a common symptom.

Shorted or broken red wire to the starter can also give rise to this complication. Your vehicle will be draining energy from the battery without recharging it; not balancing.

How to fix positive battery terminal melted problem

How to fix positive battery terminal melted problem

You can use the following tricks to treat and curb the above complications;

Solution 1: Eliminating corrosion buildup

The first and simplest action that you can take to prevent your battery positive terminal from melting is cleanliness. Subject the terminal to a thorough cleanliness. For instance, you are allowed to use a reliable grinding paper or sandpaper to scrub to make the terminal brand new.

The entire three-piece accessory header should be cleaned for betterment. Besides, you should also ensure that the clamps or connectors in the components like megafuse, alternator and the starter are clean, free from any dirt. Remove any kind of dirt like grease, dust that can cause resistance.

Solution 2 : Opting for replacement

This is another simplest solution that you can offer to your car battery and its components. We have some items that might require substitutes for normalcy. For example, if the condition of the battery cable is not okay then you will have to go for a replacement.

On the other hand, the battery itself might be problematic. Why don’t you check its manufacture date? Or there could be some electrolyte leakage that requires a sealant. Though sealing might not help if the situation is worse, replacing the battery can work for such. Another component that may call for a replacement is the alternator and starter.

This solution becomes useful when either of the components have served you for several years. Their lifespans should tell you a lot.

Solution 3: Test the alternator

The best tool to be used here is the multimeter which is popular for testing continuity of a certain object. Therefore, you should consider carrying out the continuity test of your alternator to determine whether it is in good working condition or not.

If it’s dead, this could be the culprit and replacing it will be the best way to opt for. Failure to do so will melt the positive battery terminal.

Solution 4: Tighten the bolt

For loose connection, I would urge you to take two wrenches and make the bolt firm. It should securely hold the red positive cable to the battery terminal for consistent current flow. The red accessory should fit the terminal correctly and tightly. This action is advisable to prevent sparks that may melt the terminal. If this is the exact challenge you are facing, then it is high time you pay much attention.

Tips for betterment

  • Don’t waste your money on cheap car battery cables; the best material for manufacturing battery cables is copper. Copper remains incredible since it conducts electricity excellently.
  • Keeping water away from the cables can enhance the performance of the cables. Else, the effectiveness of these items will be limited.
  • For jumper cables, you should consider buying those that come with reliable storage bags to avoid daily wear and tear.


  • Can a hot battery burst?

Organic compounds can make the Lithium-ion battery to extend high voltages. This is a clear indication that the battery has the ability to keep more energy. Occasionally, the organic electrolytes may trigger a fire in case the battery is overheated. Hence, fire may be realized and worse explosions.

  • Is there a standard temperature for battery charging?

Of course yes, for example charging the battery below 40°F (4°C) may lead to chemical reactions inside its cells. This may end up causing non-repairable damage or fire explosion while charging.

Final words

Now that you have a clue on the causes of melted positive battery terminals, it’s high time you avoid them. If it happens, don’t hesitate to use the above solutions and eliminate the complication. The above information has it all; use it to solve the issue with your positive battery terminal melting complication.

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