Car battery

Solved: Why Your Car Won’t Start Unless You Disconnect the Battery

Written by Autofot
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Car troubles are frustrating. They happen to everyone from time to time. But sometimes, they just never go away. When your car won’t start, you may feel helpless. But with a few simple tricks, you can get back on the road quickly. In this article, you will learn how to diagnose common car problems relating to battery and fix them yourself. You’ll learn how to test your alternator, starter motor, fuel pump, ignition system, and more. And once you’ve diagnosed the problem, you’ll find out how to repair each component yourself. This will help you save hundreds of dollars on expensive repairs and prevent future issues.

What causes a car to stop starting without warning?

Here are some possible causes:

 Faulty Ignition Switch

An electrical short circuit inside the ignition switch may cause the engine to fail to start. If you notice any unusual sounds or smells, immediately remove the spark plugs and inspect the area under the hood.

 Engine Malfunction

Engine malfunction is another common cause of engine failure. Check the engine block for signs of overheating. If you find anything abnormal, contact a mechanic immediately.

 Battery Failure

Batteries play a vital role in keeping vehicles running. They provide power to the starter motor and other components of the vehicle. Batteries are usually located near the engine compartment.

Check the condition of the battery terminals and connections. Replace batteries if necessary.

 Fuel System Problems

Fuel system problems include fuel line leaks, faulty valves, clogged filters, and bad gas tanks. These conditions should be checked by a professional technician.

 Electrical Issues

Electrical issues include loose wires, corroded connectors, damaged fuses, and worn wiring harnesses. Contact a qualified electrician if you suspect these types of problems.

 Mechanical Issues

Mechanical issues include broken belts, seized engines, blown head gaskets, and cracked blocks. All mechanical problems should be repaired by a certified mechanic.

 Other Causes

Other causes of engine failure include air intake restrictions, blocked exhaust pipes, and defective carburetor jets. Consult a mechanic if you suspect any of these problems.

How to solve the problem of Car not starting unless you disconnect battery 

Preventing future engine failures depends on preventing similar problems from occurring in the first place. Here are some tips to prevent such problems from happening again:

• Always replace old batteries with new ones. Old batteries can leak acid and pose a fire hazard. Along this you have to inspect your battery cables regularly. Make sure they are securely connected to the battery posts.

  • Perform regular maintenance checks.
  • Do not leave keys in the ignition as this can drastically get your battery drained.
  • Be careful when refueling, impurities can cause a lot of damage to your car that may cause it to jerk and refuse to start.
  • Disconnect Battery

Disconnect the battery first. Then connect the positive terminal of the battery to the negative terminal of the starter motor. Connect the ground wire to the chassis.

  • Test Starter Motor
  • Check Voltage Regulator
  • Check Fuses
  • Check Battery Terminal Post
  • Check Battery Cable
  • Check Battery Capacitor
  • Check Battery Charging Circuit


In conclusion, if you have a car that doesn’t start when you turn the ignition key, check the fuses first. They may have blown due to corrosion from sitting too long without being used. Next, check the connections between the battery terminals and the starter motor. Make sure that none of the wires are loose or disconnected. Finally, look under the hood for any signs of damage.


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About the author


Autofot is a website that blogs on the importance of taking good care of our automobiles. Little things that are ignored matter the most, hence we try to educate car owners and other different auto owners on how to go about taking care of their cars with little or no cost.

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