Jumper cables crossed.The car wouldn't start. Found it wa...

Q: Jumper cables crossed.The car wouldn't start. Found it was a fuse that blew which we replaced. The car turned on but then we had t

asked by on June 07, 2017

Crossed the jumper cables. Car wouldn't start after that. Figured out it was a fuse that blew which we replaced. Then we replaced the alternator.The car was working fine. But then the battery started dying again after a couple of days. So we have to carry w/ a portable battery charger because we don't know when the car is not going to start. What can it be that is sucking up the battery. Please help

My car has 90000 miles.
My car has an automatic transmission.

If you are very lucky, you may just need a battery. When you cross the jumper cables, you can do a lot of damage in the blink of an eye. If it just trashes the alternator and the battery, you have beaten the odds. You could try disconnecting the battery to see if it still goes dead. If it does, you may just need a battery. If it doesn’t go dead when disconnected, then you have a draw in the system. In your case, you might have damaged one or more diodes in one of the many control units that inhabit your car. Testing for an off key draw is time consuming and requires a pretty thorough knowledge of the car’s systems. You can have this thing checked out by a pro by contacting Your Mechanic. They can send a technician to your home or office to check out your battery drain and advise you as to the next step.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

car cranks but won’t start code is P0339. Already replaced the crank shaft sensor but still won’t start. It does randomly start up

A common reason for the P0339 code is damage to the crankshaft position sensor wiring harness due to exposure to engine oil. The wire harness and all terminals should be carefully inspected. Also, the reluctor ring should be inspected for...

Green fluid leaking in the rear of car

You have a leaking rear a/c heater system core or hose for the rear unit. You will need to keep the rear heater turned off and keep coolant in the engine full to prevent overheating the engine. Have the cooling...

Remote power lock malfunction

It's not a good idea to remove fuses in an attempt to disable the power door locks; as this will also impact other vital vehicle operations. It's more likely that you've got a problem with the power door lock actuator....

Related articles

Signs Your Car Has a Blown Fuse
If you own your car long enough, you can assume that at some point, one or more of your...
How to Make Car Switches Last Longer
Every Every feature in your car is controlled by a switch or button. Most are actively controlled, such as the power windows and power door locks, by means of pressing a button. Systems that are actively controlled include: The...
How to Tell If Your Car Switches Are Dying
Since Since every part of your car is controlled or operated by a switch in some fashion, it is to be expected that the switch will eventually fail. Some of the most commonly used switches in your car are: ...