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Battery dying

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New User

Sep 27, 2017, 1:02 PM

Post #1 of 2 (667 views)
Battery dying Sign In

Hello, I am hoping to get some help with a problem that I have been having with my 2007 Hyundai Elantra. About 6 weeks ago the car would not start, but started right up after it was jumped. My mechanic took a look at it and replaced one of the wires running to the battery. There were no problems for about 2 weeks, then the same thing happened again. Mechanic replaced the other wire running to the battery. Another 2 weeks passed and he replaced the battery. Now about 3 weeks later the same thing has happened. Each time this has happened it starts right away after bring jumped, however once it is shut off it will not restart even if it has been driven for 20 minutes or so. The mechanic has checked the alternator and starter and says that they are working fine. All of the fuses are fine as well. Any ideas on what could be causing the battery to die pretty much every 2 weeks? Do you think there could be come kind of electrical short that is slowly draining the battery and causing it? I would greatly appreciate any ideas any one has. Thank you.

Hammer Time
Ultimate Carjunky / Moderator
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Sep 27, 2017, 1:19 PM

Post #2 of 2 (663 views)
Re: Battery dying Sign In

You should use that term "mechanic" very lightly when referring to this guy. It sounds like he is testing nothing before making repairs.

It sounds like it needs to be tested for a parasitic draw on the battery.

This is how it is done.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 30 to 40 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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