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votes
2answers
1k views

My 2010 Hyundai Elantra won't start without a jump

My car won't start without a jump. I’d jump it with cables, it will start with no problem, but as soon as I turn it off, I won't turn over.
1
vote
0answers
107 views

Filled a battery with distilled water and trickle charged for days

The starting voltage was 10.5 volts and when I left it charge at a 2Amp current it took a day to get to 11 volts and another day to get to 11.5 volts and would not go any higher. I took it off charge ...
1
vote
0answers
31 views

headlights not working but they do if jumping battery

im guessing the solution is to replace the battery but i dont want to spend $100+ on a battery if that is not the fix. here is the scenario: headlights stopped working so i bought some fuses and ...
1
vote
1answer
2k views

Delco battery code

I have two new Delco batteries and the code reading methods I have seen don't seem to work. there is an etched number in the top 7MKD27, then there is a sticker P0585 with group number on the ...
4
votes
0answers
118 views

Can an 18V-5W Solar Panel Provide an Equalizing Charge for a Battery?

I recently finished a project in which I installed an additional cigarette lighter port on my car that was always on (the existing one was only on when engine was running), and connected a small solar ...
4
votes
1answer
76 views

When can desulfation extend the life of a battery?

So I was reading up about battery desulfation, and it seems like a promising way to rejuvenate lead-acid batteries. Questions Can this work on a severely discharged battery, e.g. less than 9 V for a ...
6
votes
3answers
110 views

Multiple Batteries Charging

I have multiple batteries off from motorcycles, and each of them has it's own charge level (12-13 Volt measured at rest). Assuming I have only one 12 Volt charger, can I charge them in parallel until ...
13
votes
4answers
2k views

what is the process for replacing 12V car battery?

What is the process for replacing the 12V battery? How would I clean the contacts of the terminals? My OEM battery in 2008 Jetta SE 2.5L appears rather clean, including the terminals, but I recall ...
6
votes
2answers
2k views

AirbBag and 4x4 light is on after changing BMW X3 battery. Why?

After I changed my BMW X3 2008 battery at home the 4x4 and AirBag light is on. Any ideas why? Some people claim that changing BMW x3 battery is not straight forward, however, they don't explicitly ...
7
votes
2answers
3k views

Removing a car battery - order of wires explanation

Q1: When one removes a car battery, why does one start with the minus wire? Is it because if we remove the plus wire first it may touch the body of the car and close the circuit, causing a short-...
4
votes
4answers
1k views

Does draining a battery typically leave it in a state that it won't take a charge?

My son borrowed a car and the battery seemed fine, car started fine every time. However it died after my son left some overhead lights on in the car overnight. We jumped it, and he drove about 20 ...
2
votes
1answer
240 views

Car stalled and restarted after some minutes

I have a very old car which uses mechanical transmission (Maruti Zen) Recently while driving on the road, I switched off the engine because of heavy still traffic. I forgot to turn off the head ...
7
votes
2answers
1k views

How to detect a failing car alternator..?

Is there some way we can predict that the car alternator is about to fail in order to avoid a discharged battery situation on the road.. Although it will slow the sound of horn and will dim the ...
4
votes
4answers
23k views

Should I use coca cola or baking soda + water to clean my battery clamps?

The clamps that are attached to the car battery are corroded, I was told either of these liquids will work. Which one is better? Is there a how to guide on the exact steps I need to take? With my ...