I seem to be having problems since the cold weather has started. The battery of my MX5 does not last longer than 24 hours if not used. I have had the RAC looking at it several times and said that it could be my alarm draining the battery but I had it checked by someone else and said that there was nothing wrong with the alarm and it couldn't be the alarm responsible for battery draining too fast than normal.
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I had a problem with my car not wanting to start in the cold. It was then I learned about CCA (cold cranking amps). I lived out west and had never heard of cca. You said your amperage is correct so this is prob not your solution. I purchased a battery with high CCA and my car starts every time now. Last week it was below zero and it dragged a bit when I first tried to start it but then started. The higher your CCA the better. Cost a little bit more but so worth it.
This really sounds like a problem with your battery. I know you said you checked it, but is it really putting out the appropriate voltage (12.66 volts) and CCAs? Even draining the battery once can damage it (especially in cold weather), and cold weather reduces the CCAs a battery can put out. A weak battery can cause those codes. When the vehicle hesitates to start, does that typically happen on colder mornings or after the car sat for longer periods of time? I would double-check your battery. If it's the original, it's near its end of life anyway.
the car won`t start in cold weather even when plugged in alternator was changed 4 months ago just changed battery thinking it was the battery but seems like something is draining the battery overnight? Maybe its a bad connection??Plz help!!!
It probably just needs charging. Cold weather can take a toll on older batteries, especially when they are left sitting for long periods of time. Starting the engine every day is ok, but the short run time isn't replacing the energy it took to start it.
Have you tried checking the battery? Try to give it a jump with another car. Cold weather kills car batteries FAST. Does the car crank over at all? Or does it just make a clicking sound without actually turning the motor? If jumping it gets it started, replace the battery and you shouldn't have any problems. Batteries typically last between 2-5 years depending on their use, if you have a lot of sick car audio and electronics pulling juice, it will cause a "deep cycle" which car batteries were not designed for and that will kill them quick too. If replacing the battery works for a while, but then it dies soon thereafter, you might need to start looking for possible short circuits or current draws. Hope this helps!
It may have something to do with the cold draining your battery. Cold weather brings out the worst of any minor faults the battery may have, that won't arise in warm weather, so trying to start will take what little juice is left, give your alternator a slight nudge and then give you just enough power to start up. If you do have to replace a battery, it will be during the winter. Hope this helps, if only a little ;)
weather gets cold starter will draw more cold crank amps! battery must be able to provide so check battery for load test if stands up then I would replace that power sucking starter this is what they do before they quit on you in summer it is un- noticeable cold snap plays it out well good luck and this is the ideal place to start!!John/toronto canada