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Re: vehicle starts, howwever transmition does not shift.
As soon as you say that the battery goes flat it pins one thing at me your alternator most cars these days run from the alternator and not from the battery this can stop warning light ans wipers etc it also charges the battery while driving however it dose not explain the transition not shifting into gear change the alternator and let me know what happens
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Check the switch of the trunk light if it's shutting off when the trunk close. The indicator light on your dashboard says something's wrong. Although the trunk bulb consumes small power when switched on (i guess it's only 5W), but draining out the battery power depends on how long the vehicle hasn't been started to re-charge the battery.
There is most certainly something draining the battery in the car. I would start with all of the door and interior light switches. Then to items like the radio and fans. I personally had found that my blower fan for the heat/AC was not turning off in my truck causing it to drain. If you have a rear wiper motor that is also suspect. Keep posting as you find things out.
Starting with the battery light, the warning light means the alternator is not charging the battery. It could be a faulty alternator, or a problem with the wiring between the battery and the alternator. Normally you can drive a vehicle for several miles on the battery alone. If you have charged the battery and it checks out ok, you would need to check the wiring from the battery to the alternator and to the fuse box for problems.
Chances are the check engine light came on also. You should have the vehicle scanned for codes, it could be that the output speed sensor has failed. This could put the transmission into limp mode (second gear) and cause the speedometer not to work. I would guess this to be an inexpensive repair, .6 hours labor plus the cost of the sensor, $16.99 at O'reillys ...I hope this helps
I would look closely at the charging /electrical system and primarily the alternator.This unit under load should put out 100 amps and maintain voltage over 13.6volts to charge correctly and have the capacity to run all the electrical accessories you have mentioned...
your alternator is likely on its way out. you should take your car to a trusted mechanics shop and have the charging system tested.Its only a matter of time until the alternator stops charging and you'll be stranded on the side of the road Hope this helps..........Good Luck!