I have played a Taylor 510 for about 20 years and I need to send back to Taylor for some need repairs. I know it will take 3-6 months to get it back and I am thinking about buying a Takamine ESN10c to use while its gone. Your opinion

Refer to the link, you can absolutely sand or file the bottom of the saddle, or even the top if you know what you are doing. I am a professional luthier.
https://www.youtube.com/watch?v=6DpLRfbv9ok

David, you have excellent taste! Both guitars are excellent: Martin has had a reputation as a premier guitar line since 1833- almost 200 years! The Taylor guitar company started in 1974, and is currently (according to Wikipedia, quoting a USA Today article) the #1 guitar maker in America.

I can see why the choice is difficult- they are both Rosewood guitars with Sitka spruce top on a cutaway body, and they are both incredible players.

The Taylor is a little more expensive at $3,999 than the Martin $3,399.

It will come down to which you like better and what kind of music you play- if you record, ask a professional sound engineer which will sound better for your particular style. I happen to like the Taylor neck, but that's mostly because I play a 12- but I cannot see how you would be disappointed with either of these fine instruments.

You are likely correct that you have trained the battery. The battery is located at near the tail line.

http://www.taylorguitars.com/global/pdfs/es_guide.pdf

More likely a failed selector switch. Try working it back and forth a few dozen times. Contact cleaner may be tried too, squirting in the back of the switch.

Take it to a local luthier to have him file the fret ends. He will also be conversent with the best way to prevent it reoccuring in your enviroment.

Replace the battery. Batteries tend to recover and then go down again when they get weak. Use GOOD alkaline batteries NEVER rechargeable types.

The first thing i would check is the ac adapter .Make sure you are getting the correct voltage from the adapter.If you know how to use a voltmeter or know someone that has a volt meter,check it with it unplugged from the guitar pedal,most of these have a voltage range from 9 to 12 volts dc.you could also take it to your local radio shack or local repair shop and they will be glad to check it for you for free.after you confirm the adapter and it is ok then the next thing you will check is the input jack assy on the pedal,input jack assy are soldered onto the board at the factory,these jacks ,no matter what it is are famous for cracked solder joints where the pins of the jack go into the board because of stress delivered to it during plug ins and plug outs.if you dont know how to use a sldering gun or dont want to you will have to take it it to your local repair shop-cost should be around 15.00, 20.00 tops,make sure that your guitar cables are good,check the 9volt battery inside the unit if it takes one,if its dead that could be your problem,if all above fails i would send it back to the factory or wherever you bought it.,good luck been playing for about 30 years myself,rock on

If you just bought the guitar, take it back. Taylor has good warranty programs, take it back to the dealer. You may have a bad connection inside where the saddle pick up plugs into the graphic preamp, the fact that you hear a sound when you put the battery in or out indicates very little. You may have a bad preamp, like I said, if its new, don't wait get it back to the dealer or contact Taylor.

I have read that the problem is in the FX send/return jacks which oxidize if not used much. All you have to do, apparently, is ram a jack plug in and out a bunch of times. This breaks up the oxidation, and allows the amp to work properly again.