The battery was replaced and now the radio in my 2003 gti does not work

Hi the fuel pump is located under the back seats , and under the flap of carpet is a round disc with three screws ! And underneath that you will find a big plastic ring which holds the fuel pump !! They are easy to take out and replace plug and play really ;) Disconnect the battery !! First and be careful please !! Good luck

I would suspect corroded connections at the battery or the battery needs replacing. It takes very little voltage to run the battery and dash lights, but lots more to run everything else. Remove the battery, clean the connections, and then charge the battery. Take the battery to an auto parts store and have it tested.

you may have one wire that touching another that is what make the fuse to blow or to many connection

they do leak kits in auto parts stores. if it's not that bad it should work. other wise, est. $200 gas tank, 3hours labor.

My sincere apologies for the delayed response.
I have only been a free contributor to this site for the last 4-months.
I am personally going back to answer your unanswered questions.

I do not know if you still need this information, however I am answering it either way.

Click on the following direct Link. It has several Diagrams you will need for your Timing Belt replacement. Included are the Cover Bolt Locations, Tool Needed and Marks for your specific engine.
You may also want to Print out these Diagrams for future use.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Again my apologies...

http://www.2carpros.com/car_repair_information/year/2003/make/volkswagen/model/gti/2003_volkswagen_gti_timing_belt_diagram_marks.htm

A dash kit is not needed, just a little modelling but not hard at all. The Factory double din radeo is a little taller than 4in so you need to space it out with a slim piece of mdf on the top and bottom of the new radio cage. Then the trim plate around the screen will fill all gaps perfectly.

chech realey and water senso tem.

check the fuse? some aftermarket radios may have an extra inline fuse as well.

test the alternator it could be draining your battery.

This worked for me (radio in 2003 VW Golf):
Radio says "CHECK" but is otherwise unresponsive. Turning car or radio on/off doesn't help.
On the far right of the radio, there's a round TUNER button. Press it for 5 seconds. Your screen will then show some digits, but the unit is still unresponsive.
Press tuner button again for 5 seconds. Radio should now be 100% again. Let me know if this works for you.