VW is famous for a trick the engineers designed in to force you to go back to the dealer. All mechanics today are using "memory saver" devices when replacing batteries to avoid this expensive trick. Many cars will not come out of "park", and if the engine does start, it won't come up off of idle. They have to be skidded out of the shop, onto a flatbed truck for the trip to the dealership to have multiple computers unlocked.
This started to become a problem before 2004, but given the age of your car, there is an equally-good chance nothing happened other than some blown fuses and a locked radio. Due to all the computers' memory circuits charging up, there is a current surge when the last battery cable is reconnected. That surge often causes multiple fuses to blow for no other reason.
There's no specific fuse to check. Instead, use a test light to check all of them. If you need it, here's links to articles that show how to use these tools:
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Most spade-type fuses have two small test points on top. Turn the ignition switch to "run", then check at both test points on all of the fuses. If you find 12 volts on both for one fuse, that fuse is okay. If you find 0 volts on both sides, that circuit is currently turned off. Turn the ignition switch to "crank" while watching on that fuse. You're looking for any fuse that has 12 volts on one test point and 0 volts on the other one. That circuit is currently turned on and that fuse is blown.
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Tuesday, May 4th, 2021 AT 11:09 AM
