The part supplied will be a L7810CV regulator Standard Regulator Pos 10V 1.5A 3-Pin(3+Tab) TO-220
NOTE **
*This part MAY also be used as a replacement for TCA700Y 10v regulator but for this application it has certain differences such as reversed pinouts which may require it to be mounted upside down with provision made to ensure proper heatsink contact .
The original voltage regulator is no longer in production, but is available in limited supply.
Part # 171 919 803, expect to pay $15-20 from the dealer.
But you do have a cheaper alternative, and its identical to what is being sold as a new replacement for 171 919 803.
This is an LM7810 (10v positive regulator).
The main difference between the LM7810 and the original TCA700Y is the way its installed.
On the TCA700Y, the regulator is laid flat onto the original metal heat sink.
With the LM7810, you flip it over, so the heat sink is up in the air.
You need to provide a metal spacer for the regulator to transfer the heat to the original VW heat sink. This is only required if you source your
LM7810 from an electronics parts supplier.
Why you might ask?-
This is because the LM7810 pins are opposite of the original TCA700Y