glass of 348 slow

thanks for the instruction. just did this. I entered through outside panel: x2 10mm nuts (inside towards front of the door), x4 5mm (I think) allen screws, x1 philips screw (rear of the door, door needs to be open).

These are the relays I bought. I wanted Bosch. a bit pricey.
https://www.amazon.com/gp/product/B004Z0WMHK/

** to answer the question above. yes, you "T" into the 2 existing wires.

my image.
https://ibb.co/tx72wgZ