I checkd out that part and it appears to fit in the fuse box (my guess), however, according to my fuse diagram, it doesn't show a relay for the flashers. My fuse box says that fuse 12 is for the directional flashers, so maybe check that one.

Here is a description of the SD fuse box I got from this forum a while back. Maybe someone has updates or modifications to it.

Standing by the left front wheel looking into the fusebox, assume the relays are arranged as:

A E I K
B F J L

A = power seat controls
B = auxillary fan
E = power seperation relay for seats
F = Power windows
I = OVP (none on 83)
J = ACC compressor delay
K = rear defogger and sunroof
L = interval wipers

hope this helps! Good luck!

We really need aan SD manual posted online, like the 123 one