Blowing fuse r.r.taillight 964

[les mans]

After having installed a new set of taillights on
my 89 964 C4, all blinkers except the right rear are functional.
This particular one is creating a puzzle, because with the
old set there were no issues. The 7.5 a fuse is blown!
Any speculation on what might cause this, all wiring is like new.

[964TargaC2]

make sure the bulbs are secure in their base, may have twisted the glass part when installing it which would cause a short

[les mans]

I had new bulbs with new tailight set, bur replaced them anyway. Today I
checked with test light, to determine if power was there- was not! Again
it's difficult to understand, as old set was functional, more gray hair!