a3 sidelights

I have just bought some prism led drls and need to wire them into the sidelights ideally...
I have pulled the sidelights out, wrapped the wires round and then switched on the sidelights. the bulb lit up & the new led strip lit up for 5 secs before going out.
i've read a previous post similar to this but with no outcome.
if i change the 40 fuse for a 50 fuse in the fuse box will this resolve the issue ??? if not, then does anyone know how i can get the leds to stay on longer than 5 secs ???

Please help.