Help me identify this fuse holder!

['70 C/10 SS500]

I have been wrapping up all the loose ends with my truck now that the 500 Caddy motor swap is complete. The wiring has been re-attached to the body and connected to thier components. Right now though, I have perfectly working headlights, (very bright btw now thanks to Rick's headlight conversion) side markers, tail lights, and dash lights. However, my turn signals only turn ON and do not blink. This usually is a bulb burnt out, but (even though I haven't verified) I don't think that's the case. While working to fix an ignition problem, a friend of mine broke this fuse while trying to open it to check it. I don't even know what this fuse is/ does. This is on a black wire with a white stripe. Can somebody tell me what it is/does please. Could this be the reason why my turn signals don't work properly.

Also, the fuse had either 32V or 36V on it??? Is that really the voltage that it is rated for? It also had a 4 on it, is it a 4 amp fuse? One more thing. Not just the fuse was broken when it was opened, but also one of the metal clips inside that holds the fuse broke off. Can I buy a new fuse holder at the local parts store or somewhere else and just splice it back in? Thanks for any help in advance!