91 hazard lights won't work

a friend had the car and left the hazards on, now they won’t work at all. The fuse if fine, flasher replaced, but I’m not knowledgeable about going beyond this point. Any suggestions?

which fuse did you check? the one on the cable attachment to the battery, or the central fuse box. pull off the battery harness. remove the fuse, and look to see if there is corosion where the fuse plugs in. then check the under dash fuse box and let me know. try playign with the little wire that goes into the inline fuse of the battery harness.

thanks! Turns out someone has some explaining to do about pulling the fuse out and not replacing it.

That is great! haha