How do i test the old Fuses that look like Tubes, to see if they are good or need changed?

1985 Jaguar XJ6 4.2, All the fuses are in Tubes.



How do I test them?How do i test the old Fuses that look like Tubes, to see if they are good or need changed?
you can test fuses with a multimeter,put the meter on the resistance setting touch one lead to one end of the fuse and the other to the other end if the fuse is good t will show no resistance between the two ends,if it is bad it will show infinate resistance between the two ends(if good meter will go to zero,if bad meter will top out).if you pulled one and the cap came off the end it is definately bad,just use a pair of needle nose pliars or something to pull the cap out of the fuse box.the best way to remove glass fuses is with a fusepuller,less chance of breaking the fuse that way.Sometimes the filiment burns out at the end of the fuse where you cant see it,this is what usually makes the end caps pull off.How do i test the old Fuses that look like Tubes, to see if they are good or need changed?
The filament in the middle of the fuse should be gone that's how to tell a glass fuse is blown.
You can get that cap out with a small screw driver. Just pry it out. And you can check your fuses with an inexpensive ohm meter/continuity checker.
pull the fuse out and look into the glass tube and there is a metal wire that runs from side to side on the inside of the glass tube, if it's broke the fuse is bad, if you broke the fuse taking it out just get a screwdriver or a pair of needle nose pliers and get the broken piece out and replace with a new fuse.