How to Check Blown Fuses

[Jake95 10+ year member]

I know you can look at the fuse and see if its blown, but is it possible that you might not miss it? how else can you test fuses?

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[azbass 5,000+ posts]

useing a Digital Multi Meter and the Continuity setting.

 

[jd_man_90 10+ year member]

it is possible for a blown fuse to be overlooked, but to be sure it's not blown it's allways easiest to put a new fuse in and see if it works, or if you want to get fancy you can use a multi meter and ohm out the fuse from one side to the other which will tell you if the fuse is blown or not.

 

[regal8r 5,000+ posts]

hook it up across a car battery...if it snaps, its blown....if not, its blown //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[azbass 5,000+ posts]

wasting good fuses ftw!

 

[86yota 10+ year member]

See if the "bridge" on the inside is not connected anymore, discolored, burnt

 

[4runnercrazy 10+ year member]

most fuses you can just look @ them to see if they are blown

 

[Tiger Bass 5,000+ posts]

Umm, just take it out and look at it. Or replace it all together. Fuses cost all of $3 for a set of 10.

 

[lincolnls 10+ year member]

agu fuses are notorious for blowing not in the center but at the end, those can be tricky soemtimes to see.

but the easiest way to find out is just put in a new fuse

 

[ngsm13 5,000+ posts]

agu fuses are notorious for blowing not in the center but at the end, those can be tricky soemtimes to see.
but the easiest way to find out is just put in a new fuse

Yup, solder joints come loose.

I use a DMM and the continuity setting like azbass...

nG

 

[KaeZoo 10+ year member]

With a multimeter set for DC volts or a test light, attach the black lead to ground then probe each end of the fuse with the red lead. If you have voltage on one side but not the other, you have a blown fuse.

Standard automotive "spade" fuses have two access points at the top of the fuse, so they can be tested while they're still seated in the fuse holder. Depending on the fuse location, you may need to turn the vehicle's key switch on to get power to the circuit before testing.

This method is both much easier and more reliable than continuity testing.