Put a continuity check on it. This can be done with an ohm meter. If there is no reading then the fuse is open.
Test it with an ohm meter.
take it off and test it with a volt meter.
You know your car has blown a fuse if whatever the fuse is for suddenly quits working. For example if your radio is playing and for no reason quits it may be a fuse has blown.
Has the AC fuse blown in your system?
Pull it out an look at it. Most of the time you can easily see it is blown. If not check it with an ohm meter.
Remove the blown fuse. Replace it with a new fuse.
Check the fuse in your furnace to see if it has blown.
To determine if a fuse is blown, visually inspect the fuse for a break in the metal strip inside. If the metal strip is broken, the fuse is blown and needs to be replaced.
When a fuse is blown and needs to be replaced, you can tell by checking if the metal strip inside the fuse is broken or melted. Additionally, the electrical device or circuit that the fuse is protecting may not work or may show signs of malfunction.
A fuse is a deliberate weak link which will be blown if there is a power overload. When you blow a fuse, take the blown fuse out and throw it away as you would a blown light bulb, and replace it with another fuse of the same type. * In the old-timey fuse boxes a penny could be substituted for a fuse, but a penny is too strong to be blown, and the next overload will burn the house down.
You can easily replace it but you need to know why it blew in the first place. All fuses are marked on the fuse box or in the drivers manual as to which circuit they protect. Determine which circuit that blown fuse protects and inspect that circuit for troubles.
the amp wont work.Check the power fuse first.If this is ok, there is generally another fuse inside the amp that will need checking