First make sure you are using the correct size fuse if it blows some of the time and some of the time all is well. If it blows immediately then you either have a short in the wiring or the circuit is over-loaded.
the short wont be on the fuse you need to find out what is shorting out and causing the fuse to blow
Too much amperage in the circuit. Find what is causing the increase in voltage.
Heater Blower Fan, Cooling Fan, Or A/C Condenser fan? There is a fuse box in the front passenger door jamb. This is where you will find the blower fan fuse. You should find the Cooling and A/C fan fuses in the underhood fuse box. When I see problems with any of these fans it is not usually a fuse that is causing the problem. If a fuse is blown then there is another problem causing it to blow.
Fuses blow, in any application, when the current in the circuit exceeds the limit preset by the fuse selection. It is also possible, if the fuse terminals are corroded, for heat to be generated, causing the fuse to melt, giving the appearance of having blown.
where i the fuse for a fuel pump on 1991 gmc truck
When a fuse blows, you should replace the fuse and check to see what might have caused it to blow. It's a sign that there might be something causing too much current to flow in the circuit.
There's a short in the wiring of your vehicle somewhere causing the wires to cross and blow the fuse.
Fuses are designed to blow when an overload or short circuit condition exists on the circuit in which they are installed. This is a safety device intended to protecth the wire[s] from overheat damage, or causing a fire. The "fix" for fuses which blow repeatedly is to FIND THE FAULT in the circuit, REPAIR the fault, and ONLY THEN reinstall a new fuse, which should then NOT blow out.
You probably have an electrical short somewhere in the line.
wrong size fuse. wire from fuse to rear defrosted damaged and shorting to the body. wire at actual window shorting to body.
When a fuse blows, you should replace the fuse and check to see what might have caused it to blow. It's a sign that there might be something causing too much current to flow in the circuit.
no A FRN fuse is a slow blow fuse where an non is a fast blow fuse. In a pinch a slow blow fuse can be use in a fast blow circuit but not the other way around.