You have a dead short to ground on that circuit , You need to go to www.bbbind.com/ for free wiring diagrams an electrical distribution diagrams . You'll want to check an see what all loads are on that fuse . Loads = lights ,components,motors etc.. Then if your not familiar with automotive electrical circuits an trouble shooting I suggest you go to youtube an check out basic electrical trouble shooting an how to find shorts etc... Also it would be good to check out how to read electrical wiring diagrams . There is a wealth of information on you tube for beginner auto repair an even for professional Technicians . Do you know anything about auto electrical repair .
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SOURCE: 2002 Dodge Neon 20 amp FP/ASD fuse #21 keeps blowing
It appears that it is part of the fuel pump circuit, so I would concentrate on wiring harness & connector at fuel pump, clean it real good, and apply dielectric grease to the connection, as well as the fuel pump relay, connector & harness.
SOURCE: 20 amp ignition fuse keeps blowing
I'm curious, does this vehicle have an alarm/remote starter? If so I expect the installer didn't wire it correctly ... it was an all too frequent issue, with inexperienced installers we had .... I would first suspect any add-on device first (if any) ... In answer to your question ... I know it does have a relay (Starter solenoid is a relay and built onto the starter) As far as it being a relay or the IGN switch ... I'm skeptical.
SOURCE: 20 Amp FP/ASD Fuse #21 keeps blowing.
hmm. lt look like there are poor joints in your wiring specially the groung wire. check the diagram of your auto. check the unit diagram for which the fuse blows. usually the fuse blow when there is a short circuit. if you look around you will find it.
good luck
ehsan.
SOURCE: 98 grand cherokee asd relay blowing fuse
The fuse it doing it's job, you have a short ( Wire that is connected to a ground, that draws too much power )
If you have an electrical schematic ( Repair manual ) find out which wires are connected to that fuse and check them for any chaffing, cuts, unnesassary twists, or corrosion.
If you have a ohm-meter, isolate the system ( by disconnecting the fuse, and other connections. Then check for any resistance on wires that should not be connected ( because you disconnected them ) by having one Lead on the wire's connector and the other meter-lead on your car's frame. A good wire will not have continuity if it is isolated.
SOURCE: 2004 Dodge Ram 1500 blown fuel pump fuse
I DONT KNOW IF U ARE A MECHANIC BUT THE BEST WAY TO SOLVE THIS PROBLEM IS GETTING A WIRING SCHEMATIC. IT WILL HELP U SEE IF ANYTHING ELSE IS WIRED INTO THE CIRCUIT BESIDES THE FUEL PUMP
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