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x2, disconnect all loads on that 20 feed.
to find which one is sorted
i use a circuit breaker in place of the fuse.
then i use my ammeter to find the load (device ) that is shorted.
saves burning up a box of fuses.
and finds the more difficult shorts... finds them ALL.
You have a lot of work ahead of you. Mostly taking the wiring harness apart and finding and fixing wires, What you described shouldn't happen. Yes you definetely have a short, several of them. Good luck.
a fuse of this size may be the ignition fuse or a fuse that powers high power draw units , fuel pump lights etc. However if it blows immediately then you have a dead short in that system like a failed relay or solenoid or a wire ribbed through or pinched shorting to earth. Carefully check wires from this fuse and look for the same colour coded wire on relays ,ignition switch starter solenoid etc.
Either the module itself is internally shorted, or the power wire to it off that fuse has a short-bare wire touching metal and blowing the fuse. You will have to examine your wiring and try to find the short. Has any moisture collected in back of, or around the fuse box? If it is a bad wire, it could be bad anywhere from the battery to the ECM. You might check with the dealer and see if the ECM can be tested for a short or malfunction, and if it can be done with it off the car or if it needs to be tested with it connected up. You may be able to run a new power wire from it's source to the fuse box and to the ECM. You sure need a wiring diagram for this. good luck.
you have a short to ground. Be very careful not to cause a fire when you perform the smoke test. instead of putting another fuse in, install a jumper wire in place of the fuse briefly and find the smoke
This all depends, if the fuse blows as soon as you put it in without stepping on the brake pedal then theres a dead short in the fuse box or the power wire going to the brake switch is shorting out, this 15amp fuse runs from the fuseox to brake light switch, so the short is between that but if it blow with brake pedal pushed then you said you dissconnect the rear brake light at fuse box and fuse still blows so the next step inwhich power is feed from this fuse is the following and you will need to unhook these components one at a time until short is gone. the next location is the the abs brake control module which is by the master cylinder area after that it goes to the cruise contorl servo also under the hood, then it goes to the shifter release solenoid which is very common problem, the wires melt or short out in that area, and next it goes to computer which i dont think is the problem and from there it feeds the rear lights and third brake light. hope this helps, good day.
a svinarich, In the engine compartment you will find a fuse box or power distribution box. Look inside the cover and it should tell you which fuse is for the left side high beam. Check the fuse as it may be blown. If the fuse is good then you have to check the wiring to the high beam. Wiggle the wires after turning the high beams on as there may be a short in the wires. Good luck with this.
Hopefully it will be in the circuit itself, try this install the fues with the MAF disconnected does the scan tool say high input,(how did you know it was low input),dont start it it does the scan tool show 5vlt ? Either of this way you have a grounded wire from power distirbution that goes to the MAF this wire is from power the distribution box or (engine fuse box goes that goes to MAF and is grounded . This is why you Ignition fuse blows to option fix and find this short or have someone who know how and is qualified to subsituted for another wire from Ignition to MAF ignition circuit at the power juction box (engine fuse box)
found the problem. there are three fuse boxes under the hood. the smallest one on the back corner on the driver side next to the 2nd small fuse box. there are three fuse boxes under the hood and one under the steering wheel. each has fuses for the trailer hitch lights. thanks.