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Hi Kate: According wth the Silverado Owners Manual, the HORN fuse is located "underhood electrical center" that its located on the drivers side of the engine compartment near the battery. Lift the cover for access to the fuse relay block...
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I had this happen on a 2000 escort..The prolblem was in the fuse box itself..The computer KEEP ALVE MEMORY cicuit is tie with the flashers and horn ..And when the flasher or horn blew the circiut shorted and cause the car to shut off..Look very close to the fuse for the flashers or horn,, and see if you see a spark when turn the flashers on ,,or blow the horn..Crazy but i seen it before,,and had to replace the fuse panel..The one inside
check all ur fuses for continuity first, then u can also try to swap out ur fuel pump relay with another relay that looks jus like it, be sure to use a relay like for ur horn or ac relay something that wont affect necessary or direct engine circuits like for ex. an ecm fuse or bcm fuse. if fuses r good an swappin relays wont work, next is to trace bak from fuel pump ur wires an possibly keep back probing to see if u have a broken wire from relay box to pump . good luck hope this was helpful . in ur fusebox ur fuelpump fuse should b labeled or easily found in fuse box legend, most likely on bak of fusebox cover....
You may have a short circuit in your horn button causing the
fuse to blow when you press the button or in the horn itself.
1. Locate the horn under the hood normally in the front of
the engine compartment.
2. Once you locate the horn, disconnect the wire from the
3. connect a VOM (Volt Ohm meter) to the horn's wire.
plus(+) side to the wire and negative (-) side to ground
or some metal part on the car.
4, set the VOM to dc voltage and have someone press the
horn button. You should read 12 volts on the VOM, if
not you have a short in the horn button, if you do mread 12 volts
you have a short in the horn. Replace the horn....
sounds like you have a bad ground somewhere. Check every ground strap that you can find, make sure it's tight, and not corroded, etc. Sounds like the accessories are trying to find a ground, and going through the brake light to do so, thus burning out from too much current.