Remove cover from UBEC (underhood bus electrical center) front left of engine compartment and you will find 2 studs that will supply 12v. there is no interior fuse panel on an H-3. Be sure to fuse power supply after UBEC so not if but when horn screws up it will be a cheap fix.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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