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Check the brake bulb socket for short , clean replace bulbs , check connector to rear licence plate lights . Also trailer harness for short , all on same fuse circuit .
the socket (or board) that the bulbs are on are known to go bad. its actually a common repair. the lights coming on when vehicle is running is just a parking light not the brake light. you either installed the wrong bulb(needs to be a double filament) or the board is no good. Good luck
No there not connected, replace the brake light
1999 Chevrolet Blazer Auto Light Bulb Size Guide Low Beam Headlight Bulb Size: 9006 High Beam Headlamp Light Bulb Size: 9005 Parking Light Bulb Size: 3157 Front Turn Signal Light Bulb Size: 3157 Rear Turn Signal Light Bulb Size: 3057 Tail Light Bulb Size: 3057 Stop Light Bulb Size: 3057 High Mount Stop Light Bulb Size: Assembly Fog/Driving Light Bulb Size: 880 or 881 License Plate Light Bulb Size: 194 Back Up Light Bulb Size: 3156 Front Sidemarker Light Bulb Size: 194 Ash Tray Light Bulb Size: 161 Glove Box Light Bulb Size: 194 Map Light Bulb Size: 168 or 211-2 Step/Courtesy Light Bulb Size: 168 or 211-2 Trunk/Cargo Area Light Bulb Size: 211-2 Under Hood Light Bulb Size: 93 Instrument-General Light Bulb Size: 161 or 37 or PC194 or PC74 Check Engine Indicator Light Bulb Size: PC74 Hi-Beam Indicator Light Bulb Size: PC74 Seat Belt Indicator Light Bulb Size: PC194 Brake Warning Light Bulb Size: PC74 Automatic Transmission Indicator Light Bulb Size: 194 Directional Signal Indicator Light Bulb Size: PC74 As for the horn, inspect the fuse and relay and most common it would be a bad ground wire or worst a bad horn due to corrosion. Horn will be located in the drivers side fender. Thank you for using fixya.
If your right side brake light is working then it won't be a brake fuse as all brake lights are on the same circuit. Check the wiring harness connection for the left side.
in most cases the stop + tail lights are on the fuse circut .
as for the location of the fuse box i don't know what or where the fuses
you found are some fuses are found under the hood on top of the left fender well but rarely any light fuses your best bet is the owners manual
if not check the drivers side kick panel if its behind there it will be marked if not the lower dash may have removeable panel about 4"wide
also marked or the firewall with a black plastic cover or under the dash
facing down with or without cover
I just Know that you replaced the bulb ,try a test lite ,make shure it's grounded well poke inside the socket for the bulb this metal socket gives the bulb both electric and a ground ,this is the problem,good luck.
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