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Well first you go to the fuse box and find stop light see if it has blown if not go to the rear and remove the globe holder plug assy which has either double or single light bulb if double get test light and touch either wire and get someone to turn on the ign switch [on but not start] and also put foot on the brake pedal ,if the test light dont light test the other wire base ,if no light comes on then go to the stop light switch mostly on the brakeline connection box under the bonnet or it could have a brake switch in the cab above the brake pedal and that will have either a broken wire or switch unserviceable .
There are two switches on the brake pedal, one for brake light, and one that kicks out the cruise when you hit the brake. That switch is closed when depressed (ie; brake pedal is up) and opens when pedal is pushed away from the switch, (unlike the brake light switch which closes when the pedal is pushed). This means it must be positioned and adjusted correctly for cruise to work.
Check under the dash for the switch hooked to the brake pedal assembly, this switch activates your brake lights, push the brake pedal with your hand does the plunger on the switch move? if not see if you can pull it down if you pull it down see if your brake lights are on if yes replace switch. if no, check it for power with a twelve volt test light, if you have power replace the switch. if no power check the fuse for brakes lights see your owners manual for location. Good luck.
If you make the jump with a wire at the switch and the brake lights work your new and old switch are not adjusted right on the brake peddle arm. make sure when you move the brake peddle that the switch is moving right to make/break the switch.
Your brake pedal....at the top under the dash a switch attached to the pedal brake pedal switch spring is hooked it might have came of or might need adjustment counterclockwise in the adjustment.adjust and inspect
check all your fuses if fuses are good check brake lite bulbs see if they are blown. if bulbs are good get a test lite see if you have power to the bulb sockets have friend apply brake pedal you test power going into bulb socket if you have no power brake lite switch behind brake pedal could be burnt out. p.s dont forget to check all fese relays when checking your fuses.
The alarm system usually uses the parking lights, not the brake lights so you'll have to test the brake light system. If your car did use the Brake lights absolutely,,, then your brake lights would be good & that would generally mean it's the fuse or the brake light switch.
I suggest that you check the fuse first with a 12 volt test light or multimeter, if it is good with current coming through, you'll need to test the brake light switch,, it's located just above the brake pedal, with the brakes applied you should be getting voltage at both terminals (my chart shows those wires as black/white) if so, then it must be the bulbs.
there are a few other options but this is the basic brake light system.
check brake light switch under dash follow brake pedal up to steering column where they meet is brake light switch check for properly in place than test switch if bad replace
test the brake light switch at the top of the lever brake pedal is attached to, it is most likely defective, u will have to remove the panel under the dash to see the switch, with a 12 volt test light (avail from any parts store) test for voltage at one side of the switch, when u press the brake pedal u should have voltage (test light illuminates) at both sides, if not the switch or the connector is bad..
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