This might be caused by a bulb that is ready to burn out. When they get close to burning out, they do funny things like burning really brightly or pulsating, etc. It's possible that your lights might have been wired improperly, too.
All sounds ok, just out of intrest are the bulbs low energy/fluorescent and/or dimmable switch?
you need to check your motor mounts and the balance of your tires. tires first
your acuator is pooched change it but check the fuse first drive safe
You have to determine the cause first. Check the horn switch and contacts, fuse, relay and the horn itself.
The switch or the relay, check the cheapest, or simplest thing first, which could be the relay, but the symptom points more to the switch.
Check the fuse first then the brake light switch
There are A few things that could cause this, The first thing to check is if there is Freon in the system, Do this by removing the cap on one of the adaptors and use A tiny screwdriver to push the button inside, If it has pressure then you have freon. Next, replace the limit switch, You do not have to lose freon to change this, There is A schrader valve that automatically shuts when the switch is removed. If those are not the problem I suggest you take it to A repair shop for checking out.
Under the hood, on top of engine, way in back, next to the distributor. Difficult to gain access to without removing the distributor first.
First guess would be a bad ignition switch.
First you must start by removing the entire ignition, itself, on the Nissan 200SX. It should be fairly easy, you will just need the correct tools. Once you have bought the new ignition switch, attach it to the ignition and then re-install the ignition into the Nissan 200SX.
there is a felt panel underneath the glove box (for RHD cars) 3 plastic clips need removing, once these are removed (by pulling the centre first) the felt panel comes out completely, the brake switch is then visible. Twist anti-clockwise to remove.
Removing the ignition key switch from a 1998 Chevrolet truck is a relatively straightforward process. Before beginning it is important to make sure that the truck is off and the battery has been disconnected. To begin you will need to remove the steering wheel by first removing the center wheel nut with a 12" socket and wrench. You should then use a steering wheel puller to remove the wheel. Once the wheel is removed the ignition key switch will be visible in the center of the steering wheel. To remove the ignition key switch you will need to remove the retaining clip and then unscrew the bolts securing the switch in place. After the bolts have been removed the switch can be removed and replaced with the new one.
First you have to remove the steering wheel, that's why I would leave it to a pro. There's a Haynes manual (#38025 (1420) that has the complete instructions for removing the steering wheel and ignition switch. Try Amazon or Ebay to find one. They're dirt cheap now.