I am having problems with my emergency flashers working as well as my parking lights and turn signals. I've replaced fuses but they only work for about 30 seconds after I replace the fuses.

Do you have brake and parkng lights? The turnsignal switch on the column is just designed to relay a path to the flasher and then it is designed to interupt the brake and some of the parking lights lights, which cause the flashing on and off. Double check fuses double check bulb socks and bulbs for good contacts. Does the 4 ways work? If the lights all flash then locate the turn signal flasher and switch with emergency flasher if possible to rule out relay. If those are all good and the emergency flasher lights work and bulbs, then you would have a problem with the turn signal switch. Hope this all helps

Check fuse block. Electrical always boils down to fuses.

this car have DRL? day light running lamps?>? option
or manditory in canada. do tell !

so the fuses blew again, and you didnt look?
id fix either park/ hazzards.first
both work with key in pockets for EMERANGACY uses, even
when 100 miles from car, keys in pocket, by DESIGN. (all cars)
so due to that fact its a very simple system.
but in 2007, they makers do all they can to make it more complex
than ever necessary, (saves money with copper)
the 2 features are hot all the time, that means they wire to the
battery directly with ONLY a fuse, to stop fires.
so id bet it blew the fuse (got trailer wiring hacks in back>?) collision damage not fixed right>?
do you have the factory trailer option?????

park seems best., easier
it has 2 fuses to the rear.
the PARK relay closes, and powers the fuse and then lamps.
so both cant blow. left and right are Fuse 7 and 9
the BCM , (body brain puter) energizes the park relay
so seems its not.
my guess is the BCM has lost power.

in the dealer they can scan for BCM errors. and say fast what is wrong.

the list for PARK dead.
1. Ineffective or missing relay. 1. Test and replace park lamp relay if required. 2. Ineffective control circuit. 2. Test and repair open park lamp relay control circuit if required. 3. Ineffective switch. 3. Test and replace multi-function switch if required. 4. Ineffective BCM inputs or outputs. 4. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
here is my list
all park lamps burned out, (no way) but had it happen in 1980.....ask how? (alternator went nuts to 30v)
relay park missing or bad. (pray)
the park switch( in combo-mult- section switch is bad) nah.
The combo failed to tell BCM of this state change (comm fails)
the BCM failed to hear the command.
the BCM is bad or lost power (fuses)
the BCM failed to close the park relay.

the BCM has 3 power fuses. fues 34 is hot all time, id bet that fuse
allows the BCM to turn on parks, at any time.
others are key power, fuse 22, and 13. to BCM

the back unlocks doors, and does so via FOBs. car locked and parked and no key in ignition, so again, fuse 34 rears ugly head

i hang hat on 34, but got tired, if reading 50 pages of power distrabution and comms.
it is very complex car, and one of the first cars to do this....

The parking lights, dash lights, turn signals, and hazard flasher should be 4 different circuits.
So you would need to know exactly what that fuse protects, then look for the short to ground.

Most likely this is a brake light switch issue. Replace switch.

If your emergency flashers don't work, all flasher bulbs are fine, but flashing too fast, then check and replace Hazard light switch.

About your 1992 Buick Park Avenue 3.8L SFI OHV 6cyl. the Flasher is located:
Hazard flasher: Front seating area, driver side, under dash, mounted above kick panel

Turn signal: Front seating area, driver side, under dash, driver side of steering column, mounted on support bracket

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

there is a short in your liting system
e

The emergency flasher and the turn signal flasher are two separate items. You could have a defective T/S flasher.

The turn signals don't work, but the emergency flashers do? If that's the case, replace the flasher, you have 2 flashers, one for emergency (hazard) flasher, and one for the turn signals. It should be on the fuse block under the dash.

Your F--150 has 2 flashers, emergency and turn signal. Both are mounted on the fuse block under the dash. The turn signal flasher is mounted on the front of the fuse panel, the emergency flasher is mounted on the rear of the fuse panel. so replace the turn signal flasher should solve the problem. Let me know how it goes.