probably your blinker switch (multi-accessory switch). The high mount brake light is wired directly from the switch on the pedal but the rear two lights are wired through the pedal switch and then through the the blinker switch on the steering column. Almost all of those blinker switches go bad.
First check the flashers fuse .Then replace the flasher with a good one. There might be two-one for turn signals and one for 4ways. Or they could be one.
There are separate flasher relays for the hazard lights and turn signals. The flasher relay may be out on your blinkers. The relay for the hazards is behing the fuse box. The relay for the blinkers is behind the lower dash panel to the right of the steering column.
BNC connectors, Ts, barrel, 4ways, and the all important terminator.
If the vehicle is going under 15mph and has its 4ways on then yes except for interstates
I own an 89, so they should be set up the same. There are two separate flashers for the 4ways and turn signals. The 4way flasher shoud be clipped under the dash on the driver side and the turn signal flasher is plugged in under the dash on the firewall, also on the driver side.
Up under the dash over the steering column there are two flashers and the lower one is for the 4ways
find all the fuses near the brake pedal. for my car i have to take off one wing nut and then you just pull the plastic down. before doing this turn your 4ways on and try to follow the sound.
two=1way three=2ways four=3ways five=4ways six=5 ways seven=6 ways eight=5ways nine=4ways ten=3 ways eleven= 2 ways twelve=1 way. Seven has the most ways, so seven is the most commonly rolled number.
The flasher relay is under the steering column.........the 4ways and the left and right turn is all in the same unit.
3500 pounds but considering the age of your pickup that number probably doesn't hold merit. I have an 89 toyota pickup v6 single cab, and also a 1992 toyota 4runner, v6. I usually pull my bass tracker pro 190 boat. Its roughly 19 feet long and weights around 1100-1200 pounds. Both of my toyotas can pull the boat but going up steep hills can be a challenge Depending on how long and steep the hill is, i generally need to downshift and drive slow as balls up the hill. I typically put my 4ways on and creep up the hill. (The hill would be like a mile long at a 45 degree incline). So to answer your question, i would say your bad boy could handle up to 3000 pounds but pulling things is not really an enjoyably process. A bigger truck like a ford f150 is so much different and easier. Last but not least, stopping can be even worse than pulling. You need to be extra careful about stopping. You can burn through your brakes pretty easily.