You likely have a frayed wire to the stop light.
signal light
You probably have a short in one of the light assemblies, turn signal lever, or the wiring.
The signal light hazard is not working because of an electrical fault. Call an electrician to fix this.
There is a short in the signal light circuit.
The turn signal module is combined with the hazard light module. You need to remove the dash trim to get to it. It is right behind the hazard light switch.
Turn signal bulbs and hazard bulbs are the same bulb. When the turn signal is turned on, the indicator light on the dash flashes in tune with the turn signal. When the hazard lights are turned on, an extra fuse which is live, powers the hazard flashers, even if the car is turned off.
Sounds like you simply have A burned out bulb, Turn the signal on and look at all the lights to see if any are burned out. Could be A marker light if its in the turn signal circuit.
Sounds like there is a problem with the turn signal switch but it could be another problem. First you need to see if the hazard light's work normally when turn signal is not on, if it does the the turn signal switch is the problem. If your hazard lights do not function when you turn the hazard light switch on, then it's a simple fuse or flasher canister that has gone bad and your hazard flasher is in the on position. If the Hazard light's have a bad fuse or flasher canister and is in the "ON" position it can cause the problem you describe.
Sounds like a blown bulb somewhere on the righthand signal side.
The flasher is part of the hazard light switch.
crash into wall
on a 1989 Isuzu pickup you need to take out the left speakerto get to the signal and hazard light flasher ..The control box for the flashers and turn indicators is all contained within the steering column. Not the easiest to get to.