The trun signal lever needs to be replaced.
You probably have a burned light bulb, either in the front or rear.
None, as it doesn't transmit continuously.
Transformer
The 1999 Dodge Avenger signal flasher relay switch is located beneath the drivers side dashboard. The signal flasher relay switch will be between the gas pedal and the brake pedal.
The ABS and brake lights sole purpose is to signal you that you may have a problem with each / or one individual system. From your question we can assume that your ABS and brake lights come on continuously. There by we can safely deduce that you may have a problem with your ABS system and / or your brakes.
An Analogue signal.
a circuit that produces a continuously oscillating signal.
I've seen some turn signal dash indicators that stay on without flashing just when a bulb is burnt out. If the signal itself is flashing, and especially if the turn signal arm doesn't automatically retract when you turn, there may be a broken spring in the canceling cam inside the steering column.
a continuously variable signal. it could be electronic, mechanical, hydraulic, optical, etc.
100
analog signal
Your switch on your sterring wheel colum is bad. Replace.