* Turn Signal Switch: This is a stalk on the steering column. When you move the stalk, it sends a signal to the flasher relay. The direction you move it determines which side's lights flash.
* Hazard Switch: This is a separate switch, usually a button, that activates the flasher relay to make all four turn signals flash simultaneously.
* Flasher Relay: This is an electronic component that provides the intermittent flashing action. It receives a signal from the turn signal switch or hazard switch and interrupts the electrical current to the lights at a specific rate. If the relay fails, the lights either stay on constantly or don't flash at all.
* Wiring Harness: This is the network of wires that connects the switches, relay, and lights. Breaks or shorts in the wiring will prevent the lights from functioning correctly.
* Turn Signal Bulbs: These are the bulbs in the front and rear that actually produce the light. Burned-out bulbs are a common cause of malfunction.
* Turn Signal Modules (Possibly): Some Jeeps, particularly those with added features, might have a dedicated turn signal module that controls the signals, but this is less likely on a base 2000 model. A problem here would typically cause widespread issues.
* Grounding: Proper grounding is crucial. A poor ground can lead to inconsistent or failing lights.
In short: The switches tell the flasher relay to activate, which sends power to the lights through the wiring harness. If any part of this system fails, the lights may not work correctly. Troubleshooting involves checking the bulbs, fuses (check the owner's manual for the relevant fuse(s)), wiring for breaks or shorts, the flasher relay itself, and the switches.
