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The Jeep Grand Cherokee was redesigned for the 1999 model year; the 2000 models have minimal changes. This model is also known as Jeep WJ.

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Taillights assembly blinkers not working

Isn't bad bulbs so does that mean wiring is bad

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lindaswaffordboyd  could be so you would have to check on the junction connector. My first check however would be the combination flasher relay

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Here is some reading about troubleshooting from the manual

DIAGNOSIS AND TESTING - TURN SIGNAL & HAZARD WARNING SYSTEM

When diagnosing the turn signal and hazard warning circuits, remember that high generator output can burn out bulbs rapidly and repeatedly. If this is a problem on the vehicle being diagnosed, be certain to diagnose and repair the charging system as required. If the problem being diagnosed is related to a failure of the turn signals to automatically cancel following

completion of a turn, inspect the left (lighting) multifunction switch for a faulty or damaged cancel actuator and inspect the turn signal cancel cam on the multi-function switch mounting housing for damaged lobes or improper installation. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING aNY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

(1) Turn the ignition switch to the On position. Actuate the turn signal switch or the hazard warning switch. Observe the turn signal indicator lamp(s) in the instrument cluster. If the flash rate is very high, check for a turn signal bulb that is not lit or is very dimly lit. Repair the circuits to that lamp or replace the faulty bulb, as required. If the turn signal indicator(s) fail to light, go to Step 2.

(2) Turn the ignition switch to the Off position. Check the ignition run fuse (Fuse 20 - 10 ampere) and the flasher fuse (Fuse 4 - 15 ampere) in the Junction Block (JB). If OK, go to Step 3. If not OK, repair the shorted circuit or component as required and replace the faulty fuse(s).

(3) Check for battery voltage at the flasher fuse (Fuse 4 - 15 ampere) in the JB. If OK, go to Step 4. If not OK, repair the open fused B(+) circuit between the JB and the Power Distribution Center (PDC) as required.

(4) Turn the ignition switch to the On position. Check for battery voltage at the ignition run fuse (Fuse 20 - 10 ampere) in the JB. If OK, go to Step 5.

If not OK, repair the open fused ignition switch output (run) circuit between the JB and the ignition switch as required.

(5) Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Remove the combination flasher from the JB and replace it with a known good unit. Reconnect the battery negative cable. Test the operation of the turn signal and hazard warning systems. If OK, discard the faulty combination flasher. If not OK, remove the test flasher and go to Step 6.

(6) Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (run) circuit cavity in the JB receptacle for the combination flasher. If OK, go to Step 7. If not OK, repair the open fused ignition switch output (run) circuit between the combination flasher and the ignition run fuse (Fuse 20 - 10 ampere) in the JB as required.

(7) Turn the ignition switch to the Off position. Check for battery voltage at the fused B(+) circuit cavity of the JB receptacle for the combination flasher. If OK, go to Step 8. If not OK, repair the open fused B(+) circuit between the combination flasher and the flasher fuse (Fuse 4 - 15 ampere) in the JB as required.

(8) Disconnect and isolate the battery negative cable. Disconnect the instrument panel wire harness connector for the turn signal and hazard warning switches from the left (lighting) multi-function switch connector receptacle. Check for continuity between the ground circuit cavity of the instrument panel wire harness connector for the left multi-function switch and a good ground. There should be continuity. If OK, go to Step 9. If not OK, repair the open ground circuit to ground (G200) as required.

(9) Check for continuity between the hazard switch sense circuit cavity of the instrument panel wire harness connector for the left multi-function switch and a good ground. There should be no continuity. If OK, go to Step 10. If not OK, repair the shorted hazard switch sense circuit between the left multi-function switch and the combination flasher as required.

(10) Check for continuity between the hazard switch sense circuit cavities of the JB receptacle for the combination flasher and the instrument panel wire harness connector for the left multi-function switch. There should be continuity. If OK, go to Step 11. If not OK, repair the open hazard switch sense circuit between the left multi-function switch and the combination flasher as required.

11) Check for continuity between the left turn switch sense circuit cavity of the instrument panel wire harness connector for the left multi-function switch and a good ground. There should be no continuity. If OK, go to Step 12. If not OK, repair the shorted left turn switch sense circuit between the left multi-function switch and the combination flasher as required.

(12) Check for continuity between the left turn switch sense circuit cavities of the JB receptacle for the combination flasher and the instrument panel wire harness connector for the left multi-function switch. There should be continuity. If OK, go to Step 13. If not OK, repair the open left turn switch sense circuit between the left multi-function switch and the combination flasher as required.

(13) Check for continuity between the right turn switch sense circuit cavity of the instrument panel wire harness connector for the left multi-function switch and a good ground. There should be no continuity. If OK, go to Step 14. If not OK, repair the shorted right turn switch sense circuit between the left multi-function switch and the combination flasher as required.

(14) Check for continuity between the right turn switch sense circuit cavities of the JB receptacle for the combination flasher and the instrument panel wire harness connector for the left multi-function switch. There should be continuity. If OK, test the left multi-function switch. (Refer to 8 - ELECTRICAL/ LAMPS/LIGHTING - EXTERIOR/LEFT MULTIFUNCTION SWITCH - DIAGNOSIS AND TESTING). If not OK, repair the open right turn switch sense circuit between the left multi-function switch and the combination flasher as required.

Start by replacing the flasher relay;-)

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Can Old Turkey confirm that the relay could fail on only a back quarter set and no where else~?

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IIjust had the same problem. Turns out there is a circuit board in the tail light assembly. That's what is bad. You need to replace the assembly. Did mine and it solved the problem

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Check the blinker relay

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