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I don't know if there is a relay but the head light switch controls the taillights You can check the auto parts store and see if they have a listing for a taillight relay otherwise You will need an electrical tester or test light. First connect one side of the test light or meter to a good ground.Take the probe of the test light and test the fuse on both sides and make sure it lights. If it is good on both sides try testing for voltage at the tail light sockets With the light switch turned on, If you have voltage at the socket you could be missing the ground to the tail light bulbs.or you could have bad bulbs or corroded sockets.An other possibility if no voltage is at the sockets you could have a defective headlight switch.Beyond that you will need a factory service manual with wiring diagrams or a detailed manual such as Mitchel's or one from Alldata
it sounds like a parking light wire is not connected. look for wire or check the connection, I don't think that both light bulbs would have the lower wattage wire in the bulbs themselves would be burned out.
need to know if your third brake light up high is working or not.if it isn't,you need to check the brake light switch on the brake pedal with a test light,one side hot all the time,the other side should turn hot when brake pedal is pushed.
If you get power at center terminal with a test light, (careful, don't touch side of socket.) then try grounding (clamping) test light to outside of socket (which is your ground for bulb) . If test light doesn't light, it's bad ground.
If you have access to a simple 12 volt test light, you can remove the bulb you replaced, turn on the turn signal and park lights and see if the test light lights up. If the turn signal contact blinks the test light and the tail contact lights the test light, you know your power supply to the bulb is good.
Next you will check the ground.
Using your test light, carefully touch the tail light contact with the test light tip and touch the test light ground to the socket ground. If the ground is good the test light should light.
Let me know what you find and we will go from there.
Pull the light bulbs and test the bulb sockets, use a 12 volt test light probe, kinda looks like an ice pick or awl, with the clip lead of the test light at a good ground, probe the contacts to the bulb with the lights on, if the test light glows then there is 12 volts to the socket, if not probe the wire to the socket for power, if it is ok then replace the bulb socket, the dealer can supply this part. 1st though make sure the bulb is good, swap out a working bulb to the non working side,