Wierd headlight prob
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Joined: Sep 2005
Posts: 98
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From: Middle Tennessee
Car: 84 trans am
Engine: 305 H.O. with small cam
Transmission: th350 with manual valvebody
Axle/Gears: 3:73's
Wierd headlight prob
well, ever since ive had my car the right light didnt pop up, now in ready to fix it. I switched around all three relays to see if i could find a bad one, but no matter what i did, the left would only pop up. So i went to advanced and bought a relay, and replaced the one beside the radiator on the passenger side, which i have been told is the isolation relay, cuz it looked real funky. Know the wierd part. When i replaced the old one with the new, niether one would pop up, and again i switched em all around, and neither one would come up, put the old one back on and the right would pop up, like normal. I can even hear the right one come one so i dont think the gear is stripped, and if it was, would the little **** spin? Are all three of the relays the same type? Are there anymore located one the car? Fuses? and lastly, ive been told there was a switch on the actual motor, is this true? Thanks yall, i would really like to fix this.
There are two torque-actuated limit switches in each headlight door motor. If you can hear the right motor operate but the headlight doesn't move, the problem is not likely electrical but mechanical in the headlight assembly. If you are only hearing an actuator relay clicking, there may be an electrical problem.
If you turn on the headlights and manually raise the headlight door by rotating the ****, does it close by itself when the lights are turned off? If it does, you may have a problem with either a motor end limit switch, the actuator relay for that motor, or the wiring.
Diagnosing it by simply replacing parts is not efficient, and may not ever solve the problem. Instead of a $10 relay, purchase a cheapo $10 voltmeter and start diagnosing the circuit.
Make sure there is battery voltage present at each headlight motor actuator relay. A blown fuse link can disable either headlight motor, and each one is protected separately, so if only one is working, a fuse link may have failed.
If you turn on the headlights and manually raise the headlight door by rotating the ****, does it close by itself when the lights are turned off? If it does, you may have a problem with either a motor end limit switch, the actuator relay for that motor, or the wiring.
Diagnosing it by simply replacing parts is not efficient, and may not ever solve the problem. Instead of a $10 relay, purchase a cheapo $10 voltmeter and start diagnosing the circuit.
Make sure there is battery voltage present at each headlight motor actuator relay. A blown fuse link can disable either headlight motor, and each one is protected separately, so if only one is working, a fuse link may have failed.
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