Turn singals and hazard flashers work. tail lights work. Top brake light works. When brakes are applied, the top light works but the two lower lights do not. Brake light switch is hot to the cruise control box under the hood through a white wire.. Schematics show the white wire goes to the brake lamp, and other wires go to various cruise control functiions and shows the colors of the outgoing wires, but not the brake lamp. Any suggestions.
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The tail light is usually a bulb with lower wattage, so it won't glow as brightly as the brake and turn lights.. There should be one or two other bulbs in either of the two tail assy's. The turn signal can use the same bulb as the brake light. If so, it's up to the flasher assy to direct the lights to both come on, and/or for one to flash if the brake and turn signal is on, e.g.. There could also be a backup light.
So if the brake and turn lights don't operate, look to the fuses, and flasher assy. for possible replacement.
For 1989 Jeep Cherokee the Flasher is located: * Front seating area, driver side, under dash, above kick panel, mounted in bottom of convenience panel for Hazard flasher * Front seating area, driver side, under dash, above kick panel, mounted in top of convenience panel for Turn signal
Check at the light socket in the rear, where your lights don't work. You need a test light or a voltage meter, and check to see that you have a groun there, power for your parking light, and power to the brake light. You should have power for the parking lights seeing that it works, and a ground. Just verify that your power for the brakes is getting to the bulb, or not. Just a good place to start.
And you are correct that if the third brake light works (top) your brake light switch is fine.
I agree. My brake light dont work. Only the third brake light does. The running lights work but when i apply the brakes the rear tails dont light up.
I currently have this issue along with the signals dont work unless I bang the top of the steering colum. The hazard switch doesnt work either. If the signals dont work it makes this very quick clicking sound on the passenger side. I checked the fuses and they are good. The bulbs still work. The brake switch works cause the third brake light goes on. And seeing as I am having a problem with signals.....GM says I have to replace the switch in the steerg colume. Its a little box about the size of a cigarette pack. If you take apart the panels off ( right behind the steering wheel, where the hazard switch is) ...that is where it is located. Its plugged into the signal lever. Hope this helpa....Good luck everyone with this issue.