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.
Here is some information to consider and check. You should concentrate on the taillights first since that does not require you to constantly step on the brake pedal.
The bulb outage module, or lamp outage module, is located to the left of the drivers left leg while sitting in the seat. It is just slightly up under the dash, clipped into a black housing. It should be a white colored box with one large electrical plug with many wires plugging into it.
The switch above the brake light switch should be a cruise control deactivation switch, so that the cruise control turns off when the brake pedal is pressed.
I had the same problem with my 2003 santa fe. Do you have any brake lights out in back? Weird as it is, as soon as I fixed a burned out brake bulb, my cruise worked again. The only relation I can think of is that tapping the breaks causes cruise to turn off - so maybe a broken brake/tail light passes a singal to cruise control from some reason???