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Thread: dome and thurd brake light

  1. #1

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    dome and thurd brake light

    Hi everybody! I got a 1988 4wd Mighty max with D4BX hyundai porter engine swap non turbo, the dome light works, but later the floor was changed and then they cut the light wires, i need a fully diagram of the wires, from the battery to the light... All the sensor wires and light wires are ok but under the dashboard there's one yellow//white wire cutted... I dont know where's the other wire.... Anybody can help me?

  2. #2

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    Here is a dome light diagram for a 1988 Dodge Ram 50 and a brake light diagram. Hope it helps you.Click image for larger version. 

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  3. #3

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    Andy thank you so much!!

  4. #4

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    But there's one yellow with white wire disconnected, these wire goes to the dome light and the fuel tank... The wire is cutted right behind the dash

  5. #5

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    Are you sure? I think the wire from the fuel level float is yellow. I don't think the fuel tank and the dome light would be connected.

  6. #6

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    Yes 100℅ sure, under the driver seat the wire splits in 2 wires, and one goes to the dome light... Soon I post a picture

  7. #7

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    Click image for larger version. 

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ID:	15410wires to the dome light
    right door sensor: green+red = ok
    left door sensor: green+red = ok
    power wire: red+black = ok
    yellow+white wire: ?

  8. #8



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    Put a volt ohm meter on them. The tank wire will be a variable ground so the ohm will change from the reading you take and wright down to when you check it again in 2 days after driving it around. The light will have 12V all the time. The turd brake light will only have 12V when hitting the brake. Unless it's a ground style.
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  9. #9

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    bryan8118,
    Your '88 has a third brake light ???
    Looks like the extra wire may be part of a CARGO LIGHT option.
    I do not see 3'rd brake light wiring in the diagrams posted.
    Just guessing, as I have no idea what was done to the cab? --- "floor change "??

  10. #10

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    Yes, my mm has a third brake light but my dad destroy the light :/ that was a long time ago... The dome light still works but for no reason stopped working :/ the dome light doesn't work after the truck's floor was changed, and the yellow with white wire is disconnected behind the dash, and i dont know where attach the wire.... And my truck only has the third brake light... Never a cargo light

  11. #11

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    Pics of cab ???

  12. #12

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    maybe tomorrow, i'm working

  13. #13



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    As far as I'm aware 89 and down, maybe even a few years newer also, never had a third brake light. Only a cargo light for the bed. Don't think these trucks got a third brake light until maybe 93?
    Josh
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  14. #14

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    @DroppedMitsu yes bro, my truck has a third brake. My truck is japanese (not RHD) and also there's no switch to on/off the cargo light. Because never has one

  15. #15



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    The cargo and drug light were the same switch inside the cab on the dome light itself. (first gen) They just fall apart from the sun. There one of the hardest parts to find in good working order. I would just delete the brake light because if it had one, good luck finding one. But you can try these guys. http://www.msrecycling.com
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