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Thread: Calling Electrical gurus - 68 fastback interior lighting problem

  1. #1
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    Calling Electrical gurus - 68 fastback interior lighting problem

    Hey folks. Regarding my 68 fastback...

    Interior lights come on when the passenger door is opened.
    They DO NOT come on with the driver door open. Nor do they come on with the headlight switch turned counter clock wise.

    I replaced the HL switch. No change.
    I replaced the doorjam plug/switch in the drivers door, and the interior lights worked for about 2 hours...then never worked again.

    The wires to the doorjam are getting 12v (the same that happens on the passenger side wires). I double checked that the new plug was good, and it is.
    The HL switch is getting 12v when turned cccw, but no lights. (Headlights and dash dimming all function as normal).

    Why would they work for a while, then stop? I don't know what to look for next.

    Please assist me. I need help with this one. I will welcome any input.

    Barry B.B.

    "No question is stupid; if you don't know the answer!"

  2. #2
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    Check voltage at the light (bulb out). You could have a ground problem so if you can....check between terminals and to chassis.

    John

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    Quote Originally Posted by Skunk View Post
    Check voltage at the light (bulb out). You could have a ground problem so if you can....check between terminals and to chassis.

    John
    I will check that tonight. Thank you.
    Stay tuned.

    Barry B.B.

    "No question is stupid; if you don't know the answer!"

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    I work with the 60's ford mastermind. He knows those cars top to bottom, in and out. I pick his brain for you.

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    Quote Originally Posted by T_RAT View Post
    I work with the 60's ford mastermind. He knows those cars top to bottom, in and out. I pick his brain for you.
    Cheers T-Rat

    Barry B.B.

    "No question is stupid; if you don't know the answer!"

  6. #6
    Contributor Ò¿Ó tulowd's Avatar

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    sounds like intermittent or rusted ground path on the left side of the car - switch ground and or door pin grounds sound like they are not clean and good.
    Wires could be corroded - black copper = junk
    Opinionated beyond the pale

  7. #7
    Senior Member Kechke's Avatar

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    The biggest problem with our 1st gen Mustangs with O/E wiring is bad grounds, good advice on the previous posts.

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    Quote Originally Posted by Kechke View Post
    The biggest problem with our 1st gen Mustangs with O/E wiring is bad grounds, good advice on the previous posts.
    I went just now to check the suggestions posted above, and wouldn't you know it...the lights all come on! AND turning the HL switch cccw...they all come on too! 😡😡😡😡

    i may just have to see how it is in a day or so, and report back to you all.
    If it happens again, I will then try some of your suggestions.
    I'm still open to some, as I'm learning. From them also.

    Cheers all. I will report back.
    Barry

    Barry B.B.

    "No question is stupid; if you don't know the answer!"

  9. #9
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    Quote Originally Posted by Kechke View Post
    The biggest problem with Mustangs with O/E wiring is bad grounds, good advice on the previous posts.
    I adjusted your post

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