Dash swapping from F to M

Interior and Electrical

  1. Edward Anglemyer Jr.

    Edward Anglemyer Jr. Member

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    I understand that there is already a thread on this, but I have different questions.

    My 79 Volare has rear defrost and cruise control. I had ordered a wire harness which was said to be from a 77 Diplomat.

    I am noticing that the firewall plugs are backwards (volare is female, diplomat is male.) The Diplomat does not have the same options as the Volare.

    What I am trying to figure out is how much I would have to change for the firewall plug and how I can add the wiring for my Volare's options.

    Did I get the wrong year wiring harness?

    Thank you.
     
    Last edited: Apr 10, 2019
  2. Darth-Car

    Darth-Car Well-Known Member

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    Very different instrument clusters, and because of that the wire harnesses are totally different. You have a Volare' so you need a Volare' harness, or an Aspen harness. The Diplomat, or LeBaron harnesses will not work for you.
     
  3. Edward Anglemyer Jr.

    Edward Anglemyer Jr. Member

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    So I can keep my Volare harness for my Diplomat gauges? What will I have to switch so the harness will work with the gauges?
     
  4. Edward Anglemyer Jr.

    Edward Anglemyer Jr. Member

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    But could I use an M body harness for an M body gauge cluster?
     
  5. DCAspen

    DCAspen Well-Known Member

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    76-77 harness from dash to engine plug together under the dash and 78 up plug together on the firewall like early 70s mopars.You would need a harness from a 78 or 79 to fit your 79 Volare.
     
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  6. Edward Anglemyer Jr.

    Edward Anglemyer Jr. Member

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    Ok, that is the answer I was looking for. Thank you!
     
  7. F body Deconstructor Jim

    F body Deconstructor Jim Well-Known Member

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    you need a 79 F dash harness with rear defrost and cruise?

    somewhere in late 78 or beginning of 79 the plug became a true bulkhead connector on the F's...
    earlier harnesses wont fit directly.
    later wont work either due to the column changes for 1980.
     
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  8. DCAspen

    DCAspen Well-Known Member

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    Nice to see your back Jim,You still selling parts?
     
  9. F body Deconstructor Jim

    F body Deconstructor Jim Well-Known Member

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    bear woods.jpg :D
     
  10. BudW

    BudW Moderator Staff Member

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    Hum, not sure what that means, exactly.
    I hope he is still selling parts. He’s a great guy to work with . . . even though he’s proven me wrong a few times.
    BudW
     
  11. bbeep79

    bbeep79 Member

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    Translating lawyer speak to English, I believe it comes down to 'Does a bear s*** in the woods?'
    The answer would be yes, he still sells parts.
     
  12. 89.Fifth

    89.Fifth Well-Known Member

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    exactly! Love the cartoon for that.
     
  13. F body Deconstructor Jim

    F body Deconstructor Jim Well-Known Member

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    :D
     
  14. Edward Anglemyer Jr.

    Edward Anglemyer Jr. Member

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    Ok so I am just going to re-use my destroyed F harness. I have a question about the temperature gauge though. How do I send 5v power to it if the 1 5v on the F harness is being used for the fuel gauge?
     
  15. BudW

    BudW Moderator Staff Member

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    On the back side of instrument cluster, there will be a 5-volt voltage regulator, that looks like this:
    VRC 601.jpg
    This converts 12 volts to 5-volts. Correction, it turns on/off fast, to make a 5-volt supply voltage so it is more of an A/C (alternating current) 5-volts than a D/C 5-volts. The gauges will not respond quickly, so it works fine.

    The same 5-volt source supplies current to fuel gauge, engine temperature gauge and for oil pressure gauge (if equipped).

    Matter of fact you can take a spare fuel gauge sender to test the operation of the temperature or oil pressure gauges (all three has the same low and high range ohm reading).
    BudW
     
  16. Darth-Car

    Darth-Car Well-Known Member

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    AAAHHH It's so big! It's the voltage regulator that ate Chicago! That is definitely not shown actual size. :)