1972 vs 1973 Dash Wiring Harness

Discussion in 'Electrical and Ignition' started by Jim Kueneman, Nov 8, 2018.

  1. Jim Kueneman

    Jim Kueneman Well-Known Member

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    I have a '72 Duster that I am going to put a '73 Dart dash and AC system in. I am trying to decide what to buy from a dash wiring point of view. The M&H harnesses from Year One have a '72 A Body and '73 A Body that are over $100 different. I have looked at the schematics for the 2 years and there is very very little difference. Anyone have any thoughts on what the '73 harness would have that would make it $100 higher cost?
     
  2. el5dart

    el5dart Well-Known Member

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    im not sure the 73 a/c box will bolt right in a 72 it definately wont bolt right up in a 71
     
  3. MoparMike1974

    MoparMike1974 Well-Known Member

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    I think the only difference would be extra stuff like seat belt buzzers and such.
     
  4. KnuckleDuster

    KnuckleDuster Well-Known Member

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    I used a 73 harness in my 72. Not too much difference that I remember. I had to add a wire for the passenger door switch, I think. My AC/Heater box is not functional, so can't comment on that, but everything connected.
    I found the 73 harness in great shape on here from a member for $100 shipped, I would post a wanted ad first.


    *ALSO- read the disclamer on the Year One description for the harnesses about the connectors. Not sure if they are saying some are unavailable and missing???
     
    Last edited: Nov 9, 2018 at 4:08 AM
  5. Demonic

    Demonic Well-Known Member

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    I'm not 100% sure, but check your firewall cutouts carefully.

    For the wiring, check the cavity pinout, especially the alternator and fusibile link connectors. I know they vary between 73 and 75.
     
  6. Jim Kueneman

    Jim Kueneman Well-Known Member

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    [el5dart]
    I have already cut the firewall patch out of the '73 and welded it in the '72 so the physical installation of the '73 AC/heater box is already handled. The schematics show that the firewall plug pinout is exactly the same between the years.

    [KnuckleDuster]
    Thanks but I have the harness out of the '73 but I won't use 50 year old harnesses. I waffled on this with my Coronet until I started using some of the 50 year old harnesses and the blower motor switch connector got so hot I could not tough it because of the high resistance due to the years of corrosion in the factory crimp. If I had the energy to remove every connector and find every splice and solder them maybe but with as much money I am putting into the restoration a $400 harness is worth it.
     
  7. whitepunkonnitro

    whitepunkonnitro FABO Gold Member FABO Gold Member

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    Only difference between 72 and 73 that I can think of is are the connections for the heater/blower.
    74 is when things got crazy under there
     
  8. 67Dart273

    67Dart273 Well-Known Member

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    You do know? About the service manuals and wiring diagrams at MyMopar? Not sure all the 72's had electronic ignition. May have been split year/ option There were changes in smog equipment as well over the years 70--76 so check that out.
     
  9. Jim Kueneman

    Jim Kueneman Well-Known Member

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    Yup that is what I have been studying
     
  10. 73hcode

    73hcode Well-Known Member

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    The M&H wiring I bought for my 73 Sport from year one had a few pins in the wrong place. I am sure you also know there is an inside a/c harness and an outside a/c harness. The new wiring is very easy to use and I don’t regret spending nearly a grand on all I needed.
     
  11. 73hcode

    73hcode Well-Known Member

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    The M&H wiring I bought for my 73 Sport from year one had a few pins in the wrong place. I am sure you also know there is an inside a/c harness and an outside a/c harness. The new wiring is very easy to use and I don’t regret spending nearly
     
  12. Jim Kueneman

    Jim Kueneman Well-Known Member

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    No regrets on my Coronet either. The sense of security that there will be no wiring gremlins and no fires on the side of the road is worth a grand to me as well.