INST Fuse blowing

Discussion in 'Electrical and Ignition' started by moparmandan, Jun 10, 2018.

  1. moparmandan

    moparmandan FABO Gold Member FABO Gold Member

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    Got back on it today for a while. Traced the orange wire to the radio light, heater switch light, gear selector light, and ash tray light. Wire to the ashtray tray light worn slap through grounded to the frame right behind the bulb socket. Score!
    Now for the orange wire that goes to the dash lights. Still reads short to ground. What do you think? All the cluster lights worked during bench testing. Where's the most likely place for that wire to be grounded?
     
    Last edited: Jun 13, 2018
  2. MOPAROFFICIAL

    MOPAROFFICIAL Well-Known Member

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    Check gear select and amp gauge
     
  3. MOPAROFFICIAL

    MOPAROFFICIAL Well-Known Member

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    2 orange wires come out of the one fuse one goes to a split off ,the other one goes to the Gear select...forementioned split-off goes to a white wire that goes to your bulkhead it looks like it ties/piggy backs to a black wire that goes off to ...either the parking brake , printed circuit board connector ...or the turn signal cam/switch..

    View attachment 1715187336

    View attachment 1715187337

    73ValiantA.jpg

    73ValiantB.jpg
     
    Last edited: Jun 13, 2018
  4. 67Dart273

    67Dart273 Well-Known Member

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    Is this with the cluster unconnected? If not just about has to be "right in" the cluster
     
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    • 67Dart273

      67Dart273 Well-Known Member

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      This is incorrect and I already addressed this earlier. What you are seeing is the radio power connector. The white and red are connected, not the orange. Orange is unique in Mopars it is "only" connected to orange

      radio.jpg

      ^^This what you are looking at?^^
       
    • moparmandan

      moparmandan FABO Gold Member FABO Gold Member

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      Delete
       
    • moparmandan

      moparmandan FABO Gold Member FABO Gold Member

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      No it is still connected. I think you are correct sir. I'll pull the cluster back out and see what's going on. Thanks a lot for your help, it ain't long now!
       
      Last edited: Jun 13, 2018
    • moparmandan

      moparmandan FABO Gold Member FABO Gold Member

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      Thank you. That's the same thing I was thinking. I really appreciate you pointing out the differences in the mymopar color coded diagram and the FSM. I would have been chasing my tail.
       
    • moparmandan

      moparmandan FABO Gold Member FABO Gold Member

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      Unfortunately I think you got caught in the same trap I did. Evidently there are some inconsistencies in that wiring diagram. The service manual is really the thing to use when troubleshooting the wiring. Thanks for trying to help though. It is really appreciated.
       
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      • MOPAROFFICIAL

        MOPAROFFICIAL Well-Known Member

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        Yeah, i sourced that from the same site apparently. There used to be a site i used, bookmarked it, would print diagrams... That were accurate... haha... it's gone now and all I have left of prints are 1971 dart, I could have referenced it but it wouldn't be 100%correct.
         
      • MOPAROFFICIAL

        MOPAROFFICIAL Well-Known Member

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        Right on, yeah when i see threads go on a bit without resolve I feel obliged to try offer any help i can.
         
      • 67Dart273

        67Dart273 Well-Known Member

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        It's easy to do there are "unclarities" in the factory prints and also some mistakes over the years.

        One mistake for several years involved the horn and start wires going through the bulkhead connector. They magically were connected on either side of the connector LOL

        And "Ma" never made any real effort to describe some of the odd stuff, and the seat belt interlock is a great example.
         
      • moparmandan

        moparmandan FABO Gold Member FABO Gold Member

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        What's your best guess on "right in" the cluster? Sitting here brainstorming at work on break..............
        All sockets and bulbs new.
        Amp meter bypassed.
        5v factory voltage reg replaced with a 7805.
        Fuel level and temp gauge seem to work.

        As removed:

        View attachment 1715187440
         
      • 67Dart273

        67Dart273 Well-Known Member

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        Can't see what you are trying to post. I would just take it apart and inspect it. Might be something like, part of the connector pins "pushed through" and touching the cluster frame underneath, "I guess" it could theoretically be a shorted bulb, though I've never seen one.
         
      • moparmandan

        moparmandan FABO Gold Member FABO Gold Member

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        Thanks. Will do. Looks like we lost power to the tan wire also. Probably took out the headlight switch because we don't have running or tail lights now either. But we have power on both sides of fuse number 5 , the tail light fuse. No biggie already picked up a new headlight switch.
         
      • moparmandan

        moparmandan FABO Gold Member FABO Gold Member

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        Corrosion in the tail light fuse slot. All dash light working.
        Now just fun stuff. My son said the key in ignition buzzer is the most annoying thing he's ever heard. LOL
        Ashtray light working. Wipers work great, park great. On to the glove box and dome light!
        Oh yeah, one question. Where the hell does the heater control light plug in? Forgot to do that while everything was apart. Oops. Am I going to be able to get my hand up in there?
         
      • moparmandan

        moparmandan FABO Gold Member FABO Gold Member

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        Is that the hole? Upper left of pic?
        s-l1600.jpg
         
      • 67Dart273

        67Dart273 Well-Known Member

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        Yep
         
      • tony elia

        tony elia FABO Gold Member FABO Gold Member

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        just start with the diagram, see which devices(loads) are on that wire. disconnect all the loads. put each load back on the circuit until your fuse blows. then you can pinpoint which part of the circuit is the culprit. just repaired an alfa for a friend. isolated everything at the fuse block.pulled all the wires and put back on one at a time. alfas known for eletrical problems, quite fun actually!