Instrument voltage limiter replacement help

Electrical & Ignition

  1. repsol17

    repsol17 Well-Known Member

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    Hey all,
    From much research it appears I need to replace my instrument voltage limiter on my '70 Roadrunner. From looking at it, the only way to get my hands on it is by dropping the steering column.

    I've already taken off 3 nuts with washer from the bottom steering column bracket and the column dropped about 3/4" and that's it. I have never replaced one and don't want go any further for the fear of damaging something.

    What steps are taken next, I must be over looking something else but can't seem to see what.

    any help would be greatly appreciated
    Thanks
     
  2. 440Coronet500

    440Coronet500 Well-Known Member

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    Unhook the battery power first! 440'
     
  3. repsol17

    repsol17 Well-Known Member

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    No battery installed and yes a 440
     
  4. AR67GTX

    AR67GTX Well-Known Member

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    If just trying to drop it lower you can remove the screws securing the mounting plate at the firewall. The screws are accessed from inside and under the dash. At least that applies to 66/67 cars, I think 68-70 are the same. Remove the screws and the column should drop to where the rim rest on the seat cushion (if seats installed).

    Or are you wanting to remove the column?
     
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    • repsol17

      repsol17 Well-Known Member

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      Seats are installed, I just need to lower to seat (if needed). Previously I had removed the two bolts that attach the floor plate of the column (from inside) to the firewall as well as the three washers and nuts at the column bracket. After that I figured it would of dropped to the seats but it didn't.

      So I stopped...I didn't want to force anything until I asked for advice.

      At this point, the column bracket is still affixed to the column even though I removed three nuts and washers. Should the bracket pop off or am I missing something else.
      The steering column does flex downward but only about 3/4".
       
    • 69plywgn

      69plywgn Well-Known Member

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    • 69plywgn

      69plywgn Well-Known Member

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      Also, there are solid-state voltage limiters available from some aftermarket parts suppliers.
       
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      • repsol17

        repsol17 Well-Known Member

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        I've been looking at the same drawing as above. There must be something else holding the column up though. It feels like there's to much resistance on the column to just lower with ease.
         
      • turbine68rt

        turbine68rt Turbine Bronze Member FBBO Gold Member

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      • 65-440

        65-440 Well-Known Member

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        Take off the 2 nuts at the dash then the 3 bolts at the firewall...it'll move then
         
      • dadsbee

        dadsbee FBBO Gold Member FBBO Gold Member

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        There's THREE bolts on the underdash retainer....
         
      • 69plywgn

        69plywgn Well-Known Member

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        Click on the link to the service manual in post #6 and go to Section 19.
         
      • Big Bad Dad

        Big Bad Dad Well-Known Member

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        You have to take out the bolts holding the floor plate to the firewall for the column to drop onto the seat.
         
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        • repsol17

          repsol17 Well-Known Member

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          As well as the three bolts holding the lower column bracket? is there something else I'm missing?
           
          Last edited: May 3, 2021
        • repsol17

          repsol17 Well-Known Member

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          Is this the column bracket you're referring to as the underdash retainer?
           
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          • Big Bad Dad

            Big Bad Dad Well-Known Member

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            yes
             
          • repsol17

            repsol17 Well-Known Member

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            After these fasteners are removed does the column simply drop or does it pulled away from the firewall then drop?
             
          • AR67GTX

            AR67GTX Well-Known Member

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            It should simply drop although the plate will pull away from the firewall a little. Not sure about your exact year but on my 66/67 cars there is a small column seal plate that bolts with two bolts to the firewall seal plate which in turn bolts with 4 bolts to the firewall. Sounds like later cars use a 3-bolt plate.

            You will have to knock the roll pin out of the coupler to get it to pull back or remove.
             
          • Sixpactogo

            Sixpactogo Well-Known Member

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            I think you are missing one bolt. Four on the floor plate and three nuts and one bolt on the column. It will drop down to the seat then.
             
          • repsol17

            repsol17 Well-Known Member

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            Thanks everyone for helping out. 4 bolts on the floor plate and 3 nuts/washers for the column bracket.

            Every gauge (fuel, alt and temp) works except the oil. So I'll have to look into possibly a new sending unit

            Very simple and thanks again everyone
             
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