Where does this wire go? Found under oil filter.

Slant 6 Engines

  1. Mako21

    Mako21 Well-Known Member

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    Can someone help assessing where this wire with terminal goes so I can plug it in? I have included a picture of it. It’s was routed along the passenger side fender and hanging next to the oil filter. Engine is a 1976 225 slant six.
    Hopefully someone knows...thanks!!
     
  2. Mako21

    Mako21 Well-Known Member

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    Photo of wire

    800E0C78-A266-48A7-96C5-9F1F9356683F.jpeg
     
  3. eekvonzipper

    eekvonzipper My Member is Legendary! FABO Gold Member

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    Check the Top of your Oil Sending Unit... it might be for the Oil Light?
     
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    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

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      What color is it? Might be brake warning light which connects to the center switch in the brake distribution block or proportioning valve if equipped.

      You said pass side, ^^ might be, oil sender ^^
       
    • SGBARRACUDA

      SGBARRACUDA ROY FABO Gold Member

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      Looks like the oil sender type terminal.
       
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      • Badvert65

        Badvert65 Long Time Mopar Nut

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        It is for the oil pressure indicator. It plugs onto the sending unit under where the Oil Filter is mounted. If you want to be certain, just ground the wire and see what dash light comes on.
        -Matt
         
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        • Mako21

          Mako21 Well-Known Member

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          The insulation has become quite solid as is not very flexible. It seems to have a taken shape in the direction of the oil filter area, so I think you’re right it must plug into something around there. I’ll have to search better. Where exactly would the oil pressure indicator be located. At the rear of the filter ?
           
        • Dana67Dart

          Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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          Never just ground a wire. Check for voltage on the wire first.

          Others have suggested using a test light for this type of testing so you do not fry any wires.

          It would be best for you to get a wiring diagram and trace it out by color and location.
           
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          • Badvert65

            Badvert65 Long Time Mopar Nut

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            In this shot, the finned aluminun thing is where the oil filter goes. Just below that, you can see the oil pressure sender with wire attached.
            IMG_0181w.jpg
             
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            • 70dart340

              70dart340 Well-Known Member

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              Go to Mymopar.com and look up the schematic.
               
            • RedFish

              RedFish Well-Known Member

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              Gray wire with terminal for oil sender. Plastic insulator missing is typical. Replacement is available on line.
               
            • Mako21

              Mako21 Well-Known Member

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              This forum is the best. I found where it plugs in and guess what? Now when I turn the switch to acc just prior to start, the red oil pressure indicator light works in the dash. Great!! Thanks to all.
               
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              • Jim Kueneman

                Jim Kueneman FABO Gold Member FABO Gold Member

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                Many did not have the plastic connector. The M&H harness for the a '65 was just the terminal no plastic.

                Jim
                 
              • eekvonzipper

                eekvonzipper My Member is Legendary! FABO Gold Member

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                Why would someone Disagree with this?
                 
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                • RedFish

                  RedFish Well-Known Member

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                  So M&H didn't include the insulator for this terminal. That doesn't mean the factory didn't put on on it. I dont know the consequence of this terminal touching ground where there is only a warning lamp. Maybe just lamp stays on? I know shorted to ground can kill a oil gauge. There isn't a similar bare wire terminal anywhere else. There is my sign.
                   
                • Jim Kueneman

                  Jim Kueneman FABO Gold Member FABO Gold Member

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                  yes the light just stays on. The early ones only had lights I believe so they could save a few pennies by not having the cover. The original harness on the 63 did not have a cover either.
                   
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                  • 65 Cuda 340

                    65 Cuda 340 FABO Gold Member FABO Gold Member

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                    My 63 Valiant never had a cover on the oil light wire, either. Nor did the 62 Polara 500 convertible my parents owned when I was a kid. One day, maybe 1963 or 1964, I was cleaning on the motor. Next time Dad started the car the oil light came on. Neither of us had any idea why. Took it to the dealer, guy reached back, hooked up the oil pressure light wire and - Presto! - it was fixed.

                    My 67 Barracuda has an oil pressure gauge, and it does have a plastic cover over the wire to the oil pressure sending unit.
                     
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                    • SGBARRACUDA

                      SGBARRACUDA ROY FABO Gold Member

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                      I’ve never seen any type of insulation on the sending wire either.
                       
                    • BillGrissom

                      BillGrissom Well-Known Member

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                      At least slip heat shrink over the wire where the insulation is brittle. While in-there, if you may later change to an electric fuel pump, consider a 3-terminal oil pressure switch, as I did in my slant (SMP PN PS-64 switch). That can disable the fuel pump if oil pressure is lost, to both protect the engine and stop fuel flow after a crash. My slant engine has a bushing there for a 1/8-NPT switch, so I think the factory hole is 1/4"-NPT. Looks like I added the bushing, but forgot why, perhaps because my SB and BB Mopar engines have a 1/8"-NPT hole so could use the same switch.
                       
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