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79 140hp 181 cid wiring harness

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  • 79 140hp 181 cid wiring harness

    Hey guys long time lurker first time poster. Trying to find a wiring diagram for. 79 140hp 181 cid. I replaced the fuel pump, its now getting fuel to the carb. But I’m still not getting fire. The guy who installed the motor didn’t quite know what he was doing. He had the firing order wrong, but I suspect he has also just put the distributor back in wrong and not at TDC because it is turned about 90 degrees from being parallel with the cylinders. But I’m not even sure the engine wire harness is hooked into the right places. I noticed a black wire just hanging from the harness behind the motor, can see two wires hooked up to one spot on the shift switch . Once I figure out where everything properly hooks to I’ll try to figure out how to check the plug wires points and the coil. Thanks for any help!

  • #2
    Service your points

    Links to manuals (that have schematics) in the stickies
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

    Comment


    • #3
      Yes after I find out how to hook the harness up properly, I will adjust distributor, service points and new plug wires. But right now I cannot find anything on the harness.

      Comment


      • #4
        Stand by,
        Click the picture to enlarge it
        Last edited by Bt Doctur; January 13th, 2020, 03:10 PM.
        NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

        Comment


        • #5
          NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

          Comment


          • #6
            wiring colors are standard.
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

            Comment


            • #7
              What colour wire is coming out of the back of the alternator (the big output wire)? It will be either Orange or red/white. And do you have a voltmeter or an ammeter on the instrument panel?

              With that information, I can get you the right drawing.

              Chris...........
              xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
              The world takes on a whole new perspective when viewed from 100’ below.
              1972 Bertram ‘Bahia Mar’ 20
              2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
              (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


              Comment


              • #8
                There is an orange and black, but then there are 2 other wires that come off the alternator going into the harness. One is red and the other is purple or purple/white and yes there is a amp meter on the panel.

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                • #9
                  this one uses a voltmeter gauge
                  click to enlarge
                  NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

                  Comment


                  • #10
                    Originally posted by Jpcaravelle View Post
                    There is an orange and black, but then there are 2 other wires that come off the alternator going into the harness. One is red and the other is purple or purple/white and yes there is a amp meter on the panel.
                    Something's not right. The engine harness colours are for a later engine, that uses BIA colours and a voltmeter not an ammeter... You can't mix instrument panels without significant wiring changes...

                    Chris....
                    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                    The world takes on a whole new perspective when viewed from 100’ below.
                    1972 Bertram ‘Bahia Mar’ 20
                    2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                    (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                    Comment


                    • #11
                      Alright I am going to try to get some pictures on here today. The rain has let up today, so maybe I can get out and mess with it.

                      Comment


                      • #12
                        assuming points have been serviced and the dizzy is stabbed correctly, to get the motor to run, simply provide 12 volts to the coil + and turn it over.

                        normally the coil + is supplied via a ballast wire or resistor in a points application which drops the voltage down to 6 volts. There is a wire off the starter "i" terminal which provides a full 12 volts during cranking (you never want to run points at full voltage for long)

                        back of the block is normally the system grounding point (where all the negative wires meet the negative battery cable)

                        wiring colors are standard (BIA and ABYC use the SAE color scheme)
                        grey wire is tach
                        purple wire is ignition (12 volt after key switch)
                        purple wire with yellow stripe is voltage to coil during cranking
                        yellow wire with red stripe is crank signal
                        tan wire is temperature
                        light blue wire is oil pressure
                        black is system ground
                        red is battery cable to starter
                        Orange is charge from alternator to starter
                        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                        Past Boats
                        1970 Wooster Hellion - Merc 9.8
                        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                        What’s behind you doesn’t matter.Enzo Ferrari

                        Comment


                        • #13
                          Red on large starter post along with + from battery. Purple/yellow on left small post yellow/red on right small. Light blue to oil sender. On the slave solenoid yellow/red top small post, black on lower small post red on left large post yellow on right small post. Gray and black to shift interrupt switch. Coil has Purple/yellow and what I’m assuming is the purple resistor wire on positive. Gray on negative and black from distrib on negative. Tan to water temp. Alternator has orange and black then purple to red and purple/white to purple.

                          Comment


                          • #14
                            purple/yellow is the full 12 volts from the start circuit to the points (ballast bypass)
                            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                            Past Boats
                            1970 Wooster Hellion - Merc 9.8
                            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                            What’s behind you doesn’t matter.Enzo Ferrari

                            Comment


                            • #15
                              Sign up today
                              I have put a wire from battery to coil still doesn’t crank. The motor spins but no fire (assuming everything I stated is hooked up correctly). When I get paid I’ll try to get new points. I’m sure the distributor wasn’t put in right either. I’ll have to find tdc and see if I can seat it in there. Seen alot of videos of people having trouble getting it in.

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