Further reasons to check your electrical system

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  • TheCafeKid
    • Mar 2026

    #1

    Further reasons to check your electrical system

    As much as I HATE, and I do mean H A T E, messing with wiring harnesses, I found yet another reason to make sure you clean and dress your connections, including the ones in your fuse block. The other evening I was helping a fellow member replace his RR, and rewire the charging system with new connections and eliminating the BS headlamp loop from the charging system. I installed the "sense" wire to the tail lamp connector and found that the RR was allowing as much as 16volts. Knowing this was no good, I consulted Steve over the phone on possible other locations to install the sense wire, as after testing we found a near 3 volt drop from the battery to there. I didn't have time to go through the whole system looking for bad connections at the moment, so for the meantime, we simply connected it to the battery. Not enough voltage seep there since the bike was ridden every day, and it kept the RR at a steady 14.5V. We decided to go through the system soon enough but this will work for now. But I was curious and started poking around with the VOM to see just how much voltage loss was happening at various points in the harness. I found a +/-3 volt loss at various points, including the main ignition feed, and the supply to the fuse block. I also found that it was most definately resistance caused, as one of the fuses was hot enough that when I grabbed the end it left a fuse end shaped BRAND in the tip of my thumb.... It hurt. And I cussed. A lot. So, the moral here is, check those electrical bits folks! Or you might get burned in more ways than one.
  • bwringer
    Forum LongTimer
    Bard Award Winner
    GSResource Superstar
    Past Site Supporter
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    • Oct 2003
    • 17072
    • Indianapolis

    #2
    Amen and dittos!
    1983 GS850G, Cosmos Blue.
    2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
    2015 Yamaha FJ-09, Magma Red Power Corrupts...
    Eat more venison.

    Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

    Celeriter equita, converteque saepe.

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    Comment

    • posplayr
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      • Dec 2007
      • 23673
      • Tucson Az

      #3
      Yes, but first line of defense is to convert your ignition circuit to being coil powered (slight mod to the coil relay mod).

      Once you have that connect the Honda R/R sense wire to the relay output (another problem solved).

      Doing what you can to clean the inside of your:

      Ignition switch
      Start switch
      Fuse box

      and then protecting with dielectric grease helps alot.

      I have also opened up my harness to get to the infamous Red "T" which splits between R/R and battery. Soldered that crimp on connector with a few more inside the harness by the time you get to the "T"

      P.S. it is not so much the voltage drop in the wire (even though it runs the length of the bike a bout 3 time) it is the corrosion in the crimp connectors or the crap bullet connections that causes voltage drops when alot of current is flowing.
      Last edited by posplayr; 08-13-2010, 04:59 PM.

      Comment

      • Steve
        GS Whisperer
        • Jun 2005
        • 35927
        • southwest oHIo

        #4
        Originally posted by TheCafeKid

        ... It hurt.

        And I cussed.

        A lot.
        ..... ..... ..... ..... ..... ..... ..... .....

        Yep, he's not kidding.

        .
        sigpic
        mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
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        Comment

        • koolaid_kid

          #5
          Originally posted by bwringer
          Amen and dittos!
          Are you volunteering?

          Comment

          • Sandy
            Forum Guru
            Past Site Supporter
            • Feb 2004
            • 7532
            • Cranbrook, BC Canada

            #6
            Do the relay mod at least for the R/R and electronic ignition. Even after throughly cleaning all connnectors and switches as good as possible I still had a .5 volt drop in my system. I think that is about as good as it will ever get and probably as good or better than it came from the factory. That was still enough of a drop for R/R with the voltage sense wire to over charge even a bit. Mine was charging at about 15.2 volts max which was enough to boil the battery dry after a while, about 3,000 miles a lot of which was high speed cruising at 95F+ temps. After installing the relay mod for my R/R sense wire, Dyna and a volt meter the level in the battery has remained unchanged for an entire riding season and the max charge voltage is now around 14.7. I was going to do the coils too but decided with such a small voltage drop it wouldn't really buy me much, especially for a stock bike.
            '84 GS750EF (Oct 2015 BOM) '79 GS1000N (June 2007 BOM)

            Comment

            • GabrielGoes
              Forum Mentor
              • Jun 2010
              • 925
              • New York

              #7
              Originally posted by Sandy
              Do the relay mod at least for the R/R and electronic ignition.
              is this in the stator papers? i want to know how to do this "relay mod" if anyone can direct me that would be great as i bought a new electrosport R/R and hooked it up EXACTLY as the old one was... how do you check the voltage on the R/R? sorry i am big noob i just learned how to do most mechanical things on my bike and now i have to work on my electrical side of things (HATE)
              Last edited by GabrielGoes; 08-13-2010, 11:25 PM.
              John 3:16

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              • posplayr
                Forum LongTimer
                GSResource Superstar
                Past Site Supporter
                • Dec 2007
                • 23673
                • Tucson Az

                #8
                Originally posted by GabrielGoes
                is this in the stator papers? i want to know how to do this "relay mod" if anyone can direct me that would be great as i bought a new electrosport R/R and hooked it up EXACTLY as the old one was... how do you check the voltage on the R/R? sorry i am big noob i just learned how to do most mechanical things on my bike and now i have to work on my electrical side of things (HATE)
                this is not the coil relay mod
                Technical Info posts that are deemed to be important or popular will be placed here for easier access. If you feel a post should be moved from the Technical Info forum to here then PM the Administrator with your request.

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                • GabrielGoes
                  Forum Mentor
                  • Jun 2010
                  • 925
                  • New York

                  #9
                  that thread has LOADS of info i favorited them and am going to have to study it for a couple hours then try to take some action... thank you very much for showing me that thread
                  John 3:16

                  Comment

                  • duaneage
                    Forum Guru
                    GSResource Superstar
                    • Apr 2004
                    • 6149
                    • Wilmington Delaware

                    #10
                    Once a year I spray critical connectors with De-Oxit which improves conduction and helps prevent corrosion. I get almost 0 drop across major components.

                    Any resistance in a connector will create heat that melts the plug. Can also start fires too.
                    1981 GS650G , all the bike you need
                    1980 GS1000G Power corrupts, and absolute power corrupts absolutely

                    Comment

                    • posplayr
                      Forum LongTimer
                      GSResource Superstar
                      Past Site Supporter
                      • Dec 2007
                      • 23673
                      • Tucson Az

                      #11
                      Originally posted by duaneage
                      Once a year I spray critical connectors with De-Oxit which improves conduction and helps prevent corrosion. I get almost 0 drop across major components.

                      Any resistance in a connector will create heat that melts the plug. Can also start fires too.
                      OK So the secret is out

                      But which one?
                      cramolin, contact cleaner, DeoxIT, contact lubricant, Hand Shield, CONTACT ENHANCER, electrical contact cleaner, RID-OX, terminal cleaning, Nutrol, contact cleaners, contact lubricants, oxidation, gold wipes, De-ox-it, De-ox-id, PreservIT, CaiLube MCL, gold guard, stabilant 22, CRAMOLIN, WD-40, Kontaktspray, Kontaktsprays, corrosion, ProGold, conductivity, contact enhancer, solvents, contact cleaner, enhancers, contact lubricant, cramolin, deoxit, progold, CONTACT CLEANER, preservit, cailube mcl, CONTACT CLEANERS, rid-ox,


                      DeoxIT? - Contact Cleaner & Rejuvenator - Brings Old Systems Back to Life!

                      DeoxIT? GOLD (formerly ProGold) - Contact Conditioner & Protector - Maximizes New System Performance!

                      DeoxIT? SHIELD (formerly PreservIT) - Contact Protector - Maintains New System Performance in Severe Environments

                      Comment

                      • Dogma
                        Forum Guru
                        • Sep 2007
                        • 7144
                        • Mason, OH (SW)

                        #12
                        According to the product selection .pdf, regular Deoxit has the most deoxidizing/cleaning properties (whatever 20% properties means).

                        Where do folks get this stuff? What's a good local source? I haven't seen it at AutoZone.
                        Dogma
                        --
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                        Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan

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                        • TheCafeKid

                          #13
                          I was given a tip to brush muriatic acid on the conectors, which will strip all corrosion off and actually will have a bit of a fluxing action and get the corosion that might be on the wire itself going into the connector, then dip it in water to render it innert and then use dielectric grease. This would obviously be easier with the harness out of the bike.... Think I'm gonna give it a shot over the winter.

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                          • posplayr
                            Forum LongTimer
                            GSResource Superstar
                            Past Site Supporter
                            • Dec 2007
                            • 23673
                            • Tucson Az

                            #14
                            Originally posted by TheCafeKid
                            I was given a tip to brush muriatic acid on the conectors, which will strip all corrosion off and actually will have a bit of a fluxing action and get the corosion that might be on the wire itself going into the connector, then dip it in water to render it innert and then use dielectric grease. This would obviously be easier with the harness out of the bike.... Think I'm gonna give it a shot over the winter.
                            Navel jelly will also cut the corrosion as i have mentioned many times. A bit less caustic than muriatic acid. Also washes off with water.

                            Comment

                            • almarconi

                              #15
                              I was given a tip to brush muriatic acid on the conectors, which will strip all corrosion off and actually will have a bit of a fluxing action and get the corosion that might be on the wire itself going into the connector, then dip it in water to render it innert and then use dielectric grease.
                              First off..muriatic acid is the same as hydrochloric acid. Stuff is nasty and highly corrosive. You don't want to put that on your electrical connections. Plain water will not neutralize it, if you must use something, use a solution of baking soda and water. Use a product like DeOxit for cleaning your electrical connections and then some dielectric grease. I don't know who would have given you a tip like that but its simply bad advice.

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