78 GS750 Dead Electrics Help

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  • Carlo
    • Mar 2026
    #1

    78 GS750 Dead Electrics Help

    Hello all,

    I've been trying to help a friend who bought this old ride get it going again. Charged battery, drained fuel, added fresh fuel and cleaned plugs. Had spark and gas, so I thought I would start it.

    The problem at the moment is dead electrics - every bit. Got the bike running and went for a (close to home) spin. It ran ok but then 2 cylinders cut out. I parked it for a day, and then nothing. No lights, horn, signal, or even speedo/tach lights. Battery is good, main fuse good, and ground to engine good. I originally thought it was a single bad coil but I don't think that could kill everything. Now I am wondering if it's a a voltage regulator.

    Any help would be most appreciated. If I can get this old customized ride rolling, I'd like to spend some hours in the saddle again.

    All the best,
    Carlo
    Tags: None
    • tom203
      Forum Guru
      Past Site Supporter
      • Aug 2010
      • 8925
      • Norway,Maine
      #2
      Before you can get back in saddle, you'd got some work to do- overdue/neglected maintenance. If you head to this link, owners manuals and electrical schematics pop up. lots of info

      http://members.dslextreme.com/users/bikecliff


      Since it ran and then cut out, your charging system is a prime suspect. Get a multimeter if you don't already.
      1981 gs650L

      "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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        • BassCliff
          #3
          Hi,

          There is no quick-fix silver bullet for these old bikes. They need love, lots of love.

          If you are here you probably have a 30 year old motorcycle that needs about 20 years worth of maintenance. In the links below you'll find maintenance lists, documentation, wiring diagrams, "how to" guides, vendor links, tips, tricks, and a whole lot of GS goodness. This is your "mega-welcome". Let's get started.

          Let me dump a TON of information on you and share some GS lovin'.

          I just stopped by to welcome you to the forum in my own, special way.

          If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

          Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



          Please Click Here For Your Mega-Welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

          More links to helpful threads in the forum:
          Help! Your Bike Won't Start
          DON'T DO THESE THINGS
          Help! Your Bike Won't Run Well
          Oh God! Pods!


          Thanks for joining us. Keep us informed.

          Thank you for your indulgence,

          BassCliff

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