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electrical failure. any tips?

Discussion in 'Small Block' started by redwitch, May 18, 2020.

  1. redwitch

    redwitch Tuned and Synch'ed

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    hi everybody.
    I'm in trouble! On my V75, after a battery change, the 3rd fuse blew on first try. The starter worked, but no ignition. Changed fuse, it started OK, but after one minute, stopped again, and this time, nothing left: no starter, no ignition .
    There' is probably a short somewhere, but I don't know where to start... Anybody had the same type of trouble? Thanks for any idea, I am not very "electric minded..."
     
  2. Kevin.NZ

    Kevin.NZ Cruisin' Guzzisti

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    1st thing i would check would be a fully charged battery, then cables to battery terminals and earths, then using a volt meter check every fuse, both sides .
     
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  3. redwitch

    redwitch Tuned and Synch'ed

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    thank you for this fast answer. I am going to try this first.
     
  4. Chris UK

    Chris UK Just got it firing! GT Contributor

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    Quite often a bad (corroded) earth terminals can cause stuff like that.
     
  5. redwitch

    redwitch Tuned and Synch'ed

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    thanks. I check every possible cause, one by one, and there are many wires to check!
     
  6. Kevin.NZ

    Kevin.NZ Cruisin' Guzzisti

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    pull connectors apart and spray with a contact cleaner, check the simple things 1st.
     
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  7. Chris UK

    Chris UK Just got it firing! GT Contributor

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    You do not have to check them all, the important ones, as Kevin NZ said above, are the battery terminals (both +ve and -ve especially look at both ends of the -ve cable) and the earth wires (usually black and attached to the frame/engine/gearbox/headlamp shell/rear mudguard etc.) If you are not sure what we are describing they may be called ground not earth. Look at Carl Allison's wiring diagram here http://www.thisoldtractor.com/guzzi007/schematics/1977_V35III_V75.gif (I'm not sure if this is the correct model as you do not specify.

    I hope this helps
     

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