Charging issues on a 72 Bonnie T120

Discussion in 'Bonneville' started by rich, Sep 17, 2014.

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  1. rich

    rich Member

    Sep 17, 2014
    10
    8
    Mansfield, Nottinghamshire, UK
    #1 rich, Sep 17, 2014
    Hi Guys!

    My '72 T120V doesn't seem to be charging very well. It is fitted with the bridge rectifier and zener diode and batt voltage struggles to reach 12.8v, even when revved hard. The rectifier has been tested and is working correctly. Unplugging the zener seems to make no difference. The alternator open circuit voltage is about 30v AC when revved. Is this normal? Any advice is greatly appreciated! Cheers, Rich
     
Loading...
Similar Threads - Charging issues Bonnie
  1. deaks25

    05 Sprint St Charging Issues

    deaks25, May 21, 2018, in forum: Technical Help
    Replies:
    11
    Views:
    5,010
    t552
    May 22, 2018
  2. Tigcraft

    iPhone charging issues from bike power source

    Tigcraft, Aug 1, 2016, in forum: Technical Help
    Replies:
    6
    Views:
    1,642
    crispey
    Aug 2, 2016
  3. Junglie25

    Sunday Stupid Question - Charging

    Junglie25, Jan 18, 2026, in forum: Speed Triple
    Replies:
    7
    Views:
    518
    Junglie25
    Jan 19, 2026
  4. Scoot65

    Optimate Constant Charging Current Amperage Question

    Scoot65, Jan 9, 2026, in forum: Triumph General Discussion
    Replies:
    18
    Views:
    1,061
    Baza
    Jan 14, 2026
  5. DGMCustoms89

    2007 Speed Triple 1050 Charging Issue

    DGMCustoms89, Sep 5, 2025, in forum: Technical Help
    Replies:
    2
    Views:
    771
    DGMCustoms89
    Sep 9, 2025

Share This Page

Sign up