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Thread: Diode board replacement

  1. #1

    Diode board replacement

    I need to replace my 1973 R60/5's diode board. There are a number of them for sale through eBay from salvage companies but I am wondering how do you know it will work? Euroelectric has a diode board replacement but it doesn't list the Bosch part number on it. Can anyone recommend a source for diode boards?
    Thanks ,
    Debbie

  2. #2
    Quote Originally Posted by wilddeb View Post
    I need to replace my 1973 R60/5's diode board. There are a number of them for sale through eBay from salvage companies but I am wondering how do you know it will work? Euroelectric has a diode board replacement but it doesn't list the Bosch part number on it. Can anyone recommend a source for diode boards?
    Thanks ,
    Debbie
    Rick Jones at Motorrad Elektrik.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  3. #3
    Macrunch MCrenshaw's Avatar
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    The phrase 'caveat emptor' (buyer beware) comes to mind when buying used electrical parts. Bite the bullet and buy new if you can. As Mr. Glaves says Rick Jones is an excellent source. I have also bought a Thunderchild diode board and am quite happy with the part and service.

  4. #4
    If I were needing a diode board I would get a Thunderchild or Omega board. If you do end up using a bosch diode board (OEM), I would take some steps to ensure a good ground. The most effective grounding method that I've seen was performed on a buddy's bike at the 98 CASS Rally in WVa. This modification was done by someone having a shop somewhere in WV (don't recall where or who) and the demonstration was done on a rainy Saturday under a covered picnic area. My buddy's bike had the charging light come on while we were enroute to the rally and investigation at the rally showed his diode board as failed. [The board had corrosion about the brass mount points and it was apparent by the melted solder that his board had gotten quite hot.] Fortunately, someone at the rally had a spare diode board to "loan" to my buddy.

    Attached is a photo showing the addition of the supplemental ground wire and another photo showing how the supplemental wire was attached to the bike. Links for Thunderchild and Omega diode boards follow -

    http://www.thunderchild-design.com/homepage.html

    http://www.motoelekt.com/charging.htm
    Attached Images Attached Images

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