hall effect and coil driver

Discussion in 'The Projects Forum' started by dodgyboots, Jan 3, 2013.

  1. dodgyboots

    Thread Starter New Member

    Jan 3, 2013
    hi , i would like to replace the points on my 1929 vtwin harley davidson that i have just got running after 23 years , i would like to keep the original coil , i expect the condenser would be needed as well , i cant find anyone who makes a kit for my model so i would like to try to build my own , the existing system has a simple distributor shaft with a cam shape pushing a single set of points which open the points twice every rev at 0 degrees and again at 315 degrees of crank angle , this inturn cuts the circuit to the twin coil , the condenser is connected in the normal way accross the points.
    so both plugs get a hit twice on each rev, one on power stroke and one on exhaust stroke , so the leads go straight from coil to plug not through distributor,
    so to remove the points and fit a hall effect sensor is where i am going out of my field a bit , i am a rig electrician so i have some basic understanding ,but electronics is very hard for me ,
    so correct me if i am wrong ,
    if i have a hall effect sensor mounted and trigger points sorted , would the next part be to have the trigger wire from the sensor to drive a transistor type switch which would switch the coil /condenser .
    if yes what type could handle the high back emf at this point without causing damage to switch?
    a brand and part number for hallefect sensor and switch would be great ,
    thanks to any positive help ,shane
  2. spankey666


    Nov 30, 2011
    fit an ordinary induction pickup and use a zeeltronic ignition box. this is how i have done hundreds of retrofit systems. you wont get much help on here as automotive questions are banned :(
  3. shortbus

    AAC Fanatic!

    Sep 30, 2009
    I put one of the circuits from this guy on my 1957 FLH and it works perfect. http://www.5bears.com/tim4.htm Don't remember which one though, it was about 15 years ago.
    dodgyboots likes this.
  4. dodgyboots

    Thread Starter New Member

    Jan 3, 2013
    thanks i will give it a try