1977 BMW 630csi: H&B
Archive for October, 2013

AUX. fan interrupt switch

the haltech ems will be controlling my AUX. cooling fan, since i deleted the mechanical clutch fan. here are a few shots of the wiring and switch. the led indicator gave me a fit acting as a diode while the switch was wired to the negative. a little tweaking gave me the following:

  • switch:
    1. Blk wire = ground
    2. grey/red = signal plus jumper to Negative side of led
  • led:
    1. white = jumper mentioned above.
    2. orange = 12v on or acc. wirephoto