12 Volt Power Cord:
The optional 12 Volt power adapter for the
ALFA-Club
allows you to power your clock from any 7-16
volt power source. It also provides the attachment point for a sending unit and for a remote hold
switch.
There are 2 connection points on the cable:
1: The DB9 connector which attaches to the ALFA.
2: The Terminal Block which provides screw terminals for easy attachment of the sending unit and
hold switch.
The terminals are as follows:
RED
:
+12 volt power input.
Also the power connection for a sending unit
.
BLACK
:
Ground. This is the common point for power, sender and hold inputs.
GREEN
:
Sending unit pulse input.
BLUE
:
Hold switch input.
Notes:
1: You should keep a battery in your ALFA clock as a power backup in case the 12 volt cord falls out of the lighter plug.
2: It is best to wire the ALFA directly to the battery or fuse box, and not use a lighter cord. Use a lighter cord only for
temporary installations.
3:
The ALFA sending unit will operate from 5-16 volts DC
. If you use another brand sending unit,
make sure it will withstand the 12 volt power source.
4: You can connect the pulse input directly to the pulse output of most car’s Vehicle Speed Sensors (VSS). In this case,
DO NOT connect the 12 volt power to the VSS – it gets its power from the car’s system independently. See
WWW.RALLY.CC for connection details.
NEVER US THE ABS BRAKE SENSOR AS AN ODOMETER INPUT!
5: When using the ALFA-Club or Checkpoint with a sending unit, the clock should be powered from the car’s 12 volt
system. Battery life is limited when running in odometer mode.
ALFA-Club Owners Manual
9
