Hawk HA-FM11, Manual

Page: 7 / 40

Finding the wires you need
Now that you have decided where each component will be located, you’re
going to find the wires in the car that the security system will be connected to:
IMPORTANT: do not use a 12v test light to find these wires! Use a
digital multi meter for all testing.
Obtaining constant 12v
We recommend two possible sources for 12v constant: the (+) terminal of the
battery, or the constant supply to the ignition switch. Always install a fuse
within 12 inches of this connection. If the fuse also will be powering other
circuits, such as door locks, a power window module, headlight control system
etc, fuse accordingly.
Finding the 12v switched ignition wire
The ignition wire is powered when the key is in the run or start position. This is
because the ignition wire powers the ignition system (spark plugs coil) as well
as the fuel delivery system (fuel pump, fuel injection computer). Accessory
wires lose power when the key is in the start position to make current available
to the starter motor.
How to find (+) 12v ignition (ACC) with your multi meter:
1. Set to DCV or Dc voltage (12v or 20v is fine).
2. Attach the (-) probe of the meter to chassis ground.
3. Probe the wire you suspect of being the ignition wire. The steering column
harness or ignition switch harness is an excellent place to find this wire.
4. Turn the ignition key switch to the run position. If your meter reads (+)
12v, go to the next step. If it doesn’t, probe another wire.
5. Now turn the key to the start position. The meter display should stay
steady, not dropping more than a few tenths of a volt. If it drops close to or
all the way to zero, go back to Step 3. If it stays steady at (+) 12v, you have
found an ignition wire.
HA-FM11 manualv3_p1-20_Layout 1 15/08/2016 18:40 Page 7