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Black Widow BW 2850 Installation Manual page 8

3 channel systems

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15. Connect 12V+ Power Input
: Red wire on main harness
Connect the red fused wire on the main
harness to a constant 12V+ source.
This source wire should be at least 20
amp supply.There usually is a main con-
stant power wire on the ignition switch.
Use volt/ohm meter to verify.
16. Connect the 12V+ ignition
input: Yellow wire on main
harness
Connect the yellow wire on the main
harness to a main ignition wire.This can
be also found in the main ignition switch
wire harness.Your volt/ohm meter will
read 12V+ when key is turned on.
Make sure that this ignition wire has
12V+ on even during the starting process
of the vehicle. It is important that the
voltage does not drop when the car is
starting.
Some vehicles have ignition wires that
remain or slowly drop to 0 volts.Verify
that when the ignition is shut off that the
voltage drops to 0 Volts immediately. If
the yellow wire has voltage on it after the
key is turned off, it will keep the alarm
from arming via the remote.
17. Connect Ground Input:
Black wire on main harness
Locate a good solid chassis ground and
connect to the black wire on main har-
ness.Verify the ground with your
volt/ohm meter.
18. Connect optional third
channel output: White/Red
wire on main harness
Connect the white/red wire on main har-
ness to an optional relay or accessory
module to control via the 3rd channel.
Ideal for window roll up or remote start.
To use this feature press both buttons
1&2 on 2 button remote control, or
Button # 3 on 3 button remote. NOTE:
This output will work with the ignition on
or off and will provide output on the
white/red wire as long as you hold proper
transmitter buttons.
19. Connect the door lock
wires: Blue and Green on 5 pin
harness.
For Module without on board door
lock/unlock relays:
The blue wire provides a 500 ma negative
pulsed output for unlock, this output is
designed to drive a relay (See diagram
section).
The green wire provides a 500 ma nega-
tive pulsed output for lock, this output is
designed to drive a relay (See diagram
section).
The Violet, Brown and White wires do
not need to be connected on the 3 chan-
nel module without on board relays for
door locks.
For Module with on board door
lock/unlock relays:
Connect the violet wire to the proper
polarity (negative or positive).
8

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