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49-840in.fm Page 11 Thursday, August 19, 1999 10:47 AM
FINDING CONSTANT
AND IGNITION POWER
Your system operates from 12 volts
and draws up to 15 amps of current.
In addition to constant 12 volts, the
system needs a source of power that
is on only when the ignition is on
(usually referred to as ignition power).
Follow these steps to find constant
and ignition power.
1. Locate the wire bundle going to
your vehicle's ignition switch.
2. There is a large red or striped red
wire going to your ignition switch.
With the ignition switch in the
OFF position, touch one lead
from a 12-volt test light or volt
meter to a metal part of your vehi-
cle. Use the other lead with a
wire-piercing probe to probe the
wire. Confirm that the light turns
on or the meter indicates 12 volts.
3. Mark this wire with its function
(CONSTANT POWER).
4. Turn the ignition to ON. Probe for
a wire under the dash that has
12 volts only when the ignition is
on. Confirm this by turning the
ignition on and off while probing
each wire.
5. Mark this wire with its function
(IGNITION POWER).
USING WIRE TAP-INS
We recommend you use wire tap-ins
to make all connections.
Notes:
• Because of the extreme tempera-
tures that occur inside a vehicle,
we recommend you never use
black electrical tape to insulate a
connection.
• If you choose to solder connec-
tions, use heat-shrink tubing to
insulate the connections.
• Do not strip either wire when
using a wire tap-in.
1. Snap the tap-in's grooved chan-
nel over one of the wires.
2. Put the other wire in the other
channel.
Need Help? Call 1-800-598-2527
11
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