Rostra GlobalCruise, Installation & Owner'S Manual

Page: 18 / 24

I
NSTALLATION
VIII. WIRING ATTACHMENTS TO VEHICLE
Utilize
Figure 34
to make the necessary
wiring harness connections to your vehicle.
CAUTION
Before making any wiring connections, be sure to
disconnect your vehicle’s negative battery cable to
avoid electrical shock and/or damage to the the
vehicle’s electrical system.
A. Black Ground Wire
In order to find a good ground for the cruise system, find a vehicle ground point
which is a clean unpainted metal surface. If the cruise control does not “see” ground
at all times, it will not function.
NOTE:
Do not use the engine as a grounding point. Do not use the cable bracket as a
gounding point.
NOTE:
To find a place to get electrical power you will need to ground one lead of your test
light or volt-ohmmeter. Find electrical ground by turning
ON
the ignition switch
and touching one lead to a “Hot” fused terminal at fuse panel; touch other lead to
unpainted metal part of vehicle. The metal you touch, if it makes continuity,
is ground. The bracket for the parking brake lever is usually a good ground. Turn
the ignition
OFF.
B. Brown Accessory Power
Find a fuse at the fuse panel that supplies power to one of the vehicles accessories.
It should be
+12
volts when the key is
ON
and
zero (0)
volts when the key is
OFF
or
in the
START (CRANK)
position.
C. Red Brake Positive
“Hot” side of brake switch: Use the wire at the brake switch connector with constant
+12
volts
D. Violet Brake Negative
“Cold” side of brake switch: Use the wire at the brake switch connector with
zero (0)
resistance when brake is not pressed, and
+12
volts or open resistance when brake
is pressed.
E. Dark Blue Tachometer (TACH) Wire
The
TACH
function is a safety feature of the
GlobalCruise.
If a vehicle with an automatic transmission is accidentally “knocked” into neutral
while the vehicle is in motion and the
GlobalCruise
is active, the
TACH
wire, when
connected, will disengage the
GlobalCruise
before engine over-rev. If the
TACH
wire
is not “hooked-up”, the cruise control will function; however the
TACH
over-rev
safety feature will be inactive; this is dangerous and not recommended.
ROSTRA
PRECISION CONTROLS, INC.
always recommends the attachment of the
TACH
wire.
On a vehicle with a manual transmission, the
TACH
wire connection is not
required only when
C
LUTCH
D
ISENGAGEMENT
S
WITCH
(Kit# 250-4206)
has been
installed; this will take into acount the
TACH
over-rev safety feature. The
TACH
wire should be grounded when using a clutch disengagement switch to ensure
that the wire does not introduce “trashy” signals into the system.
N
J
M
E
B
K
L
D C
F
A
G
H
Figure 34
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