Actron CP7955 - Manual (Page 3)

2
3. Dimmer Control.
For dash lighting dimmers that control the
positive side (Diagram 2A) of the lighting cir-
cuit:
- For Two-wire Bulb Holder -
Connect the red wire into the circuit between the
dimmer control and the dash lights. Connect the
black wire to a good electrical ground.
- For One-wire Bulb Holder -
Connect the one wire into the circuit between
the dimmer control and the dash lights. Obtain a
length of 18-gauge insulated copper wire and
connect one end of the wire to a good electrical
ground source and the other end to one of the
mounting bracket posts.
For dash lighting dimmers that control the
grounded side (Diagram 2B) of the lighting cir-
cuit:
- For Two-wire Bulb Holder -
Connect the black wire into the circuit between
the dimmer control and the dash lights. Connect
the red wire to the fuse box so that the wire only
receives +12-volt power when the dash lights are
turned on.
- For One-wire Bulb Holder -
Connect the wire to the fuse box so it receives
only +12-volt power when the dash lights are on.
Obtain a length of 18-gauge insulated copper wire
and connect one end to the gauge mounting
bracket or panel. Connect the other end of the
wire into the circuit between the dimmer control
and the dash lights. Insulate the gauge and
bracket from grounded surfaces.
4. Refer to specific instructions for the gauge
you are installing. They explain other con-
nections that should be made before mount-
ing is completed.
5. Insert the gauge into the mounting panel or
hole.
6. Insert the bulb holder into the bulb socket on
the back of the gauge.
7. Install the appropriate mounting bracket (Dia-
gram 1: insulated or non-insulated) over the
mounting posts (Diagram 3), slide on washer,
plus a lock washer if supplied, and tighten
the nut with only light pressure. If the gauge
is an electrical model, be sure you use a
bracket that has grommets to insulate the
posts from the mounting bracket. This does
not apply to gauges using separate bracket
mounting posts from the posts used for wire
connections.
8. Position the gauge for best visibility and ap-
pearance, then tighten the bracket nuts with
moderate pressure. Do not over- tighten these
nuts when using an insulated bracket. Ex-
cess pressure can distort the grommets caus-
ing them to crack and short the wiring, even
months after installation.
9. Refer to the specific instructions for the gauge
you are now installing to complete any other
connections.
Diagram 2B
For Ground Dimmer Controls
GAUGE
DASH LIGHTING
GROUND
+12 VOLTS
DIMMER
CONTROL
+12 VOLTS
RED
BLACK/GROUND
Diagram 2A
For Positive Dimmer Controls
GROUND
DIMMER
CONTROL
RED
+12 VOLTS
DASH LIGHTING
GROUND
GAUGE
BLACK/
GROUND
NUTS &
WASHERS
INSULATED
U-BRACKET
DASHBOARD
LIGHT
GAUGE
U-BRACKET
LIGHT
NUTS &
WASHERS
GAUGE
Diagram 3
Electrical Gauges Shown