INSTALLATION INSTRUCTIONS FOR PART 87-99-3052
APPLICATIONS
CHEVROLET
Blazer 1973-1987
Pickup 1973-1987
GMC
Pickup 1973-1987
Suburban 1973-1987
87-99-3052
KIT FEATURES
• Shaft and DIN Unit Provisions
KIT COMPONENTS
A) Faceplate • B) Radio Housing
A
B
TOOLS REQUIRED:
• Phillips Screwdriver • Adjustable Wrench
1-800-221-0932
© COPYRIGHT 2001-2008 METRA ELECTRONICS CORPORATION
87-99-3052 DASH DISASSEMBLY/
KIT ASSEMBLY/FINAL ASSEMBLY
ALL VEHICLES
Chevrolet
-
Blazer 1973-1987, Pickup 1973-1987
GMC - Pickup 1973-1987, Suburban 1973-1987
1
Disconnect the negative battery terminal to prevent an accidental short circuit.
Remove (4) Phillips screws from the lower steering column panel and remove the
panel. Remove (8) Phillips screws from the perimeter of the dash trim bezel and
remove the bezel. Remove (3) Phillips screws securing the factory head unit and
disconnect the wiring.
SHAFT HEAD UNITS: Position the Faceplate against the face of the radio trim
bezel and slide it to the right until the right edge of the Faceplate meets the lip of
the bezel. (see Fig. A). Slide the aftermarket head unit through the sub-dash, dash
trim bezel and Faceplate and secure with shaft nuts. (see Fig. B). Skip to Final
assembly.
Fig. B
Fig. A
1
87-99-3052
KIT ASSEMBLY/FINAL ASSEMBLY
ALL VEHICLES
Chevrolet
-
Blazer 1973-1987, Pickup 1973-1987
GMC - Pickup 1973-1987, Suburban 1973-1987
1
DIN HEAD UNITS: Mount the Radio Housing to the sub-dash with (3) Phillips screws
previously removed in step #1. (see Fig. A). Scribe the DIN radio opening onto the
sub-dash metal, remove the Housing and cut the sub-dash along the scribed line.
(see Fig. B). Place the Housing between the dash trim bezel and sub-dash and
secure with the same (3) Phillips screws. (see Fig. C). Cut and remove the shaft
supports from the Faceplate. Place the Faceplate against the face of the radio trim
bezel and slide it to the right until the right edge of the Faceplate meets the lip of
the bezel. (see Fig. D). Slide the DIN cage through the radio opening and secure by
bending the metal locking tabs down. Slide the aftermarket head unit into the cage
(see Fig. E) until secure.
Fig. A
Fig. B
Fig. C
Fig. E
Fig. D
2
87-99-3052 FINAL ASSEMBLY
FINAL ASSEMBLY
A
B
(A) Strip wire ends back 1/2"
B) Twist ends together
C) Solder
D) Tape
C
D
Locate the factory wiring harness in the dash. Metra recommends using the
proper mating adapter and making connections as shown. (Isolate and individ-
ually tape off the ends of any unused wires to prevent electrical short circuit.)
1
2
3
Re-connect the negative battery terminal and test the unit for proper operation.
Reassemble radio and dash assemblies in reverse order of disassembly.
FINAL WIRING CONNECTIONS
Make wiring connections using the EIA color code chart shown below and the instructions included with the
head unit. Metra recommends making connections as shown below; Strip, Splice, Solder, Tape. Isolate and
individually tape off ends of any unused wires to prevent electrical short circuit.
METRA / EIA WIRING CODE
12V Ignition / Acc. . . . . . . . . . Red
Right Front (+) . . . . . . . . . . . . Gray
12V Batt / Memory. . . . . . . . . Yellow
Ground. . . . . . . . . . . . . . . . . . Black*
Power Antenna. . . . . . . . . . . . Blue
Right Front (-). . . . . . . . . . . . . Gray/ Black
Left Front (+) . . . . . . . . . . . . . White
Left Front (-). . . . . . . . . . . . . . White / Black
Right Rear (+) . . . . . . . . . . . . Violet
Amp Turn-On . . . . . . . . . . . . . Blue / White
Amp Ground. . . . . . . . . . . . . . Black / White
Illumination . . . . . . . . . . . . . . Orange
Dimmer . . . . . . . . . . . . . . . . . Orange / White
Right Rear (-) . . . . . . . . . . . . . Violet / Black
Left Rear (+) . . . . . . . . . . . . . Green
Left Rear (-) . . . . . . . . . . . . . . Green / Black
*NOTE: When a Black wire is not present, ground radio to vehicle chassis.
All colors may not be present on all leads due to manufacturer’s specifications.
3
87-99-3052
KIT ASSEMBLY/FINAL ASSEMBLY
ALL VEHICLES
Chevrolet
-
Blazer 1973-1987, Pickup 1973-1987
GMC - Pickup 1973-1987, Suburban 1973-1987
Re-connect the battery terminal and test the unit for proper operation. Locate the rear
support provision in the sub-dash ("A").
Using a perforated support strap, mount the back of the unit tosub-dash. the rear sup-
port location in the sub-dash.
4
87-99-3052
NOTES
5
87-99-3052 INSTRUCTIONS
1-800-221-0932
REV. 11/06/08 © COPYRIGHT 2001-2008 METRA ELECTRONICS CORPORATION INST87-99-3052
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