Metra Electronics Automobile Accessories 87 99 3052 User Manual

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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