70-1721 - Uncategorized Metra - Free user manual and instructions

Product Type	Receiver Wiring Adaptor
Brand	Metra
Model	70-1721
Compatibility	Aftermarket receivers and select factory harnesses
Number of Wires	12
Power Supply	12V DC (Constant and Switched)
Illumination Wire	Orange (if receiver supports)
Remote Turn-On	Blue wire (Power Antenna/Amplifier Remote)
Speaker Channels	4 (Front Left/Right, Rear Left/Right)
Ground Wire	Black
Connector Type	Crimp caps included
Installation Method	Strip, twist, crimp
Material	PVC wires, metal terminals
Wire Color Code	Standard aftermarket color coding
Dimensions (Approx.)	6 x 3 x 1 inches
Weight (Approx.)	0.2 lbs
Included Accessories	Wiring adaptor, crimp caps, user manual
Safety Instructions	Disconnect battery before installation
Maintenance	Keep dry, clean with dry cloth
Repairability	No user-serviceable parts; replace entire unit if defective

Frequently Asked Questions - 70-1721 Metra

What is the Metra 70-1721?

The Metra 70-1721 is a receiver wiring adaptor designed to connect an aftermarket car stereo to the vehicle's factory wiring harness, simplifying installation.

Which vehicles are compatible with the 70-1721?

The 70-1721 is compatible with a specific set of vehicles. Check the manufacturer's compatibility chart or Crutchfield's vehicle selector to confirm fitment for your car.

Do I need to cut any factory wires?

No, the adaptor is designed for a plug-and-play installation. It connects directly to the factory harness using crimp caps provided, so no cutting of original wires is required.

What is the orange wire for?

The orange wire is for illumination control. If your aftermarket receiver lacks an illumination wire, cap off the orange wire with electrical tape to prevent short circuits.

How do I install the Metra 70-1721?

Installation involves matching wires by function (not color), stripping the ends, twisting together, and crimping with the included caps. Then plug the adaptor into the vehicle's factory harness.

Can I use the 70-1721 with any aftermarket receiver?

Yes, as long as the aftermarket receiver has the standard wire functions (power, ground, speakers, etc.). Match wires by function—the adaptor's wire color may differ from your receiver's.

What tools are needed for installation?

You will need a wire stripper and a crimp tool. The crimp caps are included in the package.

Is the 70-1721 vehicle-specific?

Yes, it is designed for specific vehicle applications. It matches the factory harness connector of certain makes and models. Verify compatibility before purchase.

What if my receiver has different wire colors?

Ignore the colors; match wires by function (e.g., left front positive, right rear negative). The manual provides a function list for each adaptor wire.

How should I handle unused wires from the adaptor?

Tape off any unused wires with electrical tape to prevent them from touching metal or other wires, which could cause short circuits or damage.

USER MANUAL 70-1721 Metra

Receiver Wiring Adaptor

IMPORTANT

120 70-1721

Before starting, compare items on your invoice with items received. Thoroughly check packing materials. If an item is missing, please call Crutchfield at 1-888-955-6000.

Revision 10/07/13

STEP 1 -- MATCH & CONNECT WIRES

A. Match wires below to the matching function of each wire on your receiver (refer to instructions supplied with receiver). The wire colors of your new receiver may, or may not, match the wire colors of the adaptor. Match adaptor and receiver wires by function, disregarding color.
B. If your receiver does not have an Illumination wire, tape off the Orange wire.
C. Individually tape off any unused wires.
D. Make final wiring connections following instructions on the next page.

Blue - Power Antenna or Amplifier Remote Red - 12 Volts Switched Power Violet - Right Rear Speaker Positive Green - Left Rear Speaker Positive Gray - Right Front Speaker Positive White - Left Front Speaker Positive Orange - Illumination Yellow - 12 Volts Constant Power Violet/Black - Right Rear Speaker Negative Green/Black - Left Rear Speaker Negative Gray/Black - Right Front Speaker Negative White/Black - Left Front Speaker Negative Black - Chassis Ground

CRUTCHFIELD

Copyright 2013 Crutchfield Corporation

*120701721*

Receiver Wiring Adaptor Connections

120 70-1721

STEP 2 -- CRIMP CONNECTIONS

Tools & Parts Required ▶

Wire Stripper/Crimp Tool Crimp Caps

A. Strip wires back 1/2".

Line drawing of a mechanical component with internal gear-like structure and cutting edge (no text or symbols)

B. Twist wires together and insert in crimp cap.

Diagram showing a cable being inserted into a plug, with no text or symbols present.

C. Squeeze middle of cap for tight connection.

middle of cap ection.

STEP 2 -- CONTINUED

D. Complete crimp connections for all necessary wires.
E. Be sure to wrap any wires from the Wiring Adaptor that are not necessary (wires with no match from the new receiver) with electrical tape.

Receiver Wiring Adaptor

Generic Illustration

Unused Wire (tape over bare wires)

STEP 3 -- APPLICATION

When ready to install the receiver, plug the Wiring Adaptor from the new receiver or receiver assembly into the factory radio harness(es) in the vehicle dash.

to install the receiver, plug aptor from the new receiver sembly into the factory (es) in the vehicle dash.

Generic Illustration

CRUTCHFIELD

Copyright 2013 Crutchfield Corporation