Crutchfield Metra 70-1786 Owner's manual

Brand: Crutchfield

Model: Metra 70-1786

Type: Owner's manual

Crutchfield Metra 70-1786 is a receiver wiring adaptor designed to connect a new receiver to a factory radio harness in select Mercedes vehicles. It enables the new receiver to work with the vehicle's existing wiring system, including power, ground, speakers, and illumination. The adaptor also provides an amplifier turn-on wire to allow the new receiver to control an external amplifier. With this adaptor, you can easily and safely install a new receiver in your Mercedes vehicle without cutting or splicing factory wires.

Crutchfield Metra 70-1786 is a receiver wiring adaptor designed to connect a new receiver to a factory radio harness in select Mercedes vehicles. It enables the new receiver to work with the vehicle's existing wiring system, including power, ground, speakers, and illumination. The adaptor also provides an amplifier turn-on wire to allow the new receiver to control an external amplifier. With this adaptor, you can easily and safely install a new receiver in your Mercedes vehicle without cutting or splicing factory wires.

Receiver Wiring Adaptor

120 70-1786

Revision 06/08/20

STEP 1 -- MATCH & CONNECT WIRES

*120701786*

IMPORTANT

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.

Copyright 2020 Crutchfield Corporation

Connect to RCA outputs on receiver

Yellow - 12 Volts Constant Power

Red - 12 Volts Switched Power

White - Left Front Channel

Violet - Right Rear Channel

Green - Left Rear Channel

Gray - Right Front Channel

Black - Chassis Ground

Orange/White - Illumination

Blue/White - Amplifier Turn-On

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.

Individually tape off any unused wires.

Make final wiring connections following instructions on the next page.

A.

B.

C.

1999-'03 Mercedes E-Class may not have a match for this wire. If

not, splice the Red wire from the receiver to the Black/Yellow wire

at the factory cigarette lighter.

1998-'00 Mercedes ML-Class vehicles only:

The wire that lines up with this slot must be

spliced into the antenna/amp remote wire

on the receiver wiring harness.

120 70-1786

Page 2

STEP 2 -- CONTINUED

A. Strip wires back 1/2”.

B. Twist wires together and

insert in crimp cap.

C. Squeeze middle of cap

for tight connection.

Copyright 2020 Crutchfield Corporation

STEP 3 -- APPLICATION

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.

STEP 2 -- CRIMP CONNECTIONS

Tools & Parts

Required4

Wire Stripper/Crimp Tool Crimp Caps

Unused Wire (tape over bare wires)

Receiver Wiring Adaptor

Generic Illustration

Generic Illustration

Receiver Wiring Adaptor Connections

A. 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.

1
2

Crutchfield Metra 70-1786 Owner's manual

Brand: Crutchfield

Model: Metra 70-1786

Type: Owner's manual

Crutchfield Metra 70-1786 is a receiver wiring adaptor designed to connect a new receiver to a factory radio harness in select Mercedes vehicles. It enables the new receiver to work with the vehicle's existing wiring system, including power, ground, speakers, and illumination. The adaptor also provides an amplifier turn-on wire to allow the new receiver to control an external amplifier. With this adaptor, you can easily and safely install a new receiver in your Mercedes vehicle without cutting or splicing factory wires.

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