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  3. Metra 70-1786
Metra 70-1786

Crutchfield Metra 70-1786 Owner's manual

  • Hello! I've reviewed the user manual for the Crutchfield Wiring Adaptor 70-1786. This document provides instructions on how to properly match and connect the wires of the adapter to your new receiver, and gives special instructions for 1998-2000 Mercedes ML-Class and 1999-2003 Mercedes E-Class vehicles. I'm here to help you understand the instructions and answer any questions you might have about the wiring process. Feel free to ask!
  • What should I do before starting the installation?
    How should I match the wires?
    What should I do with unused 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.
/