Original Wiring and Connection of Classic Car Units
How to Determine Which Wires Connect to What

EQUIPMENT REQUIRED:  12 volt power supply, volt-ohmmeter, DC ammeter and 2 test speakers

1.  Connect negative ohmmeter lead AND power supply negative lead to unit chassis (ground).
Also connect the (-) lead of both test speakers to the unit chassis.

2.  Set ohmmeter to R x 100K range or higher.

3.  Turn radio on and off repeatedly (or insert and remove a tape if an 8 track-only unit) while touching
the positive ohmmeter lead to each terminal (or wire).  When the resistance suddenly goes very low,
you have found the wire for +12 volts to the unit.

NOTE:  If unit is a Delco 8 track player only, there are TWO wires that will drop the resistance.  The
correct  wire is the one that causes the unit to draw LESS THAN 5 AMPS when powered up.

4.  If a Delco 8 track player, note which two wires drop the resistance.   Connect the positive power
supply lead to these wires one at a time, turn on power supply and insert a tape.  Identify the wire
causing unit to draw LESS THAN 3 AMPS as the +12 volt power wire to the unit.     

5.  With the unit powered up and running, touch the (+) left speaker wire to each unit terminal until
you hear music.  Rotate the balance control to determine which (+) speaker wire you have identified,
then label that wire accordingly.  If front and rear equipped, repeat step to identify these wires also.

6.  Repeat step 5 for the right speaker (+) wire.

7.  Remove the tape, then use a voltmeter to determine which wire sends power to the radio when
tape is removed.  Identify this wire as "Power to radio".

8.  Reduce power supply voltage to 3 to 6 volts.  Remove power supply positive wire from the unit's
wire or connector, then touch it to the remaining wires or terminals.  When you hear a click from
the left speaker, you have found the left "To Radio Left Output" wire.

9.  Repeat step 8 for the right side.

10.  If unit is equipped with a power antenna wire, it will have +12 volts on it with radio turned ON only.

This Completes Wiring Identification on "Any Type" of Unit
Any Type of Radio, 8 Track or Radio-8 Track Unit:
Aftermarket Units - Kraco, Sparkomatic, Clarion and No-Name Brands

Smaller units with the familar 4 pin connector (or wires) generally follow the semi-universal color code:

Red ------  +12 volts          Black ----- Common         Green - Left Speaker       Grey - Right Speaker

Note:  To make your own connector, solder wires to short pieces of  #12 Romex construction wire - insert Romex pieces into connector.

Important Note on all Delco Standalone 8 Track Players

Chevy, Buick and Pontiac units use an identical 8 pin connector.  However, they are not wired the same
internally.  Plugging a Chevy unit into a Buick will likely blow a fuse and could damage the unit.  The
buyer should make sure that the unit purchased is the correct unit for the car it will be installed into.
Note that even some '70 Pontiac units WON'T work in a '69 GTO and will damage the amplifier.

PLEASE NOTE:  As the speaker and power switching between a Delco 8 track and radio actually takes
place inside the 8 track unit, the radio will not operate until the 8 track unit is reinstalled.
Wiring Identification For a FORD Radio - 8 Track Unit

CAUTION:  Ensure you have the EXACT model
number for your car or it will likely burn things up.
This type of damage is NOT covered by warranty.
Please let us know if yours isn't the exact model
and we will label all wires for safe installation.
OLDSMOBILE 8 Track Players - Wiring Color Code (Connectors cut)
+12 volts to 8 track unit = Solid yellow
Left speaker = Green with black stripe
Right speaker - Black with white stripe
Power to radio = Yellow with black stripe
Left radio output = Solid green
Right radio output = Dark blue
Mono radio output (if used) = Light blue
NOTE:  These instructions are provided as a free courtesy.  If more guidance is needed, a local technician may
need to be hired.  I assume ZERO liability or responsibility for errors or damage resulting from improper hookup.
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Unit Wiring - Converted Radio
Unless otherwise requested, your converted radio will have a 12-wire harness in place of the original connectors.  In the diagrams
below, only the speaker wiring is shown for simplicity.  The power, ground and dial lighting connections are as follows:

Red = 12 volts             Orange = Dial lighting           Black = Ground             Blue = Power antenna
Speaker Wiring
Any number of speakers from one to four may be connected, and the conversion module will detect the number of connected speakers
and automatically adjust its behavior and available features depending on how many speakers are being used.  This ability is especially
useful in cases where the owner wants to "cruise" with 4 speakers, but also be able to remove any added speakers for car shows.  The
conversion module will, for instance, enable the virtual fader function for 4 speakers and disable that function when using 2 speakers.

For 3-speaker systems such as Chrysler cars which have 2 rear speakers and a single center dash speaker, the center speaker can be
wired to reproduce the left signal, right signal OR a mono signal - with the rear speakers still retaining their left-right separation.  Note
that when wiring your speakers for maximum audio power (fully isolated, no common ground), external faders MUST not be used since
these controls were designed to work with a common ground system and cannot handle the power of a fully isolated speaker system.
Maximum Audio Power - Fully Isolated, Non Grounded Speaker System
Common Ground Speaker System - Power Output Roughly Equal to Original Radio
NOTE:  Capacitors shown are required for isolation.  Use value from 1000 to 3300 uF,  ELECTROLYTIC ONLY
NOTE:  If you requested that I wire the conversion to your original connectors, the output capacitors are already
installed inside the unit.  In this case, there will only be two or four speaker connections depending on system.
3-Speaker Isolated, Non-Grounded System (Center Speaker Produces MONO Signal)
NOTE:  Tape
off any wires
not being
NOTE:  Tape
off any wires
not being
NOTE:  If a DELCO radio has the connector
shown below, your speakers are already
fully isolated and there is NO need to run
new speaker wiring for maximum output.
However, speakers must be upgraded to
handle 30 watts RMS (or 60 watts "peak").
(Broken lines are wires with black stripe)
NOTE for Chrysler systems which have an external front-rear fader, crossover or mixer boxes:
Only if your ORIGINAL CONNECTORS were used, these external items will still be operational.
NOTE:  In the case of Delco systems which originally employed a multiplex adaptor with a
mono FM radio:  All speaker outputs now come from the RADIO, and the MPX adaptor is no
longer used.  Thus, it is necessary to rewire the system which may require a local technician.
Instructing the customer to do this is beyond my scope of services and could result in damage.
(Someone capable of performing such rewiring SAFELY will not require additional guidance)
Converted 8 Track Player - Connecting to a Repro Radio
For 8 track players on which I have performed my special conversion to work with an aftermarket reproduction
radio, it is only necessary to connect the 8 track player's RCA outputs to the radio's AUX input, using either a
standard stereo RCA cable or an adaptor cable if the radio has the 3.5 mm round type jack.  The radio will sense the
presence of audio at its AUX input and automatically switch between radio and AUX functions.
Front Center
NOTE:  It is not necessary to use all speakers shown in the diagrams below.  For situations such a using
only a single dash speaker, use any one of the speaker outputs,  then just leave the remaining speaker
wires unconnected.  The conversion electronics will sense how many speakers are being used and will
adjust its behavior accordingly (such as disabling the balance and fader functions with a single speaker).
Full Delco System Conversion - Connection Diagram
to Use Both the 8 Track and AUX Functions
In this arrangement, the radio will come back on immediately when the tape is removed, but will wait 20 seconds
to come back on after using the AUX input.  This is due to the radio's VOX (Voice Operated Switch) circuit that
keeps the AUX connection active longer than necessary to prevent constant switching between songs and during
quieter music passages.  The required adaptor cables are available from www.parts-express.com

Using these adaptor cables makes all failure-prone items external to the units, so that the user can simply
replace the cables and adaptors when necessary, without needing to remove the radio or 8 track player again.
8 Track
3.3 mm
stereo AUX
for portable
audio device
12 volt control signal to force radio to AUX mode with tape inserted
Left channel audio
Right channel audio
RCA "Y" Adaptors
(2 required)

Parts Express part number
5 foot adaptor cable with 2
male RCA plugs on one end
and a stereo 3.5 mm male plug
on the other end (1 required)

Parts Express part number
NOTE:  To prevent damage from
accidental miswiring, the cable
transferring the 12 volt control
signal uses different connectors.
Note that in most cases, I will
install the AUX IN jacks on the
8 track unit - this eliminates the
need for confusing Y cables and
will simplify your wiring job.
1970 - 71 Delco AM-8 Track Radio
GND     LF      RF     RR     LR
GND  GND   12V    Lamp
(Note:  Label on Radio is INCORRECT)