MSD 89121 Installation

Dual Ignition Adapter for

Ford Coil-on-Plug Ignition Systems

PN 89121

IMPORTANT: Read these instructions completely before attempting the installation.

WARNING: During installation, disconnect the battery cables. When disconnecting the battery,

always remove the Negative cable first and install it last.

Parts Included:

1 - Dual Ignition Adapter, PN 89121

This Dual Channel Adapter is designed to be used on Ford Coil-on-Plug Ignitions ('99-On). Four of
these adapters are required with two DIS-4 Ignitions for installation on a V8 engine.

Note: The Wiring Harness that goes to the coil packs and ECU of your DIS Ignition should be equipped

with several bullet connectors. This allows for easy installation of the Adapter if the Harness
does not have the bullet connectors as shown in Figure 1, contact MSD’s Customer Service
and they will send you a special wiring Harness.

MOUNTING

1. Select a location to mount the DIS Adapter. Make sure it is away from direct engine heat sources and
that all of the wiring will easily reach the MSD Ignition.

2. Using the Adapter as a template, mark the location of the mounting holes. Remove the unit and drill
each location using a 1/4” drill bit.
Secure the Adapter using 1/4”
hardware (not supplied).

WIRING

The Adapter has six wires that need
to be connected. The chart shows
each wire’s application. Figure 1
shows how to wire the Adapter to
the DIS Ignitions.

Black Connects to Ground, Heavy Black of DIS
Red Connects to 12 volt (Ignition)

Brown/White Connects to the White or Yellow wire going

Brown/Green Connects to the Green or Violet wire going

White Connects to the White or Yellow wire going

Green Connects to the Green or Violet wire going

1 - Parts Bag

INPUTS

to the Coils and ECU.

to the Coils and ECU.

OUTPUTS

to the MSD DIS Ignition

to the MSD DIS Ignition.

Note: See page 4 for 6-cylinders.

Figure 1 Installation to an MSD DIS-4 Ignition using Four Channels.

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2 INSTALLATION INSTRUCTIONS

Figure 2 Installation of two DIS-4 Plus Ignitions to a 2004 Cobra - Cylinders 1, 7, 6, 4.

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INSTALLATION INSTRUCTIONS 3

Figure 3 Installation of two DIS-4 Plus Ignitions to a 2004 Cobra - Cylinders 3, 2, 5, 8.

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Figure 4 Installation to an MSD DIS-4 using Three Channels.

Service

In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty.

When returning MSD components for warranty service, Proof of Purchase must be supplied for verification. After
the warranty period has expired, repair service is based on a minimum and maximum fee.

All returns must have a Return Material Authorization (RMA) number issued to them before

being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or
visit our website at www.msdignition.com/rma to automatically obtain a number and shipping information.

When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include
a detailed account of any problems experienced, and what components and accessories are installed on the vehicle.
The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered
by warranty). For more information, call MSD Ignition at [phone]. MSD technicians are available from 7:00
a.m. to 6:00 p.m. Monday - Friday (mountain time).

Limited Warranty

M

SD IGNITION warrants this product to be free from defects in material and workmanship under its intended normal
use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date
of the original purchase. This warranty is void for any products purchased through auction websites. If found to be
defective as mentioned above, it will be repaired or replaced at the option of MSD Ignition. Any item that is covered
under this warranty will be returned free of charge using Ground shipping methods.
This shall constitute the sole remedy of the purchaser and the sole liability of MSD Ignition. To the extent permitted
by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied,
including any implied warranty of merchantability or fitness. In no event shall MSD Ignition or its suppliers be liable
for special or consequential damages.
*Intended normal use means that this item is being used as was originally intended and for the original application
as sold by MSD Ignition. Any modifications to this item or if it is used on an application other than what MSD Ignition
markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item
will work for the application they are intending. MSD Ignition will accept no liability for custom applications.

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© 2007 Autotronic Co ntrols Cor poration

FRM28748 Revised 06/07 Printed in U.S.A.