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.

M S D I G N I T I O N • ww w .m s di g ni t io n .c o m • ( 9 15 ) 85 7 -5 2 00 • FAX ( 91 5 ) 85 7- 33 4 4

2 INSTALLATION INSTRUCTIONS

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

M S D I G N I T I O N • ww w .m s di g ni t io n .c o m • ( 9 15 ) 85 7 -5 2 00 • FAX ( 91 5 ) 85 7- 33 4 4