MSD 8886 Installation

6LS Harness for EFI Vehicles

PN 8886

IMPORTANT: Read instuctions thoroughly before attempting installation.

Parts Included:

2 - Cam/Crank Sensor Harnesses
1 - Map Sensor Harness
2 - Coil Simulators
2 - Coil Simulator Clips

WARNING: Before installing the 6LS Harness, disconnect the battery cables. When disconnecting

the battery cables, always remove the Negative (-) cable first and install it last.

This Harness Kit allows the installation of the MSD 6LS Ignition Controller on Gen III LS-1 and LS-6
based engine vehicles equipped with factory EFI systems. The Harness connects inline to factory
sensors and provides the 12 volt supply and ground of the Controller. It can also be used on early
Gen IV LS-2 based engines, when combined with Cam Sensor Extension Harness PN 88861.

COIL CONNECTIONS

Note: One of the Coil Simulators has a 3-Pin pigtail. This assembly connects to the passenger side

coil bank.

1 - Crank Sensor Tool Body
1 - Crank Sensor Tool Blade
2 - 6-32 x .250 Screws

Disconnect the factory connector from the coil
harness (Figure 1). Connect the MSD Coil Simulators
inline with the factory harness. Use the supplied clips
to secure the Simulators.

TO MSD
6LS

Figure 1 Coil Connections.

FACTORY
HARNESS
TO PN 8886

FROM
MSD
6LS

M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4

2 INSTALLATION INSTRUCTIONS

MAP SENSOR

Disconnect the MAP sensor harness and install the MSD Harness inline. The Gray Connector of the
Harness goes to the MAP sensor. Connect the MAP connector of the 6LS into the connector with a
single signal wire (Figure 2).

FACTORY HARNESS

TO MSD
6LS

MAP
SENSOR

REAR OF INTAKE

PN 8886
HARNESS

Figure 2 Map Sensor Connection.

CAMSHAFT SENSOR

Locate the Camshaft Sensor. On LS-1/LS-6 based engines, the Cam Sensor is in the rear of the block
where the distributor would generally be (Figure 3). On LS-2 based engines, the Cam Sensor is on
the front of the block. Note that on LS-2 based engines, Cam Sensor Extension Harness, PN 88861
is required.

Disconnect the factory sensor and install the MSD Harness (Black connector) inline. Connect the
Cam Connector of the 6LS to the connector with a single signal wire.

LS-1 SERIES LS-2 SERIES

NOTE:
REQUIRES
EXTENSION
HARNESS
PN 88861

CAM

CAM
SENSOR

REAR OF BLOCK

SENSOR

TIMING
COVER

Figure 3 Camshaft Sensor Location.

M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4