Technical information

AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN, EL PASO, TEXAS 79936 • [phone] • FAX [phone]
www.msdignition.com email: [e-mail]
50
MSD 7 SERIES TO GM
LARGE CAP HEI DISTRIBUTORS
THE MSD 7 SERIES TO
GM HEI 4-PIN MODULE
If the distributor has a 4-pin module, the module must be removed and the MSD will use the magnetic
pickup to trigger the ignition. A harness, PN 8861, is required for this installation.
CONNECTING THE PN 8861 CABLE TO THE GM HEI MAGNETIC PICKUP
1. Remove the distributor cap and rotor.
2. Disconnect the connector with the white and green wires from the module, and remove the module, condenser
and cable from the distributor.
3. Install the PN 8861 cable as shown using the module mounting screws and the wire clamps supplied in the
MSD Parts kit. Push the two tabs on the PN 8861 cable into the connector from the HEI magnetic pickup
(Green to Green, Violet to White). Notice that the tabs are different sizes so they can be installed one way only.
4. Reinstall the cap and rotor and connect the MSD Ignition control as shown in the next diagram.
NOTE:NOTE:
NOTE:NOTE:
NOTE: The PN 8861 cable is not
supplied with the MSD 7 Ignition.
There are three different large cap HEI distributors. To
indentify which of the following diagrams fit your
specific application, remove the distributor cap and rotor
and locate the ignition module at the base of the
distributor. Count the number of terminals on both ends
of the module and follow the corresponding diagram.
GM used 4, 5, and 7-pin modules in these distributors.
NOTE:NOTE:
NOTE:NOTE:
NOTE: Some 5-pin models may experience a
hesitation or stall on decceleration. If this occurs, contact
MSD Tech Line for the required bolt-in diode to correct
the problem. MSD Tech Line [phone]
NOTE:NOTE:
NOTE:NOTE:
NOTE: A Low Resistance HEI
Rotor Bushing, PN 8412, must be
used with an MSD 7AL Ignition.