MSD 8875 Installation

MSD to GM HEI Distributor Harness

PN 8875

IMPORTANT: Review the installation procedures of the MSD 6

Series Ignition prior to connecting the wiring harness.

This Harness is designed to simplify the installation of an MSD 6 Series Ignition Control to a GM HEI Distributor that uses a 5-pin or 7-pin module (Figure 1). Most of these distributors DO NOT have a vacuum advance.

Note: On HEI distributors with a 4-pin module, this Harness cannot be used.

1. Disconnect the 12 volt key connector, the 3-wire connector coming out of the distributor and the Tach Connector (if applicable).

2. Connect the Pink, Black and one of the Brown wires of the Harness to the corresponding wires of the 3-wire connector coming out of the distributor.

3. Connect the Red wire of the Harness to the key connector.

4. Plug the 3-wire connector of the Harness into the distributor cap.

5. Connect the Orange, Black, Red and White wires of the Harness to the corresponding wires of the MSD Ignition Control.

6. If there was a tach wire going into the distributor cap, connect it to the other brown wire of the MSD harness. If a tach is not being used, tape and seal this connector.

Figure 1 Different

HEI Modules.

Figure 2 Wiring the PN 8875 Harness

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In some rare applications with a 5-Pin HEI Ignition Module, the engine may run erratically or shut off on deceleration after the MSD Ignition is installed. To correct this, a diode assembly is available from MSD Customer Support. The diode assembly installs on the input end of the module on the middle terminal (Figure 3). Be sure the supplied lock washers are installed under the tab of the diode assembly.

Figure 3 Installing the Diode Assembly with a 5-Pin Module.

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 service, Proof of Purchase must be supplied for warranty veriﬁcation. After the warranty period has expired, repair service is charged based on a minimum and maximum charge.

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 after receipt. (Ground shipping is covered by warranty). All units are returned regular UPS unless otherwise noted. For more information, call MSD Ignition at (915) 855-7123. MSD technicians are available from 7:00 a.m. to 6:00 p.m. Monday - Friday (mountain time).

Limited Warranty

SD IGNITION warrants MSD Ignition products to be free from defects in material and workmanship under normal use and if properly installed for a period of one year from date of purchase. If found to be defective as mentioned above, it will be replaced or repaired if returned prepaid along with proof of date of purchase. 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 representations whether expressed or implied, including any implied warranty of merchantability or ﬁtness. In no event shall MSD Ignition be liable for special or consequential damages.

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FRM28504 Revised 04/07 Printed in U.S.A.