MSD 8870 Coil Interface Block,GM Dual Tower Coils Installation - Manual (Page 2)

2 INSTALLATION INSTRUCTIONS
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4. With the 12 volt terminals identified, mark the four wires of the Interface Module (Figure 3). The
White wire above the 12 terminal wire will always be Coil Positive (+). The other White wire will
always be the coil negative wire.
5. The Black wire above the 12 volt terminal will always be the 12 volt source to the MSD. The other
Black wire is the trigger source.
6. Position the MSD Interface Modules on the ignition module and terminals.
7. Remove the protective backing from the gasket and install the gasket with the adhesive side
towards the interface module.
8. Install the Coil using the longer bolts supplied with the Interface Module and connect the
spark plug wires.
9. Refer to the DIS Ignition Instructions to connect the wires.
Figure 3 Wiring After Locating the 12 Volts Terminal.
Note the different wiring callouts when the 12 volt terminal is opposite.
Figure 4 Write in Your 12 Volt Application.