MSD 7720 Power Grid System - Ignition Control Only Installation - Manual (Page 3)

INSTALLATION INSTRUCTIONS 3
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MOUNTING
The Power Grid 7 can be mounted in most any spot that would be acceptable for other MSD boxes.
However, if the Ignition is to be mounted with the System Controller paired in the top mounting
position particular attention should be paid to the heat around the units. In this stacked position it is
recommended that the units be mounted inside the vehicle cabin.
When you find a suitable location to mount the unit, make sure the wires of the ignition reach their
connections. Hold the ignition in place and mark the location of the mounting holes. Use a ¼” drill
bit to drill the holes. Install the vibration mounts to the ignition and mount the unit.
The Power Grid System Controller (PN 7730) is designed to
be mounted on top of the PN 7720 Ignition. Be sure to mount
the Power Grid System Controller so the USB connector
and Micro-SD card are accessible. The PN 7730 comes with
thread-turning (aka. Self-tapping) screws that will cut into the
walls of the pre-drilled holes on the top corners of the Power
Grid-7.
WIRING
GENERAL WIRING INFORMATION
Wire Length: All of the wires of the MSD Ignition may
be shortened as long as quality connectors are used or
soldered in place. To lengthen the wires, use one size
bigger gauge wire (10 gauge for the power leads and 16
gauge for the other wires) with the proper connections. All
connections must be soldered and sealed.
Grounds: A poor ground connection can cause many frustrating problems. When a wire is specified
to go to ground, it should be connected to the battery negative terminal, engine block or chassis.
There should always be a ground strap between the engine and the chassis. Always securely connect
the ground wire to a clean, paint free metal surface.
Noise Capacitor: MSD offers a Noise Capacitor or Filter to help eliminate EMI noise. This capacitor,
PN 8830, will also protect the MSD and accessories from voltage and current spikes.
ROUTING WIRES
The MSD wires should be routed away from direct heat sources such as exhaust manifolds and
headers and any sharp edges. The trigger wires should be routed separate from the other wires and
spark plug wires. It is best if they are routed along a ground plane such as the block or firewall which
creates an electrical shield.
WARNING: The MSD Power Grid Ignition is a capacitive discharge ignition. High voltage is present
at the coil primary terminals. Do not touch the coil or connect test equipment to the
terminals.
Figure 3 Mounting