MSD 7720 User Manual

M S D I G N I T I O N • W W W. M SD IG NI TI ON .C OM • ( 91 5) 8 5 7- 52 00 • F A X (9 15 ) 85 7- 33 4 4
Parts Included:
1 - MSD PowerGrid 7 Ignition Controller
1 - Wire Harness
1 - Parts Bag
WARNING: During installation, disconnect the battery cables. When disconnecting, always remove
the Negative cable first and install it last.
Note: Solid core spark plug wires cannot be used with an MSD Ignition Control.
MSD Power Grid 7 Ignition Control
PN 7720
ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered
in our monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product
will help if there is ever a warranty issue with your product and helps the MSD R&D team create
new products that you ask for! Go to www.msdignition.com/registration.
The Power Grid 7 Ignition Control was specifically designed to pair with the Power Grid System
Controller, PN 7730. This Ignition system is designed for racing applications; it is not for sale for legal
use on highways.
SPECIFICATIONS
Spark Energy: 200 – 220 milliJoules/spark
Primary Voltage: 545 – 570 volts
Secondary Voltage: 50,000 volts plus
Spark Series Duration: 20° Crankshaft Rotation
RPM Range: 15,000 rpm with 14.4 volts
Voltage Required: 12 – 18 volts, Negative Ground
Current Draw: 1.3 Amp per 1,000 rpm
Weight and Size: 2.9 LBS, 7.5”L x 5”W x 2.25” H
GENERAL INFORMATION
BATTERY
An MSD Power Grid 7 Ignition Control will operate on any negative ground, 12 volt electrical system
with a distributor. The MSD can be used with 18 volt batteries and can withstand a momentary 24
volts in case of jump starts. The Ignitions will deliver full voltage with a supply of 10 - 18 volts and
will operate with a supply voltage as low as five volts.
If your application does not use an alternator, allow at least 15 amp/hour for every half hour of operation.
If the engine is cranked with the same battery or other accessories such as an electric fuel or water
pump, the amp/hour rating should be higher.
COILS
It is recommended to use either the Pro Power HVC, PN 8251, or Pro Power HVC II, PN 8261. If you
have any questions concerning coils, contact our Customer Service Department at (915) 855-7123.

MSD 7720 Specifications

General

Brand	MSD
Model	7720
Category	Controller
Language	English

Summary

Specifications

General Information - Battery

Details on the battery requirements and operation of the MSD Power Grid 7 Ignition.

General Information - Coils

Recommendations for specific coils to use with the MSD Power Grid 7 Ignition.

Spark Plugs and Wires

Spark Plug Wire Routing

Guidance on proper routing of spark plug wires to minimize interference and ensure performance.

Spark Plugs

Information on selecting and gapping spark plugs for optimal performance with the ignition system.

Miscellaneous Information

Sealing and Protection

Instructions regarding the sealing of the MSD unit and protection from moisture.

Welding Precautions

Safety measures to take when welding on a vehicle to prevent damage to the ignition system.

Distributor Cap and Rotor

Recommendations for inspecting or replacing the distributor cap and rotor for optimal function.

Mounting

Wiring

General Wiring Information

Best practices for wire length, connections, grounds, and noise suppression.

Routing Wires

Guidelines for routing wires to avoid heat, sharp edges, and interference.

Deutsch Male 4-Pin Connector Wiring

Details for connecting the Deutsch male 4-pin connector to power and the coil.

Deutsch Female 4-Pin Connector Wiring

Details for connecting the Deutsch female 4-pin connector for ignition and trigger signals.

Prestart Checklist

Troubleshooting

Misses and Intermittent Problems

Common causes and inspection points for engine misses or hesitation at higher RPMs.

Checking for Spark

Triggering with White Wire

Procedure for testing spark by triggering the ignition with the white wire.

Triggering with Magnetic Pickup

Procedure for testing spark by triggering with magnetic pickup wires.

No Spark Troubleshooting

Steps to diagnose and resolve issues when no spark is present.

Isolating Power Grid 7 Ignition

Method to test the Power Grid 7 Ignition unit independently from the system controller.

Tech Notes

Service Information

Details on warranty service, repairs, and contacting customer support.

Limited Warranty

Information on the product warranty period, coverage, and limitations.