MSD 7330 7AL-3 Ignition Control Installation - Manual (Page 11)

INSTALLATION INSTRUCTIONS 11
M S D
• W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
WIRING CHECK
WARNING: The 7AL-3 produces very high voltages. Never short the battery or coil terminals. Use
caution during installation and while working near the ignition.
• Check all of the wire connections making sure they are clean and tight. If connectors have been
crimped on make sure they are tight and sealed.
• Make sure the battery is fully charged and properly connected. Also confirm that the MSD power
leads are connected properly and are tight.
• With a test light check that there is voltage on the RED “Ignition” terminal of the MSD when the
ignition is in both the On and START position.
• Check that the only wires connected to the coil are from the MSD. ORANGE should connect to
the positive terminal (570V), BLACK to the negative terminal (Ground).
Note: DO NOT connect any test equipment to the coil terminals.
After checking the wiring for loose or faulty connections, follow the next steps to confirm that the unit
is “sparking” properly.
CHECKING FOR SPARK
The following procedures will determine if the ignition is producing a spark. Before proceeding, inspect
all of the wiring and ensure that the Green LED is flashing when the engine is cranked. This ensures
that the ignition is receiving a trigger signal .
Magnectic Pickup (Green and Violet):
1. Make sure the ignition is turned OFF and remove the coil wire from the distributor cap. Pull the
boot back so the terminal is easy to see and position the wire 1/2" from ground.
2. Disconnect the magnetic pickup connector from the distributor.
3. Turn the ignition switch to the ON position. DO NOT CRANK THE ENGINE.
4. Take a small lengh of wire and short the Green and Violet wires together 3 or 4 times. A spark
should jump from the coil wire to ground every time the connection is broken.
5. If there is no spark, substitute another coil and test again. If there is still no spark and all of the
wiring connections have been confirmed, contact the MSD Customer Service Line and send the
unit in for repair.
White Wire Trigger:
1. Make sure the ignition is turned OFF and remove the coil wire from the distributor cap. Pull the
boot back so the terminal is easy to see and position the wire 1/2" from ground.
2. Disconnect the White wire from the distributor.
3. Turn the ignition switch to the ON position. DO NOT CRANK THE ENGINE.
4. Tap the White wire to ground 3 or 4 times. A spark should jump from the coil wire to ground when
the white wire is removed from ground.
5. If there is no spark, substitute another coil and test again. If there is still no spark and all of the
wiring connections have been confirmed, contact the MSD Customer Service Line and send the
unit in for repair.