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INSTALLATION  INSTRUCTIONS

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

LED INDICATOR

A red LED is located on the top of the MSD 6AL. It is used to monitor the current status of the 6AL 

ignition.

Key power ON-engine 

OFF
Key power ON-engine 

OFF
Key power ON-engine 

cranking
Key power ON-engine 

cranking

One long flash 

One long flash + 5 

short flashes
Continuous flashing 

No flashing

6AL box is 

functioning Normal
6AL box is 

functioning Normal
6AL box is 

functioning Normal
6AL box is 

functional

Rev Limiter verification 

function active (ON)
Rev limiter verification 

function deactivated (OFF)
LED flashes each time the 

ignition fires
Check Power, ground and 

crank sensor connections

Note:

 When the engins is running, the LED will appear to be ON. This is normal and is due to the 

rapid flashing of the LED on each ignition firing event.

Note: 

Solid Core spark plug wires cannot be used with an MSD Ignition.

Note: 

Do not use digital or dial-back timing lights.

REV LIMITER

The Digital 6AL features a built-in Soft Touch Rev Control that provides a smooth and accurate rev 

limit by dropping the spark to individual cylinders. The Soft Touch produces a load-free rev limit that 

is within 1% of the selected rpm.The rpm limit is adjusted in 100 rpm increments with the sealed 

rotary switches under the black cover on top of the 6AL. 

CYLINDER SELECT

The MSD is programmed at the factory for use on 8-cylinder engines. If you are installing it to a different 

engine you will have to program the Ignition. This is easily achieved through the cylinder select wire 

loops on the side of the ignition. Page 5 outlines setting the cylinder select. 

GENERAL INFORMATION

BATTERY

The Digital 6A and 6AL will operate on any negative ground, 12 volt electrical system with a distributor. 

The MSD can be used with 16 volt batteries and can withstand a momentary 24 volts in case of jump 

starts. The Ignition will deliver full voltage with a supply of  9 - 18 volts.
If your application does not use an alternator, allow at least 15 amp/hour for every half hour of 

operation. The MSD uses about .9 Amps for every 1,000 rpm. If the engine is cranked with the same 

battery or other accessories such as an electric fuel or water pump are used, the amp/hour rating 

should be higher.

COILS

The Digital 6A and 6AL Ignition can be used with most stock coils and aftermarket coils designed to 

replace the stock coils. The line of MSD Blaster Coils are great for street and mild racing. For extended 

high rpm operation the Blaster HVC, PN 8252 or HVC II, PN 8253, are recommended. For more 

information on recommended coils, check with our Customer Service Department at (915) 855-7123.

TACHOMETERS

The MSD Ignition features a Gray Tach Output wire that provides a trigger signal for tachometers, a 

shift light or other add-on rpm activated devices. The Tach Output wire produces a 12 volt square 

wave signal with a 20% duty cycle. 
Some vehicles with factory tachometers may require a Tach Adapter to operate with the MSD. For 

more information on Tachometers and MSD Tach Adapters, see the Tachometer Section on page 6. 

If your GM vehicle has an in-line filter it may cause the tach to drop to zero on acceleration. If this 

occurs, bypass the filter.

Summary of Contents for 6A 6201

Page 1: ...o the coil positive terminal is always at full power even at high rpm MULTIPLE SPARKS The MSD produces full power multiple sparks for each firing of a plug The number of multiple sparks that occur dec...

Page 2: ...ogram the Ignition This is easily achieved through the cylinder select wire loops on the side of the ignition Page 5 outlines setting the cylinder select GENERAL INFORMATION BATTERY The Digital 6A and...

Page 3: ...p is exactly right for your application It is recommended to follow the engine builder or manufacturer s specification for spark plugs With that you can then experiment with the plug gap to obtain the...

Page 4: ...its that can be used to trigger the MSD Ignition a Points circuit the White wire and a Magnetic Pickup circuit the Green and Violet wires Only one circuit will be used at a time This wire is used to c...

Page 5: ...be running as you make adjustments to the rev limiter function REV LIMITER VERIFICATION The MSD Digital 6AL has an optional built in Rev Limiter Verification feature When the key is in the On position...

Page 6: ...battery positive and negative terminals The battery is connected and fully charged if not using an alternator The engine is equipped with at least one ground strap to the chassis If you are installing...

Page 7: ...igger and you are using the White wire to trigger the MSD you will need the PN 8910 BALLAST RESISTOR If you have a current trigger tach originally coil positive and use the White wire of the MSD you c...

Page 8: ...llest wire exiting the alternator Figure 7 It is usually a Brown wire SMALLER OF THE 2 WIRES DIODE WIRE LOOM GM 2 WIRE ALTERNATORS Figure 7 Installing the Diode to a 1973 1983 GM Vehicle 1A 100V DIODE...

Page 9: ...e ignition is working properly If there is no spark skip to step 6 If triggering with the Magnetic Pickup 1 Make sure the ignition switch is in the Off position 2 Remove the coil wire from the distrib...

Page 10: ...s it is recommended to remove the trailing set of points MSD SYSTEMS Installing to an MSD Distributor Crank Trigger NOTE Ballast Resistor is not necessary NOTE Remove the coil terminal wires The negat...

Page 11: ...T USED GRAY TACH OUTPUT GREEN VIOLET DIGITAL 6AL REV LIMITER MSD SYSTEMS With an MSD Timing Control points or amplifier MOST TIMING CONTROLS TIMING CONTROL UNIT CONTROL KNOB IGNITION TM MAGNETIC PICKU...

Page 12: ...il connector is labeledA B C The wire in the A port is positive pink The wires in B and C are coil negative wires color will vary by application BOTH PINKS BOTH WHITES BOTH WHITES FACTORY HARNESS CUT...

Page 13: ...TIONS GM Large Cap HEI Distributors FOUR PIN SEVEN PIN FIVE PIN There are three different large cap HEI distributors To identify which of the following diagrams fit your specific application remove th...

Page 14: ...ND C NOTE Some 5 pin models may experience a hesitation or stall on deceleration If this occurs contactMSDTechLine fortherequiredbolt indiodeto correcttheproblem MSDTech Line 915 855 7123 GM IGNITIONS...

Page 15: ...AL REV LIMITER FORD IGNITIONS Wiring a Ford DuraSpark using Magnetic Pickup Trigger NOT USED FORD DISTRIBUTOR VIOLET ORANGE VIOLET BLACK NOT USED DISTRIBUTOR CONNECTOR DISCONNECT FROM ORIGINAL HARNESS...

Page 16: ...EEN INDICATES CONNECTION NOT USED COVER WITH TAPE ORANGE BLACK GRAY TACH OUTPUT RED WHITE HARNESS MAGNETIC PICKUP CONNECTOR GREEN VIOLET DIGITAL 6AL REV LIMITER FORD IGNITIONS Wiring a Ford TFI with H...

Page 17: ...OLET INDICATES CONNECTION DIGITAL 6AL REV LIMITER NOTE Original wiring must be cut MSD offers two direct plug in harnesses PN 8889 for 90 97 and PN 8884 for 98 03 DUAL MAGNETIC PICKUP DISTRIBUTOR TO D...

Page 18: ...IC PICKUP NOT USED GRAY TACH OUTPUT GREEN VIOLET DIGITAL 6AL REV LIMITER Wiring a Toyota with a Tach Adapt PN 8910HEI GENERAL IMPORT WIRING ORANGE TO COIL BLACK TO COIL INDICATES CONNECTION MAGNETIC P...

Page 19: ...HARNESS VIOLET VIOLET ORANGE BLACK GRAY TACH OUTPUT RED WHITE FROM IGNITION KEY ORIGINAL COIL WIRE DIGITAL 6AL REV LIMITER AFTERMARKET COMPONENTS Wiring to a Pertronix Ignitor Kit If you did not find...

Page 20: ...possible using Ground shipping methods ground shipping is covered by warranty For more information call MSD at 915 855 7123 MSD technicians are available from 7 00 a m to 5 00 p m Monday Friday mount...

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