Clockwise Rotation - PN 8130, PN 81303, PN 81305
Counterclockwise Rotation – PN 8140, PN 81403, PN 81405
Parts Included In This Kit:
1 – 44 Amp Pro Mag Generator
1 – Timing Tape, PN 8126
MSD 44 Amp Pro Mag Generator
MSD Pro Mag Information
Congratulations on selecting the MSD Pro Mag – the most powerful and reliable magneto available!
The following information will answer some of the questions you may come across concerning the
Pro Mag. If you need more assistance, please contact our Customer Support Department at (915)
855-7123 or drop an email to
msdforms@msdperformance.com.
INITIAL TIMING SETUP
A traditional “Buzz Box” cannot be used to set the timing of a Pro Mag because there are no
mechanical points. The Pro Mag incorporates a high output magnetic pickup that ensures accurate
timing and never requires adjustment. Follow these steps to
set timing:
Distributor Cap
1. Position the crankshaft to your desired timing.
Terminal
Rotor Tip
2. Position the generator in the engine with the rotor tip
leading into the #1 terminal of the cap (Figure 1).
3. Start the engine and verify the timing with a quality timing
light such as MSD’s PN 8992 or PN 8991. and adjust timing as
needed.
R
ot
ation
CONVENTIONAL TIMING VS. THE PRO MAG
When converting from a “conventional” (non-MSD) mag-
neto to a Pro Mag, it may be necessary to review your tune up.
It is common for the ignition timing to accept a few degrees
of retard or an increase in fuel to prevent lean mixtures. Tak-
ing the time to test and tune with small incremental changes
will prove very beneficial.
Figure 1 Rotor Tip and Cap Alignment.
CAP AND ROTOR MAINTENANCE
Due to the spark energy that MSD Pro Mags produce it is recommended to inspect the cap, rotor
and spark plug wires at closer intervals. The components that are supplied with the Pro Mags are
designed for strength and reliability but still require maintenance. Visually inspect for excessive wear
or carbon tracking. Cap and Rotors are available as a kit from your MSD Dealer:
Cap and
Generator
Rotor Kit
Standard Chevy Generator, Pro Mag 12LT (4" cap)
PN 7919 (Red) PN 79193 (Black)
Band Clamp Generators (4" cap)
(12, 20 and 44 Amp Versions)
PN 8119
Pro-Cap:
5" Cap - PN 7408 (red) or PN 74083 (black), Rotor - PN 7423, Base - PN 7456 (red) or
PN 74563 (black) and Rotor Terminal - PN 7411.
MSD
• WWW.MSDPERFORMANCE.COM • (915) 855-7123 • FAX (915) 857-3344
2
USER INFORMATION
CAP-A-DAPTS
When space permits, upgrading to a larger diameter magneto
cap can add extra protection against spark scatter and crossfire.
MSD offers a Cap-A-Dapt for each style Pro Mag. Each kit is sup-
plied with everything required to install the new, large cap and
rotor assembly.
Pro-Cap, PN 7455 (5" cap)
The largest cap and rotor available plus the entire assembly is
molded from strong Rynite material. Designed for MSD generators
with a four inch diameter (Figure 2).
Figure 2 Pro-Cap for Pro Mags, PN 7455.
SPARK PLUG WIRES
MSD only recommends using our 8.5mm Super Conductor spark plug wire. This wire features
a copper-alloy conductor with a low resistance of 40 - 50 ohms per foot. The core and winding of
the conductor produce a highly effective Electro Magnetic Interference (EMI) choke so it also has
extremely high EMI suppression capabilities.
Your spark plug wires should be inspected for cuts, abrasions, resistance and continuity. It should
be noted that spark plug wire is a maintenance item of the ignition system and should be replaced
at least three times per season. Note that the coil wire should be replaced more frequently than the
entire wire set due to handling eight times the energy.
To ensure a quality crimp when building spark plug wire sets, use the MSD Pro Crimp Tool, PN 35051.
This Crimp Tool is supplied with the correct crimp dies for the 8.5mm Wire with MSD Dual Crimp Ter-
minals. The dies are also replaceable, PN 3508.
CROSS DRIVES
Band Clamp style Pro Mag generators are equipped with cross drives due to their strength but
existing two and four pin drives will interchange. If the drive is replaced it is recommended to replace
the lock nut. Also use Blue Loctite and torque to 20 lbs-ft. Check out TechTips at www.msdpromag.
com for more information.
CRANKING RPM
MSD Pro Mags require a minimum generator speed of 200-250 RPM to start (at the crank). If a block
mounted starter is used a 16 volt battery will be required to produce reliable starting rpm. Blower
Pulley starters may require 48 volts on Alcohol applications due to pulley drive ratios. On these ap-
plications, a jumber wire should be connected across the coil terminals. Once the engine reaches
the required RPM this jumper should be pulled quickly from the terminals. MSD offers High Speed
Block mounted starters for various applications.
DynaForce High Speed Starters:
Ford 289, 302, 351W
- PN 50902
Ford BB 351M, 400, 429 -
PN 50922
Chevy 10 Pitch/139 Tooth -
PN 50953
Chevy 153/168 Tooth, Pro Mag
- PN 50952
(Pefect for applications with magnetos that require 250+ rpm to start.)
Chevy 318 - 440 -
PN 50982
MSD
•
WWW.MSDPERFORMANCE.COM
• (915) 855-7123 • FAX (915) 857-3344
USER INFORMATION
3
KILL SWITCHES
12 and 20 Amp Pro Mags
Kill switches are supplied with the Electronic Points boxes for the 12 and 20 Amp Pro
Mags. Each Point Box requires a Kill
Switch. Never use one kill switch for
two Points boxes. This MSD Switch,
PN 8111, is the only Kill Switch rec-
ommended for use with the Pro Mag.
MSD 44 Amp Pro Mags
MSD 44 Amp Pro Mags cannot be
used with a common mechanical On/
Off switch. A Kill Switch is available
through MSD, PN 8134. Jumper wires
across the coil terminals are required
when starting the engine (Figure 3).
Figure 3 44 Amp Kill Switch, PN 8134
WARNING:
Extremely high current and voltage is present on the Pro Mag Coil terminals and on
the Kill Switch Relay. Use extreme caution when working around the Coil and Relay.
TO PRO MAG
IGNITION
*NOTE: THE SPACERS MUST BE INSTALLED
BETWEEN THE WIRE TERMINALS AND
RELAY HOUSING.
12V SOLENOID
NORMALLY CLOSED
TO
12 VOLTS
GROUND
JUMPER
WIRE
BLACK
RED
TO COIL
SPACERS*
LOCK
WASHER
NUT
TO COIL
NOTE: ONE KILL SWITCH
PER COIL.
IGNITION KILL
SWITCH ON DASH
SLED
BREAK AWAY
SWITCH
TRACTOR PULL
APPLICATIONS
GROUND
(CHASSIS)
BOTH SWITCHES HAVE TO BE
CLOSED TO START MOTOR.
IF EITHER SWITCH OPENS
THE MOTOR WILL STOP.
Figure 4 Typical Wiring on a Tractor Puller.
MSD
•
WWW.MSDPERFORMANCE.COM
• (915) 855-7123 • FAX (915) 857-3344
4
CHASSIS
GROUND
USER INFORMATION
TO RPM +12V SQ WAVE DEVICE
SIGNAL
OUTPUT
SWITCHED
12 VOLT
GREEN
RED
BLACK
GROUND
TM
BLACK
GMR PICKUP
RED
IGNITION
TO GROUND
ON CYLINDER
HEAD
NOTE: The brass screw must be used for proper operation.
METAL TAB
WASHER MUST BE ON TOP OF METAL TAB
GMR PICKUP
PN 8918
PRIMARY COIL (+) WIRE OR
DIESEL INJECTOR 12 VOLT WIRE
Figure 5 GMR to PN 8963 Shift Light on Pro Mag 44 Electronic Points Box.
WIRING AND CONNECTORS
MSD uses Deutsch connectors with the Pro Mag. These connectors should be inspected due to
frequent disconnecting. Lightly pulling on the wires near the connector will make certain they have
not worked loose. The connectors can be disassembled as follows:
1. Remove the orange wedge lock with a small flat blade screwdriver.
2. Pry the spring lock back to unlock the wire, and pull it through.
3. Inspect the wire crimps and reassemble.
12 and 20 Amp Mag Connector.
44 Amp Mag Connector.
Note that the connectors have numbered terminals. Match the color wire with the position as follows:
12 and 20 Amp
#1 Violet
#2 Green
#3 Black
#4 Yellow
#1 Violet
44 Amp
#2 Green
#3 Black
#4 Red
For more information on connectors, check out Tech Tips at www.msdpromag.com.
MSD offers a special kit consisting of connectors used with the ProMag 44. The kit PN 8124 is de-
signed for field repairs.
GENERATOR SUPPORT
In some applications it is recommended that a generator support bracket be fabricated. Due to the
variety of mounting applications, MSD does not offer a single mag bracket. For applications using
two Pro Mags it is recommended to use the Dual Mag Stabilizer Bracket, PN 301821-0004 from RCD
Engineering, wwwRCDengineering.com.
MSD
•
WWW.MSDPERFORMANCE.COM
• (915) 855-7123 • FAX (915) 857-3344
USER INFORMATION
5
TACHOMETERS AND DATA ACQUISITION EQUIPMENT
Tachometers and data acquisition systems require a certain type of trigger signal. Most of these
systems require either a 12-volt square wave signal or a current style inductive pickup. MSD has
components that can provide both signal types.
Tach Terminal
The MSD Timing Retard,
PN 8168 has a Tach
output terminal that pro-
vides a 12 volt square
wave signal.
Tach Converter, PN 8132
This converts the Pro Mag’s
signal to a 12-volt square wave
with a 20% duty cycle. It will
work on all Pro Mag systems
and requires a 12 volt battery
source.
GRAY - TACH
GRID Tach Lead
Figure 6 Wiring a Tachometer with the Tach Converter.
ORANGE
FROM PRO MAG
TACH
TACH TRIGGER WIRE
BROWN/YELLOW
OTHER MAGNETOS
MAG
KILL
SWITCH
BLACK
FROM
PRO MAG
VIOLET
RED TO
SWITCHED 12V
BROWN/ORANGE
PRO MAG/VERTEX
BROWN/BLACK
OR
BLACK
TO BATTERY (-)
TERMINAL
PN 8132
TM
IGNITION
INDICATES CONNECTION
PRO MAG
TACH
CONVERTER
1490 HENRY BRENNAN., EL PASO, TX 79936
AUTOTRONIC CONTROLS CORPORATION
Figure 7 Wiring a Tachometer with the Tach Converter.
MSD
•
WWW.MSDPERFORMANCE.COM
• (915) 855-7123 • FAX (915) 857-3344
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