12-Volt Negative Ground Installation Instructions
For Part Number:
MV-141AN12 & MV-161AN12
CAUTION!!! Before installing, please read the following important information....CAUTION!!! Before installing, please read the following important information....
1. The Ignitor is designed for 12-Volt negative ground systems.
2. Leaving the ignition “ON” with the engine “OFF” for an extended period could result in permanent damage to
the Ignitor.
3. See Chart on back page for coil recommendations.
4. Four & Six cylinder engines require a minimum of 3.0 ohms of primary resistance. Do not remove resistors if
the coil primary resistance is less than 3.0 ohms.
5. If your Ignition coil has the recommended primary resistance, remove or bypass all external resistors.
6. The Ignitor is compatible as a trigger for most electronic boxes.
DISASSEMBLY
1. PRIOR TO INSTALLATION TURN IGNITION SWITCH OFF OR DISCONNECT THE BATTERY
2. Remove distributor cap and rotor from distributor. Do not disconnect spark plug wires from cap. Examine cap
and rotor for wear or damage. Replace as needed.
3. Remove the point wire from the negative (-) terminal of the Ignition coil. Loosen the two screws that attach
the coil bracket.
4. Remove the two screws and springs that hold the points plate in the distributor. Lift the complete plate out of
the distributor. Installing the Ignitor does not alter the internal configuration of your distributor. Therefore, the
points, condenser and hardware can be used as backup.
5. Clean all dirt and excess oil from the point cam.
IGNITOR INSTALLATION
1. Place the Ignitor adapter plate into the distributor. In some cases the new plate may need to be trimmed in
the area shown in figure 1 to permit installation. If trimming is necessary, use a file to remove material. A
snug fit is better than one that is too loose.
2. Use the original screws and spring clips to fasten the Ignitor plate into the distributor housing.
3. Install magnet sleeve over distributor shaft and onto point cam. Rotate sleeve until a slight locating position
is felt before applying pressure. With sleeve lined up on point cam, press down firmly insuring sleeve is fully
seated.
4. Module and magnet sleeve air gap is not adjustable.
5. Run the module wires between the coil bracket and to each coil terminal.
6. Tighten the wires down and the coil bracket back in place. Make sure the Ignitor wires are not contacting any
moving parts.
7. See Wiring Instructions.
Figure 1
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Page 1 of 4
A. Recommended Wiring Installation:
NOTE: The factory or replacement coil must have 3.0 ohms of resistance to avoid permanent damage to the Ignitor. The Ignitor
ignition can be used in conjunction with most ignition coils rated at 3.0 ohms on four and six cylinder engines.
1. Attach the black Ignitor wire to the negative coil terminal. (See Figure A).
2. Attach the red Ignitor wire to the positive coil terminal.
3. Check to insure that the polarity is correct, and that all connections are tight.
4. Reinstall the rotor, and the distributor cap. Make sure all spark plug wires are securely attached.
5. Re-connect the battery.
6. Start the engine and allow it to reach normal operating temperature. Check ignition timing, and adjust to the desired setting.
(FIGURE A)
B. Alternative Wiring Installation:
If the factory coil does not have the recommended resistance modifications to the distributor may be required to install a ballast
resistor and or external coil.
1. Attach the Ignitor black wire to the negative coil terminal. (See Figure B)
2. Attach the Ignitor red wire to the ignition side of resistance, or any 12 volt ignition power source.
3. Check to insure that the polarity is correct, and that all connections are tight.
4. Re-connect the battery.
COIL WIRE
BALLAST RESISTOR
TO IGNITION SWITCH
RED WIRE
(FIGURE B)
BLACK WIRE
RESISTANCE WIRE
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Ignitor COMMON QUESTIONS AND ANSWERS
Q. What is the first thing I should check if the engine would not start?
A. Make certain all wires are connected securely to the proper terminals.
Q. The engine will not start or runs rough. Are there any tests I can do?
A. Yes, remove the red ignitor wire from the coil. Connect jumper wire from the
positive side of the battery to the red ignitor wire just removed from the coil. If the
engine starts, then you have a low voltage problem . Remember this is just a test. Not
intended for permanent installation.
Q. How can I fix a low voltage problem?
A. First, if you have an external ballast resistor or resistance wire, connect the red
ignitor wire to the ignition wire prior to the ballast resistor or resistance wire. Second,
if you do not have a an external resistor you must connect the ignitor red wire to a
12-volt source that is controlled by the ignition switch.
Q. Should I remove the starter bypass wire?
A. No, the starter bypass wire is needed to provide voltage while starting (cranking).
Q. What type of coil do I need?
A. The ignitor is compatible only with a “points type” coil. Eight cylinder engines
require a minimum of 1.5 Ohms of resistance in the primary circuit. Four & six cylinder
engines require a minimum of 3.0 Ohms of resistance (primary).
Q. How do I check my coil for resistance?
A. First you need an ohmmeter. Remove all the wires from the coil. Attach the
ohmmeter to both the positive and negative terminals. The reading should be 1.5
POWER & GROUND TESTS
Ohms or greater for eight cylinder engines and 3.0 Ohms or greater for six cylinder
engines. (Your local auto parts store can do this for you if you don’t have an
ohmmeter)
Q. What do I do if my coil does not have enough resistance?
A. You may purchase and install a ballast resistor from your local auto parts store.
You may also choose to purchase a Flamethrower 40,000-volt coil, which provides
resistance internally. Note: Many vehicles come with ballast resistor or resistance
wire. These applications do not need an additional resistor.
Q. What happens if you leave the ignition switch on when the engine is not running?
A. This can cause your coil to overheat, which may cause permanent damage to the
coil and the ignitor.
Q. May I modify the length of the wires?
A. Yes, you can cut the wires to any length your application may require. You may
also add length of wire if needed (20-gauge wire). Please make sure all wire splice
are clean and connections are secure.
Q. Will the shift interrupter on an OMC stern drive boat work with the ignitor?
A. The ignitor is compatible with all OMC stern drive applications, when equipped
with a “diode fix”. If you purchased a kit that does not include the “diode fix” diagram,
call our tech line.
Q. How can I get additional help?
A. Call our tech line (909-547-9058) for any further instructions or questions.
GROUND TESTS
It is imperative that the power and grounds be checked as part of the installation procedure. After installing the Ignitor module and the
distributor and with the distributor in the engine, use a digital multi-meter to measure the resistance from the aluminum plate holding the
module to battery (-), the net resistance must be less than 0.2 ohms. (Set meter to lowest ohms setting). The net resistance is the meter
reading minus the resistance of the meter leads. If the net resistance is greater than 0.2 ohms, the source of the faulty ground must
be found and fixed. Usually the source of the bad ground is easily found by holding one probe on an original location and moving the
second probe toward the static probe. Where the resistance drops identifies the source.
GROUND TESTS
Maximum resistance from Ignitor plate to battery negative terminal. 0.2 ohms
EXAMPLE:
Resistance from Ignitor plate to battery negative (-) terminal. 0.4 ohms
Resistance of meter leads 0.2 ohms
After subtracting meter lead resistance, your net resistance is: 0.2 ohms
VOLTAGE TESTS:
1. (Do not disconnect wires from Ignition coil). Place ignition switch in the “off” position.
2. Connect a jumper wire from negative (-) terminal of the coil to a good engine ground.
3. Connect the voltmeter red lead to the positive (+) terminal of the coil and the black lead to a good engine ground.
4. Turn the ignition switch to the “on” position and note voltage reading on the voltmeter. Quickly read the voltage and turn ignition “OFF”.
Leaving ignition “ON” for an extended period could result in permanent damage to the Ignitor.
5. SEE CHART BELOW FOR SPECIFICATIONS.
Note: Low voltage can be caused by poor connections, poor contacts in the ignition switch, ballast resistor, and or a resistance
wire in the wiring harness (Factory Installed).
VOLTAGE SPECIFICATIONS
Minimum Maximum
Ignition Switch “ON” 8.0V N/A
Cranking 8.0V N/A
Engine Running N/A 16.0V
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Page 3 of 4
FLAME-THROWER COIL APPLICATIONS
Recommended Flamethrower Coils
Black Chrome Epoxy
Use with:
System
Voltage
Cylinders
Primary
Resistance
Ignitor Only 12V 8 1.5 ohms 40011 40001 40111
Ignitor Only 12V 4 & 6 3.0 ohms 40511 40501 40611
Agricultural & Industrial
Ignitor Only 12V 1,2,3,4, & 6 2.8 ohms 28010 or 40511, 40501, 40611
Ignitor Only 12V 8 1.5 ohms 40011 40001 40111
NOTE: REMOVE OR BYPASS EXTERNAL BALLAST RESISTOR OR RESISTANCE
WIRE WHEN INSTALLING THE RECOMMENDED FLAME-THROWER COIL.
LIMITED WARRANTY
Pertronix, Inc. Warrants to the original Purchaser of its solid-state ignition system
(product) that the Ignitor, magnet assembly and wiring (components) shall be free from defects
in material and workmanship for a period of (30) months from the date of purchase.
If within the period of the foregoing warranty Pertronix finds, after inspection, that
the product or any component thereof is defective, Pertronix will, at its option, repair such
products or component or replace them with identical or similar parts PROVIDED that within
such period Purchaser:
1. Promptly Notifies Pertonix, in writing, of such defects.
2. Delivers the defective products product or component to Pertronix (ATTN: Warranty) with
proof of purchase date; and
3. Has installed and used the product in a normal and Proper manner, consistent with
Pertronix printed instructions.
THE FORGOING LIMITED WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING AND IMPLIED
WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PURPOSE.
THE FURNISHING OF A REPAIR OR REPLACEMENT COMPONENTS SHALL CONSTITUTE
THE SOLE REMEDY OF PURCHASER AND THE SOLE LIABILITY OF PerTronix WHETHER
ON WARRANTY, CONTRACT
BE LIABLE FOR MONEY DAMAGES WHETHER DIRECT OR CONSEQUENTIAL.
OR FOR NEGLIGENCE, AND IN NO EVENT WILL PerTronix
440 East Arrow Highway
San Dimas, CA 91773
909-599-5955
www.pertronix.com
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