Mallory Ignition Mallory UNILITE DISTRIBUTOR - Manual (Page 5)

NOTE: IF YOU ARE USING A CD IGNITION BOX, YOU MUST BYPASS IT BEFORE PERFORMING THIS TEST!
®
UNILITE ® TEST PROCEDURE
1) Remove the cap and rotor. Turn the ignition ON and test
voltage at the NEGATIVE side of the coil (black lead of
meter to ground and red lead of meter to coil NEGATIVE
post). Voltage should read 12 volts.
2) If battery voltage is present, place a credit card, driver’s
license, business card or similar and block the photo
optics of the module. The voltage should drop to 2 volts
or less (1 to 2 volts). If this test is positive, then the
module is working.
3) If the test results are as follows:
a) Voltage does not drop, module is open and must
be replaced. This may have been caused by a power
surge, high resistance in the plugs or plug wires, or
improper ground. Possible charging system load
dump.
b) Voltage always stays below 2. 0 volts. The module
has been spiked by high voltage or amperage, lack
of ballast resistor, or improperly wired.
c) Voltage only drops to 3-4 volts could produce a weak
spark.
Possible causes are:
•
Faulty charging system (stuck or shorted regula-
tor/alternator)
• Faulty starting system (starter drag)
• Non-suppression spark plug wires (copper or stain-
less core wires). Spark plug wires must be carbon
core or spiral wound plug wires.
• Large amperage alternator
• High amp stereo equipment
• CB radio
• Direct shorts in the ignition or electrical system
• Trying to start motor with battery charger hooked
up
• Welding on the vehicle with the distributor hooked
up (disconnect 3-wire plug of the distributor before
welding)
• Faulty or improper ground of module
If you must replace the module, replace it with Mallory
Part No. 605.
If after completing the test and you are not sure of the re-
sults, 216-688-8300 EXT 5
FIGURE 2
FIGURE 1