Mallory Ignition Module 605_609 - Manual (Page 6)

NOTE: IF YOU ARE USING A CD IGNITION BOX, YOU MUST BYPASS IT BEFORE PERFORMING THIS TEST!
®
MAGNETIC BREAKERLESS
TEST PROCEDURE
(1) Remove cap and rotor. Turn ignition ON and take a
voltage reading at the POSITIVE (+) side of the coil
(black lead to GROUND and red lead to coil
POSITIVE + post). The voltage should read about
6 volts.
(2) Line up reluctor and pick-up as shown in Figure 1. If
battery voltage is present, take a flat blade screw driver
and short between the pick-up and reluctor blade
(Figure 2). The voltage should go up to 12 volts mo-
mentarily and then go back down to battery voltage. If
it does, then the module is good.
(3) If the test results are as follows:
(a) Voltage does not go up, module is bad and must
be replaced. May have been caused by power
surge, high resistance in the plugs or plug wires,
or improper ground. Possible charging system
load dump.
(b) Voltage always stays below 6 volts. Module has
been spiked by high voltage or amperage, lack of
ballast resistor, or improperly wired up. Possible
causes are:
(1) Faulty charging system (stuck or shorted
regulator/alternator)
(2) Faulty starting system (starter drag)
(3) Non suppression spark plug wires (copper or
stainless core wires). Need to be carbon core
or spiral wound plug wires.
(4) Large amperage alternator
(5) High amp stereo equipment
(6) CB Radio
(7) Direct shorts in the ignition or electrical
system
(8) Trying to start motor with a battery charger
hooked up
(9) Welding on the vehicle with the distributor
hooked up (disconnect 3-wire plug of the
distributor before welding)
(10) Faulty or improper grounding of module
If you must replace the module, use Part No. 609.
If you are not sure of the results after testing the module,
call Mallory Customer Service at (775) 882-6600.
Rev. Date: 07/16/02
FIGURE 2
FIGURE 1
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