585 Datasheet, PDF (4/12 Pages) Mallory performance club – IGNITION CONTROL

Engine Run-On
If your engine continues to run even when the ignition is turned off,
you are experiencing engine run-on. Usually, older vehicles with an
external voltage regulator are susceptible to this condition. Because
the HYFIRE^® V Ignition Control receives power directly from the bat-
tery, it does not require much current to keep the unit energized. If you
are experiencing run-on, it is due to a small amount of voltage going
through the charging lamp indicator and feeding the small red wire
(even if the key is turned off).
Early Ford and GM: To solve the run-on problem, a diode is supplied
with the HYFIRE^® V Ignition Control. By installing this diode in-line of
the wire that goes to the charging indicator, the voltage is blocked
from entering the HYFIRE^® V Ignition Control. Figure 4 shows the
proper diode installation for early Ford and GM vehicles.
NOTE: Diodes are used to allow voltage to flow only one way.
Make sure the diode is installed facing the proper direction, as
shown in Figure 4.
Ford: Install the diode inline to the wire going to the #1 terminal.
GM: Install the diode inline to the wire going to the #4 terminal.
GM 1973-83 with Delcotron Alternators
GM Delcotron alternators use an internal voltage regulator. Install the
diode inline on the smallest wire exiting the alternator (see Figure 5A).
It is usually a brown wire.
Most other applications: To eliminate run-on, connect a Chrysler dual
ballas resistor as shown in Figure 5B.
Misses and Intermittent Problems
Experience has shown that if your engine is misfiring or hesitating at
higher RPM, it is usually not a HYFIRE^® problem. Most common causes
include a coil or plug wire failure, arcing from the cap or boot plug to
ground or spark ionization inside the cap. Perform the following checks:
• Inspect the plug wires at the cap and at the spark plug for a tight
connection. Visually inspect for cuts, abrasions, or burns.
• Inspect the primary coil wire connections. Because the HYFIRE^® V
Ignition Control receives a direct 12 volt source from the battery,
there will not be any voltage at the coil positive (+) terminal, even
with the key turned on. During cranking, or while the engine is run-
ning, very high voltage will be present and no test equipment should
be connected.
WARNING: Do not touch the coil terminals during cranking or
while the engine is running.
• Make sure that the battery is fully charged and the connections are
clean and tight, especially if you are not running an alternator. If the
battery voltage drops below 10 volts during a race, the HYFIRE^® V
Ignition Control output voltage will drop.
• Is the engine running lean? Inspect the spark plugs and the entire
fuel system.
• Check all wiring connections for corrosion or damage. Remember
to use proper connections followed by soldering, then seal the con-
nections completely.
If the items above are ok, use the procedure on Page 5 to test the
ignition for spark. Mallory also offers an Ignition Tester (PN 28357)
that allows you to check the entire ignition system while it is installed
in the vehicle. This tool can also be used to check RPM limiters, RPM
activated switches, and shift lights.
TACHOMETER COMPATIBILITY LIST
Aftermarket
Tachometer
White Wire
Trigger
Magnetic Trigger
Connector
Autogage
29074
29078
Autometer
—
—
Ford Motorsport
—
—
Moroso
—
—
Stewart
29074
29078
S.W. & Bi Torx
—
—
Sun
29074
29078
VDO
8910
29078
AMC (Jeep)
29074
29078
Chrysler
29074
29078
Ford (Before 1976)
29074
29078
Ford (After 1976)
29074
29078
GM
Bypass in-lin
Bypass in-line
filter
filter
Imports
29074
29078
12 VOLT
IGNITION SWITCH
SMALL RED
FROM HYFIRE^® V
FIGURE 3
FROM POINTS OR
AMPLIFIER
WHITE WIRE FROM
HYFIRE^® V
CHRYSLER DUAL
BALLAST RESISTOR
VOLTAGE
REGULATOR
1234
FIGURE 4
FOR FORD VEHICLES—
ATTACH DIODE TO
#1 TERMINAL
FOR EARLY GM VEHICLES—
ATTACH DIODE TO
#4 TERMINAL
TO CHARGING LIGHT
1A-100V DIODE
SPLICE HERE
DELCOTRON
ALTERNATOR
SPLICE HERE
1A-100V DIODE
FIGURE 5A
TO CHARGING LIGHT
HYFIRE^® V SMALL RED
CHRYSLER DUAL
BALLAST RESISTOR
SWITCHED 12V
TO ENGINE/CHASSIS
GROUND
FIGURE 5B
4
MALLORY IGNITION 550 MALLORY WAY, CARSON CITY, NV 89701