MSD 5520 Street Fire Ignition Control Installation - Manual (Page 11)

INSTALLATION INSTRUCTIONS 11
S T R E E T F I R E • W W W . S T R E E T - F I R E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
1A-400V DIODE
TO CHARGING
LIGHT
SPLICE HERE
OR
DELCOTRON
ALTERNATOR
FORD VEHICLES
ATTACH DIODE TO
TERMINAL "1"
EARLY GM VEHICLES ATTACH DIODE TO TERMINAL "4"
1
2 3 4 SMALLER OF THE 2-WIRES
DIODE
WIRE LOOM
GM 2-WIRE ALTERNATORS
Figure 5 Installing the Diode to fix Run-On.
Most other applications: On other applications
where engine Run-On is experienced, a Resistor
can be put in-line to the Street Fire's small Red
wire (Figure 6). This resistor will keep voltage from
leaking through to the Street Fire unit.
STREET FIRE
Figure 6 Wiring the Dual Ballast Resistor for Run-On.
MISSES AND INTERMITTENT PROBLEMS
Experience at the races has shown that if your engine is experiencing a miss or hesitation at higher rpm, it is usually
not directly ignition. Most probable causes include a coil or plug wire failure, arcing from the cap or boot plug to
ground or spark ionization inside the cap. Several items to inspect are:
• Always inspect the plug wires at the cap and at the plug for a tight connection and visually inspect for cuts,
abrasions or burns.
• Inspect the Primary Coil Wire connections. Because the Street Fire is a Capacitive Discharge
ignition and it 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 running, 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. If you are not running an alternator
this is an imperative check. If the battery voltage falls below 10 volts during a race, the CDI output voltage will drop.
• Is the engine running lean? Inspect the spark plugs and complete fuel system.
• Inspect all wiring connections for corrosion or damage. Remember to always use proper connections followed
by soldering and seal the connections completely.
If everything checks positive, use the following procedure to test the ignition for spark. MSD also offers an Ignition
Tester, PN 8998. This tool allows you to check your complete ignition system while it is in the car as well as the
operation of rpm limits, activated switches and shift lights.