Mallory Ignition ACCEL Ignition 35496 - Manual (Page 7)

ACCEL IGNITION www.accel-ignition.com 7
GENERAL RECOMMENDATIONS
Coil primary resistance must not be less than 3 ohms. Most OE style dual
fire and aftermarket single fire coils meet this requirement. Coils for the new
Twin Cam engine have low primary resistance and are not compatible.
Due to the short lengths involved on motorcycle applications, energy losses
in spark plug wires are insignificant. OE carbon core suppression cables
will deteriorate after several years. For a more durable replacement, we
suggest spiral core spark plug cables.
The ACCEL module is compatible with all modern “ground sensing”
type tachometers including H-D® OE and Autometer units. The red status
LED is internally connected to the tachometer output. If the red status LED
blinks, the tachometer output should be functional. Some early tachometers
require a high voltage trigger pulse. In this case, you will require a commer-
cially available tachometer adapter.
VOES CONSIDERATIONS
The vacuum switch (VOES) provides the vacuum advance required by
all street driven engines. Additional advance under low manifold pressure
conditions improves idle stability and fuel economy. Most 1980 and later
motorcycles are equipped with a OE VOES. Without vacuum advance at idle
and part throttle, thermodynamic efficiency is reduced and engine tempera-
tures increase significantly.
The VOES is normally open. At low manifold pressure (or manifold
vacuum greater than about 5 inch-Hg), the VOES grounds the purple/white
wire and causes the ACCEL module to generate additional timing advance.
The green VOES LED illuminates whenever the VOES input is active (timing
advanced).
The use of a VOES is required for proper operation of the ACCEL module.
If your motorcycle did not include an OE VOES, you can use H-D® VOES P/N
26566-91 for stock or mildly modified engines.
TROUBLESHOOTING FLOWCHART
Follow the troubleshooting flowchart shown on the next page. Experience
has shown that most units returned for warranty are OK and another prob-
lem, such as a defective coil, is later identified.
TROUBLESHOOTING TIP: If you are installing an internal (nose cone) ignition for the first time and the
engine will not start, the most likely problem is improper static timing. Make sure that the front piston
is at TDC on the compression stroke and not on the exhaust stroke.