What is the difference
between Standard and Ballast ignition systems ?
A Standard 12
Volt ignition has a standard ignition coil that produces a full power
spark at 12 volts.
A Ballast ignition has a ballast coil that produces a full power spark
at a reduced voltage , the voltage is dropped by placing a ballast resistor
or a resistor wire in the live feed to the coil . The coil will have a
second feed running from the starter solenoid ,this will supply a full
12 volts on cranking giving the coil 125% the voltage it needs enabling
a stronger spark at start up .Once the car is running the 2nd feed is
cut and the coil will be powered by a reduced voltage .
How can I tell if I have a standard or ballast system ?
Most British cars had a standard ignition up to early 1970s when replaced
with the ballast system .
A standard system will only have 1 wire on the + side of coil.( Not including
any suppresser wires )
A Ballast system will have 2 feeds on to the + side of coil .( not including
any suppresser wires )
How can I tell if I have
the correct coil ?
If the coil does not have standard or ballast written on the front you
will need to test with a volt meter .
Set meter to Ohms . test between + and - . A standard coil will read around
3 Ohms a Ballast coil will read around 1.5 Ohms .
I want to fit a AccuSpark
. Does it matter if I have a standard or ballast coil ?
The AccuSpark will work with both Standard or Ballast
coils . But requires
a Ohms resistance of not less than 1.4 Ohms .
If the resistance falls below this it will cause the unit to run hot and
reduce overall life .
Can I change from a ballast to standard coil ?
To replace a Ballast coil with a standard coil is quite simple . If you
have a visible resistor you just need to bypass and connect the live feed
direct to the coil .
If you have a ballast wire this may be more difficult to identify . This
may be a wire from the ignition key to coil or may just be a part of the
wire . Normally the ballast wire will have a unique colour in the loom
to make it easier to identify . If you are unsure just run a full wire
from the Ignition key to the + side of the coil .
I need to set a points gap is the Electronic ignition any better ?
coil needs to charge between each spark ,it does this while the points
are closed and creating a circuit .As the distributor turns it opens and
closes the points . If we set the points gap to big the points will only
be closed for a short time and may not be long enough for the coil to
charge . If we set the points gap to small the points will be closed for
to long and the coil will become saturated . The
AccuSpark Ignition completely does away with points and condenser . It
has no moving parts once fitted it will require no maintenance of any
What is Dwell ?
The Dwell Angle is the degrees of rotation that the points are closed
divided by the number of cylinders .
i.e. a 4 cylinder car will have 90 degrees of rotation for each cylinder
if the points are open half the time the dwell would be 45 degrees. When
points are fitted this requires regular checking for correct running .The
AccuSpark ignition completely does away with points and condenser and
fully handles dwell time .
What happens if my Ignition fails .
If you are unfortunate to have a failure . As the
unit requires no modification to wiring or distributor the points can
be retro fitted at any time .
The AccuSpark Ignition comes with a 12 month warranty . We also supply
spare rotors and triggers .