41
AeroVee 2.1
Rev Z. 01/14/2015
Sonex Aircraft
LLC
© 2014 All Rights Reserved
MAGNATRON IGNITION WIRING
Parts Required
__ Spark Plug Boots, Qty. 4, ACV-P01-23
__ Dual Pole, Single Throw Switch (not supplied)
Magnatron Wiring
The Magnatron ignition
should be controlled by a sin-
gle Dual Pole, Single Throw
(DPST) toggle switch.
important: Aircraft-style
key switches (off-Left-
Right-Both-Start) may
not work, depending on
how they are internally
wired. Sonex Aircraft LLC
is unable to assist on any
installation with this type of
switch.
important: The dpST
switch must be installed
in the panel in a manner
that assures that when
the switch is in the down
("off") position, its contac-
tors are closed, grounding
the p-Leads to the air-
frame and disabling the
magnatron ignition.
MAGNATRON IGNITION SCHEMATIC
This DPST switch would
have a P-lead from each
Magnatron attached to the
top terminals, and wires to
ground attached to the lower
terminals. Your switch may
vary.
Magnatron Circuit Basics
The magnatron is a very simple ignition system, however,
understanding the circuit wiring is often confusing. Unlike
most other electrical devices, when the switch is "Off" the
Magnatron circuit is
closed
and the Magnatrons are
disabled
.
When the switch is "On" the ground path is
open
and the
Magnatrons become
operational
.
Switch "Off", Mags are "Off"
Switch contacts are closed, completing the "P-Lead"
ground path to the airframe. Magnatrons will not fire.
Switch "On", Mags are "On"
Switch contacts are open, disrupting the "P-Lead" ground
path to the airframe. Magnatrons are "hot" and will
generate a spark. Note: Removing the "P-Lead" from the
Magnatron is the same as turning the switch "On".
Mag Switch
"P-Lead"
Magnatron
Ground wire between Magnatron
body and engine.
Wire from Mag switch
to airframe ground.
Magnatron Circuit Basics
To check for proper switch installation:
__ A. Place the switch in the down ("Off") position.
__ B. Place an ohmmeter across a pair of the switches' ter-
minals. If there is no resistance (0 ohms) between the
terminals, the switch is properly oriented in the panel.
If the resistance is infinite, the switch is "On" and needs
to be rotated 180-degrees in the panel for proper instal-
lation.
