com
N
E
G
A
T
I
V
E
B
A
T
T
E
R
Y
com
N
E
G
A
T
I
V
E
B
A
T
T
E
R
Y
INSTALLATION
Step 3. ENGINE KILL CONNECTION
For cars equipped with an alternator, the Battery Isolator needs to kill the engine by sending a signal to the
engine ECU or electronic Power Distribution Module (PDM) or by shutting down the main engine relay.
The engine kill output signal has two states:
Battery Isolator ON - 12V (0.5A max).
Battery Isolator OFF - 0V(Earth).
Make sure the ECU or PDM is able to accept this type of Engine Kill Signal. Most OEM ECUs will not be able
to accept this type of signal while most programmable Motorsport ECUs and PDMs will.
6
BROWN
BLUE
WHITE (Engine kill signal)
BLACK
GREY
TO ECU/PDM
It is also possible to use the Engine Kill Signal to control an Engine Relay/DME. Please check the
manufacturers specification before installing.
BROWN
BLUE
WHITE (Engine kill signal)
BLACK
GREY
+
ENGINE
RELAY
Maximum
current 0.5A
TO FUEL PUMPS
IGNITION
ECU
ETC
+
-
+
-
WARNING: The Battery Isolator must be fully connected before starting the engine. If the engine kill
output signal is not connected when the engine is running then damage to the Battery Isolator may
occur. (Cars without alternators do not apply).
