12v switched – (single pink wire), Wire harness main connector, Twelve_volt_switched – Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Transmission Control Users Manual User Manual
Page 7: Harness_main_connec tor
Bigstuff3 GEN3 Transmission Control Manual
TOSS Sensor
Terminate this connector to the stock speed (TOSS) sensor on the transmission. The location on the
transmission where this termination should be made can be seen by clicking on
.
12V Switched – (Single pink wire)
A secure connection must be made to a switched 12V supply. The best and in most cases the only
source of a switched 12V supply is at the vehicle fuse block. The ECU must have a “live” 12V supply
during cranking. If the 12V supply does not stay live, during cranking, the ECU will not function. A
simple way to determine if a live 12V supply exists
during cranking is to check it with an inexpensive
voltmeter. Securely fasten the voltmeter’s red (+
positive) wire to the ignition input on the fuse block.
Secure the voltmeter’s black wire (- negative) to a
ground location on the fuse block or another adequate
location. Once the voltmeter connections are made, crank the engine. The voltage meter should
indicate an output voltage of between 8V to 14 volts. If the output voltage is below 8 volts, check to
make sure the battery is fully charged and all the cells of the battery are functioning properly.
Note: If a battery with both 12V and 16V cells is being used, the switched ignition (Vsw)
must
to
tied to the same voltage rail as the main battery connections are connected to. Do not connect the
ECU main cables to the 16V rail and have Vsw connected to +12V.
This will damage the ECU and
void the warranty.
Wire Harness Main Connector
The 30-way harness side main connector mates with the GEN3 ECU header connector marked with
“Transmission”. This connector will only fit in one direction, but must be mated with the ECU
header connector marked “Transmission”.
Note:
It is essential that the transmission wire harness main connector be installed in the correct
header connector location on the ECU! Installing the transmission harness main connector to
the incorrect header location on the GEN3 ECU will damage the ECU and void the warranty!!
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