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250 Electrical System
CAUTION
If there are other ground cables con-
nected to the battery (such as engine
ECU, etc.), disconnect those ground ca-
bles first, then remove the main battery
ground cable. Electronic modules may
be damaged when additional grounds are
connected/disconnected without the
main battery ground connected. Discon-
nect the main battery ground last.
Before welding on the vehicle, electrical
power needs to be disconnected and some
components must also be disconnected:
•
Disconnect both the negative (-) and
positive (+) battery cables. Disconnect
the negative cable first. Reconnect the
positive cable first.
•
Disconnect engine/starter ground from
the chassis. This connection is located
outside the left hand frame rail in the
engine compartment.
•
Disconnect the power harness and ve-
hicle interface harness at the engine
electronic control unit (EECU).
•
If the vehicle is equipped with systems
that have their own ECUs (such as the
vehicle ECU (VECU), ABS system,
air bag or some transmission systems),
disconnect each ECU at their electrical
connection.
•
Disconnect the electrical connections
at the rear of the instrument cluster.
•
Reposition or shield any parts that
would be damaged by high
temperatures.
T8006862