Bulletin HY25-1380-M1/US
Owner’s Manual
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA
18
GMT P.T.O. Connector
Owner’s Manual
Allison World Transmission P.T.O.s
GMT C Series Trucks
For model year 2003 GM C Series 4500, 5500, 6500, 7500 and 8500 trucks may be equipped with the
Allison World (MD) transmission. In these vehicles GM Truck has integrated a P.T.O. connector, located
in the right hand engine compartment area. A Power Take-Off switch has also been incorporated into
the GM dash panel to control P.T.O. operation. With the P.T.O. option ordered on the truck, the P.T.O.
connector and in-dash switch simplify the interface for the body builder.
In order for the customer to utilize the full capability of the P.T.O./transmission, Chelsea has design a
wiring harness that must be used between the GM P.T.O. connector and the Chelsea Power Take-Off.
These are for P.T.O. Non E.O.C. applications only.
On the Allison World (MD) transmission the P.T.O. drive gear is engine driven. The wiring harness is
not “required” for the Power Take-Offs listed on the chart, but must be used if the GM supplied in-dash
P.T.O. switch is to be utilized.
See wiring harness part number 379926 for the 277, 278 and 859 Series Power Take-Offs.
2003 GM “C” Series Wiring Harness for 277, 278 and 859 Series
Part Number 379926
10' 6"
To GM P. T.O.
Connector
Black Wire Loom
Connect to
Solenoid Valve
Connect to
Pressure Switch
Parker
lchelsea
To Next Page
Loading...