11-10. CAB HEATER WIRING HARNESS REPLACEMENT (Cont).
Step 6 only applies to trucks equipped a with cargo compartment heater.
Disconnect harness connector (18) from cargo compartment heater connector.
Disconnect wiring harness (1) at switch connector (21) and engine coolant heater connector
(22). Cut and discard all straps securing wiring harness to fuel lines (20). Carefully pull wiring
harness through grommet (17) into engine compartment and remove.
If installing relay, perform step 6.
Position wiring harness (1) in engine compartment. Carefully push wiring harness through
grommet (17) up to white band on wiring harness. Connect wiring harness at switch connector
(21) and engine coolant heater connector (22). Route wiring harness along fuel lines (20) and
install new straps,