4 TT-1617 12/13
5.1 Route the relay end of the wiring harness
(GM90471) behind the fuel pump, behind the
sound shield ADC II panel (if equipped), and up
into the bottom of the junction box. See Figure 9.
Note: If routing the harness as outlined in
Step 5.1 does not work, pull the harness
through from the inside of the junction box
and leave the relay base end of the
harness inside the junction box.
5.2 Route the flow switch connector (P5) and leads
87A and N5 of the new harness (GM90471) on the
right side of the fuel pump, over the top the stator
shell, and underneath the catalyst to the
nonservice side. See Figure 9.
5.3 Connect leads 87A and N5 from the new wiring
harness (GM90471) to the new seawater
pressures switch (GM54744) on the nonservice
side.
5.4 On the service side, disconnect the blue
connectors from the lift pump and the existing
wiring harness (containing leads F4B/N4 that
connect to leads F4C/N3). See Figure 9 for the lift
pump location.
5.5 The connector containing leads F4 and N (from
the new wiring harness) connects to the lift pump’s
connector.
5.6 The connector containing leads F4B and N (from
the new wiring harness) connects to the existing
wiring harness.
5.7 The leads that were disconnected from the old
seawater pressure switch now connect to the new
wiring harness leads 87 and N5.
1
1. Relay end of wiring harness (route into junction box)
2. Seawater flow switch connector and leads 87A and N5
(route to nonservice side)
3. Fuel pump
4. Lift pump
5. Seawater pressure switch (GM54744)
6. Terminal ends of leads 87A and N5
7. Seawater flow switch connector
2
4
3
Nonservice Side
Service Side
5
6
7
Figure 9 Wiring Harness (GM90471) Routing
Connects to new relay in junction box.
Connects to new seawater
pressure switch on the
nonservice side.
Connects to old seawater
pressure switch leads on
the service side.
Connects to existing
harness on the service side.
Connects to existing lift
pump on the service side.
Connects to new seawater flow switch
on the nonservice side.
Figure 10 Wiring Harness (GM90471)
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