(3)  
The left center tank wiring harness is shown in Fig. 9 (Sheet 4).

 (4)  
The right center tank wiring harnesses are shown in Fig. 9 (Sheet 5).

 (5)  
The left main tank wiring harnesses and the right main tank wiring harnesses are shown in Fig. 9 (Sheet 6).

 (6)  
The HI-Z/LO-Z connector and densitometer connector are shown in Fig. 9 (Sheet 8).

 (7)  
A simplified schematic for the LO-Z and HI-Z wiring for the left main fuel tank is shown in Fig. 9 (Sheet 9).

 (8)  
The term LO-Z means low impedance.

 (9)  
The term HI-Z means high impedance.

 (10)
 The airplane wiring harness is found external to the fuel tank.  The airplane wiring harness begins at the processor connector and ends at the HI-Z/LO-Z plug or densitometer plug. The HI-Z/LO-Z plugs are found on the dry side of the front spar of the fuel tank. The densitometer plugs are found on the dry side of the rear spar.

 (11)
 The tank wiring harnesses are installed in the applicable fuel tank. The tank wiring harness begins at the HI-Z/LO-Z receptacle or densitometer receptacle and ends at the wiring terminals on the tank units and compensator or densitometer.

 (12)
 The HI-Z/LO-Z plug connects with the HI-Z/LO-Z receptacle of the tank wiring harness.

 (13)
 The densitometer plug connects with the densitometer receptacle of the tank wiring harness.

 (14)
 The tank wiring harnesses are installed in their applicable fuel tanks.

 (15)
 The processor (FQPU) sends an excitation signal to the tank units and compensators through the LO-Z wiring.

 (16)
 The HI-Z wiring carries the return signal from the tank units and compensators to the processor.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 011-999 ú

 28-41-00
 ú CONFIG ú 11 Page 16 ú Sep 28/00

A
757
MAINTENANCE MANUAL

EDGE
TANK WIRING HARNESS LOCATION - LEFT WING
Fuel Quantity Indicating System Wiring Figure 9 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 011-999 ú

 28-41-00
 ú CONFIG ú 11 Page 17 ú Sep 28/00

A

757
MAINTENANCE MANUAL

TANK WIRING HARNESS LOCATION - RIGHT WING

Fuel Quantity Indicating System Wiring
　
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