S 865-005
 CAUTION: DO NOT APPLY ELECTRICAL POWER WITH AN OPEN CIRCUIT BETWEEN THE
_______ TANK UNITS AND THE FUEL QUANTITY INDICATORS. TANK UNITS WITH OPEN CIRCUITS MOVE THE QUANTITY INDICATOR POINTERS AGAINST THE STOP. CONTINUOUS OPERATION CAN CAUSE DAMAGE TO THE INDICATOR CLUTCH.
 (3)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) EP GND FUELING
 2) QTY

 S 035-006
 CAUTION:_______BE CAREFUL WITH THE CONNECTOR PINS AND SOCKETS. THE CONNECTOR RECEPTACLE IS PART OF THE TANK WIRE HARNESS. IF THERE IS DAMAGE TO THE RECEPTACLE, IT IS NECESSARY TO REMOVE THE ASSEMBLY.
 (4)  To test the equipment in the No. 1 tank or the No. 2 tank, at the wing front spar, remove the applicable bussing plug from the bulkhead receptacle (AMM 28-41-41/401).
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 S 035-025
 (5)  
AIRPLANES WITH A CENTER TANK BUSSING PLUG ON THE REAR SPAR; To test the equipment in the center tank, remove the center tank bussing plug from the bulkhead receptacle (AMM 28-41-21/401).

 S 035-028

 (6)  
AIRPLANES WITHOUT A CENTER TANK BUSSING PLUG ON THE REAR SPAR; To test the equipment in the center tank, disconnect the connector (D886) on the rear spar of the center tank (WDM 28-41-01).

 NOTE: With this test, it is only possible to measure the total
____ capacitance of the two tank units (connected in parallel) and the capacitance of the compensator. This is almost the same data found with the task, "System Test - Fuel Quantity Indicating System" (AMM 28-41-02/501). The only difference is that the airplane wiring from the flight compartment to the rear spar is removed from the circuit with this test.
 S 485-007
 (7)  
Connect the adapter plug on the test harness to the tank and compensator unit receptacle (Fig. 501).

 S 485-018

 (8)  
Install the two bolts to attach the adapter plug.

 S 485-008

 (9)  
Connect the system tester to the test harness (Fig. 501).

 S 715-009

 (10)
 Measure the insulation resistance of each tank unit and compensator unit.

 NOTE: Resistance must not be less than the quantity shown in
____
 Fig. 502, Table A.

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A 737-300/400/500MAINTENANCE MANUAL

Tank Unit and Compensator Unit Test Connections
Figure 501

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A

737-300/400/500
MAINTENANCE MANUAL

COMMON HI-Z WIRE.
Tank and Compensator Unit Capacitance and Resistance Values
Figure 502 (Sheet 1)

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C98365
A 737-300/400/500MAINTENANCE MANUAL

Tank and Compensator Unit Capacitance and Resistance Values
Figure 502 (Sheet 2)

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