Cleaning. - TM-10-3930-622-140109

b. Cleaning.

harness, and general damage to the harness has not

(1) Wash battery by flushing freely with water.

occurred, as would be the case if one wire burned, repair as

Use brush if necessary to remove crusted deposits.

follows: a. Disconnect defective wire at both ends and clip

Brush terminal posts to bright finish without removing

off where it enters harness.

metal.

b. Select suitable length of correct gage and type wire

(2) Wash battery cables in hot water to remove

for replacement.

dirt and corrosion. Wire brush inside of battery terminals

c. Install wire terminals, equivalent to those used on the

to bright finish.

original wire, dress the replacement wire neatly along the

outside of the loom parallel to the original wire (tie with

c. Installation. Reverse a above. Tighten battery

lightweight cord at four inch intervals) and connect new wire.

strap nuts only tightly enough to hold battery snugly. do

not overtighten .

6-45. TAILLIGHT

a. Removal.

d. Test.

(1) Remove screws from corners of radiator cover

(1) Remove cell caps, and test specific gravity of

plate and raise cover plate for access to taillight wiring and

electrolyte in each cell with battery hydrometer. All cells

attaching parts.

should read within 10 points of each other. Reading of

1.280 indicates full charge; 1.220 indicates about 50%

(2) Disconnect wiring by unplugging leads at

charged; 1.160 indicates practically complete discharge.

terminal lugs.

Variations in readings among cells indicate the low

reading cells are defective, and battery must be

(3) Remove nut and washer securing taillight

replaced.

assembly and remove taillight assembly from radiator cover

plate.

NOTE

b. Disassembly. Remove screws securing lens and remove

Readings above apply at electrolyte

lens and gasket from housing. Remove lamp by pressing it

temperature of 80 deg F.

At different

down into socket and turning it to left until it can be lifted

temperatures, add .004 to reading for each 10

free.

deg F above 80 deg F; subtract .004 from

actual reading for each 10 deg F below 80

6-46.

STOP LIGHT SWITCH

AND

INDICATOR

deg to obtain value for comparison with

TRANSMITTER REMOVAL.

figures given in (1) above. Also see figure 5-

11.

a. Disconnect electrical lead or leads at unit to be removed.

(2) With fully charged battery installed, test

NOTE

cables and connections as follows:

Before removing engine temperature transmitter

drain enough coolant to bring level' below tapped

(a) Contact positive battery post (do not touch cable

mounting hole. Before removing any of the units

terminal) with positive lead of voltmeter calibrated in

tenths of a volt. Contact negative voltmeter lead to

listed, for replacement, have the replacement unit

starter terminal of starter.

ready for immediate installation.

(b) Crank engine. Note voltmeter reading while

cranking. Any reading in excess of 0.2 volt indicates

b. Unscrew hourmeter switch, engine oil pressure

electrical resistance due to a bad cable or connection.

transmitter, engine temperature transmitter or stop light

switch as required. None of these units is subject to

engine with voltmeter positive lead, and voltmeter

disassembly or repair.

negative lead touching battery negative post. Voltmeter

reading greater than 0.2 volt indicates bad cable or

6-47.

FUEL GAGE TRANSMITTER REMOVAL a.

connection.

Remove five screws and washers from flange of transmitter

atop fuel tank. Remove gasket. The transmitter is not

6-44. WIRING HARNESS. Repair of the wiring harness

subject to disassembly.

is limited to isolating shorted and open circuits and using

good commercial practice in their repair. Refer to the

6-48. NEUTRAL SAFETY SWITCH REMOVAL.

wiring diagram (figure 6-20) and conduct a systematic

Disconnect two electrical leads at switch. Remove two

inspection using an ohmmeter to isolate the trouble.

screws, nuts and washers attaching switch to truck, and

take switch and its mounting insulator from truck. The

Remedy the trouble by splicing leads where required and

neutral safety switch is not a reparable item. Replace a

applying electrical tape to prevent short circuits from

defective

switch

with

new

one,

occurring. If failure occurs in one of the wires in the