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 THE FORD STARTING AND LIGHTING SYSTEM 
Can the Engine be run with the Generator disconnected from
the battery? Answer No. 136
If for any reason the engine is run with the generator disconnected from the
battery, as on a block test, or when battery has been removed for repair or recharging,
be sure that the generator is grounded by running a wire from the terminal on
generator to one of the dust cover screws in the yoke. Two strands of shipping
tag wire may be used for this purpose. Be sure that the connections at both ends
of the wire are tight. Failure to do this when running the engine with the generator
disconnected from the battery will result in serious injury to the generator.
Never ground the generator through the cut-out.
What type of Battery is used?
The Ford Starting System uses a six-volt, three-cell battery.
Answer No. 138
Hydrometer readings should be taken 
  about every two weeks to make sure 
  that the generator is keeping the battery 
  charged. To take a hydrometer reading, 
  remove the filling plugs (remove the plug 
  from only one cell at a time). Next, 
  insert the hydrometer syringe in the filler 
  tube and draw up enough of the solution 
  to float the glass bulb inside the instrument. The reading of the scale at
    the surface of the liquid (see Cut No. 26)
  gives the strength of the solution. Be 
  sure to return the electrolyte to the cell 
  from which it was taken. Following is 
  a list of the readings with their indications. The readings in parentheses
    apply to batteries used in tropical climates
  where water never freezes. Readings of 
  1.275 (1.200) or more indicate a fully 
  charged battery. Readings of less than
  1.225 (1.130) but more than 1.150 (1.080) 
  indicate complete discharge. Hydrometer 
  tests taken immediately after filling with
  water and before it has become thoroughly 
  mixed with the electrolyte will not show 
  the true condition of the battery. If the
  hydrometer reading shows the battery less 
  than one-half charged, it should be taken 
  to the nearest authorized Ford Dealer for
  recharging. 
Continued operation in a 
  less than half-charged condition is 
  injurious to the battery somewhat as running on a soft or deflated tire is
  injurious to the tire. Before replacing the battery, the cause of the discharged
  condition should be removed. It may be due
  to leaks or grounds in the car wiring or to the electric system having gctten 
  out of adjustment so that the battery is not kept supplied with the proper
  amount 
  of current from the generator. If the reading in one cell is more than 50 points 
  different from the others, it indicates that the cell is not in good order
  and the battery should be taken to an authorized Ford Dealer for attention.
  When should water be added to the Battery?
  Add nothing but pure water to the cells and do it often enough to keep the
  plates covered at all times. The solution (electrolyte) should be maintained
  at a level with the bottom of the filling tube. Distilled water, melted artificial
  (but not natural) ice and rain water, if obtained in the open country from
  a clean slate or shingle-covered roof, are generally satisfactory. All water
  for battery use should be kept in clean, covered vessels of glass, china, earthenware,
  rubber or lead. In cold weather add water only immediately before running the
  engine so that the charging will mix the water and electrolyte, and avoid freezing.
  If, for any reason, it is necessary to add acid, the battery should be taken
to an authorized Ford Dealer.
What care should be given the  Filling Plugs and Connections?
  Keep the filling plugs and connections tight and the top of the battery clean.
  Wiping the battery with a rag moistened with ammonia will counteract the effect
  of any of the solution which may be on the outside of the battery. A coating
  of heavy oil or vaseline will protect the connectors from corrosion. It is
  of vital importance that the battery is firmly secured in its supporting brackets
  at all times. If clamps are loose, the battery will shift about in the compartment
  and result in loose connections, broken cells and other trouble. If repairs
  are necessary or if the car is to be laid up for the winter, take the battery
  to a skilled service man for proper attention and storage. Do not entrust the
  battery to inexperienced or unskilled hands.
  Answer No. 137
  How are hydrometer Readings taken?
  Hydrometer Readings. (Cut No. 26)
  Answer No. 139
