Quote:
Originally Posted by duke36
Ford Service Bulletins ?
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The January, 1928, Ford Service Bulletins have the procedure for the first type of headlights that Ford used, the ones with the vertical fluted lenses. Most guys don't use these lights and lenses on their cars today because they only give "high beam" and "parking lights". They don't give any dipped light for driving without blinding oncoming drivers. The instructions for these lights align the top of the bright part of the headlight beam at a line
33" up from the ground and 15" left and right of the centerline of the car. The face of the lamps is
25 feet from the wall.
Later, in the February, 1929, Service Bulletins, they say to aim the fancy new Two-Lite headlights with the bright beam areas
37" above the ground and centers 15" left and right of the centerline of the car (also measured 25 feet from the wall). These are the type lights that most Model A owners use in their car because they have a Low Beam that you can drive in traffic without blinding others. You aim the High Beam properly and the Low Beam is automatically correct.
That is why you are finding conflicting information about aiming the lights. There were 2 different light systems used on the Model A, with different aiming levels.
I don't know where the 39-1/2" number came from. AA trucks, maybe?
Hope this helps.