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Old 01-08-2012, 09:14 PM   #1
kiddcom
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Default Model A Light Switch

I have a 1928 Model A and we have performed a little maintenance over the week-end and ran into a little reassembly question. Our wiring diagrams seems to show that the Light Switch should be a 4 position switch (low beam, high beam, parking, off). Unless the switch is toast, there seems to be only 3 positions. When the lights were reassembled and the wiring color codes checked and rechecked, we ONLY have low beam in 1 position, off, parking. Now the question. What is the correct function of the Light Switch (by position)? We have a replacement wiring harness, but the color codes seem to match original.
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Old 01-08-2012, 09:58 PM   #2
Peter J
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Default Re: Model A Light Switch

It should be high beam 4 oclock, low beam 5 oclock, off at 6 oclock and parking at 7oclock. At least on mine it is which is a 29.
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Old 01-08-2012, 10:01 PM   #3
Ron in Quincy
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Default Re: Model A Light Switch

You have the 2nd generation light switch; it works just like the very early light switch except it has a bail to hold the lower cover.

The correct headlight bulbs were 21/ 3 Candle power; you do not have a high beam, that is why only 3 positions: park to the left, off in the center, driving light to the right.

Your headlights, if you have the correct harness, should only have two wires to each headlight. The headlight conduits and their connectors should be smaller, and also the exit holes in the rediator shell should all be the same size as the holn wire hole.

Sorry, do not have any pictures to post.

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Old 01-09-2012, 12:16 AM   #4
columbiA
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Default Re: Model A Light Switch

If your wiring diagram shows the 4 position switch,thats the diagram for 29-31.The 28s use a different switch & a different bakelite contact disc on the light harness.
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Old 01-09-2012, 01:04 AM   #5
Tom Wesenberg
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Default Re: Model A Light Switch

If your new harnes came with the contact plate already attached it will be for the 4 position lights, 1929-31 Twolite system. You will ned to unsolder your original contact plate from the old harness and use it with the new wires. The 1928-early 29 contact plate has 4 brass contacts located at 12 o'clock, 4, 6, and 8 o'clock. The twolite system has 3 groups of 3 contacts equally spaced around the plate.
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Old 01-09-2012, 01:44 AM   #6
Tom Wesenberg
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Default Re: Model A Light Switch





Here you can see how the switches and contact plates differ from the fluted headlights and the Twolite lamps, with the top picture being the later style Twolite system. The top right cover is the longer cover used in 1930-1. You can see two styles of contact plates used with the Twolite switches, with the one of the right with 9 brass contacts being the more common one by far.

BTW, for those wondering how the Caswell copy cad plating system looks, these are parts I plated using my Caswell kit.
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