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Old 11-17-2019, 10:09 PM   #7
Joe K
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Join Date: Jul 2010
Location: Cow Hampshire
Posts: 4,175
Default Re: Exploded view of light switch

Another issue that many find is that ALL the reproduction parts for Headlights & Wiring are of the "twolight" variety. The earlier "Type H" Model A headlights & supporting switches (until about March-June 1929) are distinctly different electrically, and so far, except for Type H light sockets and plugs, have not been reproduced.

You can tell a Type H headlight switch from a TwoLight switch. The Type H switch has FOUR contacts. The TwoLight switch has THREE contacts.

Mixing an early 4 contact switch with Twolight harness/switch plate can result in the symptoms you're having.

A solution to this is offered in using a Twolight switch and Twolight Harness together and modifying the harness to light a Type H headlight. There will be one additional contact which will have to be unused.

Another solution is to modify a Twolight harness switch plate to work against a Type H switch. This may involve generation and incorporation of additional or relocated contacts.

I myself have Type H headlights and have reverted to a Type H system using this second methodology and reworked a Twolight wiring harness.

Another issue which can create problems is in the Headlight "plugs." The original wiring harnesses were based on soldered in place "bullet-ends" but all the wiring harnesses have "crimped on" bullet ends. These can get mis-placed in poor quality bullet end holders which are part of the plug system and cause shorts or intermittant lighting.

Unfortunately, the reproduction parts for the Ford Lighting System of all kinds are much in need of "quality upgrade." Cheap for these began in the J.C. Whitney era, and we still haven't gotten out of the woods on this.

Joe K
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Last edited by Joe K; 11-17-2019 at 10:21 PM.
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