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EFV-8 Club Forum / General Ford Discussion / Wire Size Question

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Drbrown

02-19-2015 @ 6:35 PM

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len47merc and Flathill: Dug thru my books and computer files (I copy tons of items off the forums) and found where that wiring diagram came from. It's in a bright red-colored hard bound book about 5" x 7" that I bought off eBay titled "Ford V8 Service Bulletins, 1941-1948 Complete" .... obviously not specific to earlier Fords but none-the-less about the flathead world. A number of Ford parts houses sell it. Its a compilation (approved by Ford) of Ford "Dealer Service Bulletins" authored by Dan Post dated 1977 copyright 1988 by Lincoln Publishing containing about 370 pages.

That particular wiring diagram is on page 168; there are other similar ones for different engines on pages 166, 170 and 172.

Looking at different (6v) diagrams, the only #10 wire seems to be btwn generator, starter solenoid and circuit breaker; Balance of circuits use #14 or #16 gauge.

I've been gradually rewiring my 12v '47. The car long ago left the concourse neighborhood, and while some may feel over-sizing wires is wasteful, I eliminated dim headlights and like the snappy electric system.

This message was edited by Drbrown on 2-19-15 @ 6:41 PM

Whifty

02-19-2015 @ 5:50 PM

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http://www.amazon.com/Ford-Service-Bulletins-1941-1948-Complete/dp/0911160345

Flathill

02-19-2015 @ 8:08 AM

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I'm also just needing to replace some wires for my 35 ford as I trouble shoot the system. Someday I will replace with the new harnesses as my work progresses.
Thank you Dan for the Wire Gauge Diagram.

len47merc

02-19-2015 @ 5:11 AM

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Dan - this is great info. What manual/document is this from and are you aware if copies, reprints or originals still available? I'd like to add it to my reference library if I could obtain it. Thanks - appreciate your posting this.

Steve

Drbrown

02-18-2015 @ 6:19 PM

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tan35coupe .... as an informative guide, attached is a wiring diagram for 1945-47 Fords from a Service Manual that shows a tabulation of both the wire gauge and color for each circuit. I say guide because i.e. a wire serving a tail light in 1935 most likely carried the same current as a 1945 Ford. As the diagram shows, GENERALLY in 6 volt Fords main feeders were #10, subfeeders #14, and lessor circuits like tail and dome lights are #16. Special circuits for i.e. heaters and cigar lighters are obviously larger gauge. This data could save you some head scratching. Dan

juergen

02-18-2015 @ 8:45 AM

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Here is another approach to determining wire size. If you can expect your maximum current draw, this site whill tells you wire size based on the current requirements; www.offroaders.com/tech/12volt-wire-gauge-amps. I think I saw the same list at Narraganset wiring. Note that it says for 6 volt applications, a wire gauge 2 sizes larger should be used. This is not for current carrying purposes but to reduce the voltage drop through the wire. Of course you need to know the current value or as 42 wagon says measure what you have and for instruments 14 gauge is a good choice.

42wagon

02-17-2015 @ 4:46 AM

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I think you will find that most of the wiring is 14 gauge with various color coded insulating jackets. There are a few heavy duty wires but it's pretty simple.
If you have the wiring in the car why not measure what you have. Measure the wire of course not the jacket.

Drbrown

02-16-2015 @ 6:33 PM

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I'm sending you a PM.

ken ct.

02-16-2015 @ 4:52 PM

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Furthermore I don't think anybody would know the wire size of all the diff wires in a ford chassie and the proper color and length of them. OMO. ken ct.

ken ct.

02-16-2015 @ 4:49 PM

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I don't think those specks are available anywhere personally. And I agree with your second paragraff on the subject. ken ct.

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