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EFV-8 Club Forum / Light Commercial Truck Discussion / Wiring

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Discussion Topic: Wiring -- page: 1 2 3

TomO

07-02-2013 @ 7:40 AM

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One mistake in over 5,000 posts is a pretty good record. I wish that I was that accurate.

Tom

supereal

07-01-2013 @ 4:14 PM

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I haven't seen a truck with two horns without a relay. The single horns usually had two wires, one to the battery source, and the other to the horn button, which provides ground. Horns draw heavy current, and two need the relay. Much Ford literature says car horn relays began in 1939, but I have seen them on earlier models. The '38 had them, but the '37 did not. In looking at wiring diagrams, I agree that one horn trucks did not have a relay. I stand corrected.

TomO

07-01-2013 @ 7:58 AM

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Here is a link to the wiring diagram and schematic for your 49 pickup. It does not show a horn relay being used.

http://www.vanpeltsales.com/FH_web/flathead_drawings_electrical.htm

Tom

bonusbuilt1950

06-30-2013 @ 3:53 PM

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I've parted probably 6-8 F-series from F-1's to a F-4 and I've only had relays on the 51-52's with the hood mounted horns. And it was mounted near the starter relay ( V8 ) None of the single horns in front of the radiator had relays. I have also found single wire horns and dual wire horns on 48-50's. THese all had factory wiring and not all hacked up.
The 48-54 and 48-55 parts catalogs show a relay with a tan cover, but if you look at the wiring pic in the catalog, they don't show a relay in that pic until 1951.
On page 276 of the shop manual it states " Deluxe trucks are equipped with a pair of tuned horns controlled by means of a relay" Now the deluxe series of trucks did not appear until 1951. THe accessory trumpet dual horn kits had a relay. I am inclined by what I've seen over the years and the various parts catalogs and the shop manual, that trucks with single horns (48-50 ) did not have a relay. 51 and up did. I did not consult my 48-56 series parts catalogs as they were first printed in 1964 and were sort of a compilation and final issue that year. They are riddled with lots of mistakes and omissions and are a joke. I did Ford parts for 30+ years and have run into tons of mistakes in catalogs. Ford finds thier mistakes in catalogs from the people at the dealer level.
If you want to put a relay in, go ahead as it's added insurance, but if you're doing a 100 point resto, I say no.

Barry

50 F-1

49fordv8f4

06-30-2013 @ 1:45 PM

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Supereal, I'm learning working on these old trucks that nothing is set in stone. I think the assembly plants utilized what parts that were on hand left over from older models. For instance my truck, an early 1949 assembled at Kansas City, has the same cowl to fender seal stapled to the flange of the fender as the 42-47 trucks instead of the foam seal normally used. So maybe the Kansas City plant had some older horns left over also? Mark

49fordv8f4

06-30-2013 @ 1:35 PM

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Fred, sounds like that should work. Run the wires as supereal mentioned in his first post and you should be good to go.
Mark

supereal

06-30-2013 @ 11:53 AM

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One fact with Fords is that often there are often differences that are not "universal", but my references show that the horn relay was added to trucks in 1948, and the six volt version, 7RA-13853, was then installed thru the 1955 model year. If a truck doesn't have a relay, it is probably not a "deluxe" model, and some standard models apparently didn't get one after 1947. If not, I'd install a relay, as they are less than $20, and will preserve that high current system.

Fred Hanks

06-30-2013 @ 11:03 AM

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SOOOOO...In not knowing for sure what was there when new ,I am going to use a relay and a pair of Trumpet 6 volt horns, anyone see a problem there ????

Fred Hanks

06-30-2013 @ 11:03 AM

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SOOOOO...In not knowing for sure what was there when new ,I am going to use a relay and a pair of Trumpet 6 volt horns, anyone see a problem there ????

49fordv8f4

06-30-2013 @ 10:50 AM

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Please don't take this as argumentative as it is not my intention. I rechecked the wiring on my 49 F4 and there is no provision for a horn relay. There are TWO terminals on the back of the horn. One wire comes directly from the horn button and the other wire from the hot side of the start solenoid. The wiring harness is original and unmodified. The 47 COE that I had was wired the same way. As best as I can tell from the service manuals and the 1928-1948 Ford parts book that I have the TWO wire horns ( passenger up to 38 or 39 standards and trucks up to at least 49) did not use a relay. The horns with ONE wire all used a relay, beginning with 38 or 39 deluxe models. The 51 F2 parts truck that I have does have a ONE wire horn mounted on the underside of the hood but the relay is missing
The horn on my F4 is mounted in front of the radiator behind the grill. If your horn has the straight tapered projector about 8" long (not the seash*ll shape projector) and has terminals on the back for two wires the relay shouldn't be necessary.
Mark Poley

This message was edited by 49fordv8f4 on 6-30-13 @ 10:50 AM

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