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EFV-8 Club Forum / General Ford Discussion / 39 standard horns

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Discussion Topic: 39 standard horns

TomO

05-20-2022 @ 7:34 AM

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The Ford harness was different from the Deluxe harness. I am not familiar with the differences.

Check with the 1939 Adviser.

Tom

juergen

05-19-2022 @ 4:35 PM

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Once Ford went with the relay, it did away with the two wire motors. The one and two wire horn motors have the same form factor so they can interchange with the horn bodies. But you can use a two wire horn motor with a relay system; you just have to find a way/place to ground one of the wires. There is no factory place.

As the book explains, the relay was on the frame both for standard and deluxe. However the horn locations were different so I would suspect the wiring to the horns to be different

Ben38

05-19-2022 @ 1:15 PM

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My early, original relay (same as shown on page 4-32 on the 38/39 book only has three contacts. So the wires that need to be grounded aren't connected here? Are they grounded to the horn mounting bolts somehow?

My car is a standard, but I think the wiring harness I have is for the deluxe because the horn wire connections on the harness are too short to reach the centered location where the standard horns are mounted. Is there a difference between the standard and deluxe harnesses? Or were jumpers used between the harness and horns?

Thanks!

TomO

05-19-2022 @ 8:09 AM

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If you have the original type relay (it uses the same mounting bolt as the horn bracket) it has 4 terminals. The horn wires go into the 2 top spring loaded terminals. The next terminal down is the power source terminal, The heavy yellow and green wire is soldered there. The bottom terminal is for the horn button wire connection. The eyelet on the blue and yellow wire from the harness is soldered to this terminal and the bullet connector is connected to the black wire coming out of the bottom of the steering column.

If you have the aftermarket type horn relay ( https://www.dennis-carpenter.com/trucks/electrical/horn/7ra-13853-horn-relay ) the terminals should be marked with a 1 letter stamp.

Tom

juergen

05-19-2022 @ 6:01 AM

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The pre 38 horn motors had two wires, one went to the battery (always hot) and the other went to the horn button to ground. After 1937 Ford went with a relay and a one wire horn motor which was internally grounded to the frame. The relay supplied the switched hot wire. The three pole relay has an always hot, a momentary ground from the horn and switched hot to the horn(s) terminals. If you have a two pole horn, ground one wire and connect the other to the switched hot on the relay. Polarity is not an issue.

zeke3

05-18-2022 @ 3:25 PM

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Looking at the 1939 Standard wiring diagram on Mac Van Pelt's website, it shows the YG wires connected to the output side of the relay and the other wires complete the circuit to ground.

Bens38

05-18-2022 @ 12:22 PM

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I’m not that far along, but I’m wondering the same thing

ol 39

05-18-2022 @ 10:02 AM

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thanks tom, i have the book, and did get the mounting figured out, am still at a loss for the wiring to the relay. 2 wires coming out of each horn, how do they hook up to the relay? am i missing something?

TomO

05-18-2022 @ 8:17 AM

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I don't have a photo of the mounting, but there should be one in the 1938-1939 Book available from the Online Store or the Early Ford V-8 Foundation Museum.

The base of the bracket mounts to the frame and the upper part of the bracket uses 2 bolts to hold it to the inner fender apron.

Tom

ol 39

05-17-2022 @ 2:19 PM

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hi all, was wondering if someone could post pix of how the horns mount to the fender well, also of how they wire into relay? thanks in advance

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