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

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Fred Hanks
06-29-2013 @ 7:53 AM
Member
Posts: 30
Joined: Aug 2010
          
I can't find a diagram to see where the horn relay goes,I have a new harness and can't figure the horn wiring out, my Ford book does not show it.... any help???

Fred Hanks
06-29-2013 @ 7:58 AM
Member
Posts: 30
Joined: Aug 2010
          
I have a '49 F1 v8 6 volt sys....

supereal
06-29-2013 @ 11:08 AM
Senior
Posts: 6819
Joined: Oct 2009
          
Fred: The horn relay should be on the drivers side of the firewall. Follow the wiring from the horn(s) and from the button wire that comes from the bottom of the steering column. The Ford colors for the horns are yellow/green from the battery source, such as the starter solenoid, blue/yellow from the horn button to the relay, andyellow/black from the relay to the horn(s). The horns are grounded thru their mounts. If you have a problem, be sure that the horn brackets are, in fact, a good ground. Often, the color coding of a replacment wire loom is incorrect, and be a problem if a diagram wasn't furnished with the wiring.

49fordv8f4
06-29-2013 @ 2:40 PM
Member
Posts: 60
Joined: May 2010
          
Fred, On my 1949 F4 the horn has two wires running to it, there is no relay on the firewall so it must be built into the horn. A #10 yellow wire with a green tracer runs from the hot side of the start solenoid to the horn and a #12 blue wire with a yellow tracer runs from the horn and comes out of the harness at the base of the steering gearbox were the horn button wire from the steering column plugs into it. The horns on the F2 and larger trucks that I have had were all wired this way. The horn looks the same as the earlier trucks. The F1 may have a separate relay on the firewall and will be wired as supereal posted. I hope this helps, Mark Poley

alanwoodieman
06-29-2013 @ 5:58 PM
Senior
Posts: 864
Joined: Oct 2009
          
are your horn(s) mounted on the hood?, my 51 is and the relay is mounted on the firewall pass side near the hood hinge

supereal
06-29-2013 @ 7:24 PM
Senior
Posts: 6819
Joined: Oct 2009
          
If it doesn't have a relay, someone removed it. The current draw of horns is very high, and will make short work of the horn button unless there is a relay. I've never seen a relay inside the horn. My truck manuals show a relay, usually the three pole version.

Fred Hanks
06-30-2013 @ 7:42 AM
Member
Posts: 30
Joined: Aug 2010
          
My '49 F-1 had no relay as someone had striped it b4 I found it...the horn should go behind the grille ?
I jus bought a relay on E-Bay that I will mount on the fire wall. Now I need to know what is the correct wiring, There is one wire from the horn button that comes out the bottom of the gear box and I have to go from there..
Thanx !!!!

49fordv8f4
06-30-2013 @ 10:50 AM
Member
Posts: 60
Joined: May 2010
          
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

Fred Hanks
06-30-2013 @ 11:03 AM
Member
Posts: 30
Joined: Aug 2010
          
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
Member
Posts: 30
Joined: Aug 2010
          
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 ????

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