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Horn wire gauge size #1228944 Mon Aug 07 2017 10:55 PM
Joined: Feb 2008
Posts: 997
4
46Sparky Offline OP
Shop Shark
Working on wiring the '46 Chevy 1/2 ton and need to know what gauge wire size is needed for the horn ground wire. Sparky's was missing all but a small remnant soldered to the mast bearing. It appeared to be 16 gauge. So, that's what I used. But, now many months afterward and deeper in to this, I find the wiring harness has much heavier gauge wire (10 gauge?) for the connection at the lower end of the steering column and at the horn terminal wire end.

The shop manual wiring diagram doesn't show gauges sizes, unfortunately. Furthermore, the harness being used does not match color and stripe codes described. It was made some 25 years ago by an unknown vendor and efforts to determine the source have been without joy.

What is the correct horn ground wire gauge?

Thanks

Re: Horn wire gauge size [Re: 46Sparky] #1229004 Tue Aug 08 2017 03:12 AM
Joined: Oct 2016
Posts: 685
N
Norcal Dave Offline
Shop Shark
My new horn wire that came with a new mast bearing was 16 to 18 gauge... did some year trucks have a horn relay and others did not?

The wire from the horn button going to a relay would be a small gauge wire, right? Then the horn side of the relay would have heavier wire, right?


Dave

Clutch head screws have stolen too many hours from my life....

1950 Chevy 3600 (resto-something) - the work resumes...
https://goo.gl/photos/8t5mLuj4JZebvGq49

1963 GMC Widebed Custom

1951(?) GMC flatbed that is now a flower garden:
https://goo.gl/photos/H79pvKhHLxjNiR149

1968 Chevy II Nova- not running, waiting for me to finish the '50 3600
https://goo.gl/photos/Dh7q4pt3WSkKjjFr9
Re: Horn wire gauge size [Re: 46Sparky] #1229009 Tue Aug 08 2017 03:58 AM
Joined: Jan 2013
Posts: 1,426
J
Jim Sears Offline
Shop Shark
I'm not sure '46 ever had relays. The '48 2 ton had a single horn and a 10 Ga mast wire.

Re: Horn wire gauge size [Re: 46Sparky] #1229039 Tue Aug 08 2017 01:09 PM
Joined: Feb 2008
Posts: 997
4
46Sparky Offline OP
Shop Shark
I should have indicated that I am using Town and Country horns. There is a relay mounted on the bracket with those horns. The original single horn does not use a relay, as far as I know. Both types came in the parts pile from the previous owner.

Dave, the wire size noted in your reply is what it appears this one would have when done. I am uncertain I've got this right though and that's why I am asking. The mast bearing was replaced with a NOS that didn't have a wire attached. I soldered a 16 gauge wire to it using the old mast bearing as an example.

Thanks

Re: Horn wire gauge size [Re: 46Sparky] #1229047 Tue Aug 08 2017 01:53 PM
Joined: Oct 2016
Posts: 685
N
Norcal Dave Offline
Shop Shark
I had no idea the original horn didn't have a relay... I just assumed that it would need one. I've only just begun to re-wire my truck, but I'm using a 12V universal kit so the horn wires will most likely be small gauge for a relay, I imagine... the piece of wire on my old horn looked like this: Horn wire

Hope that helps a little... I have since thrown the wire away, so I can't measure it for you- sorry.

Last edited by Norcal Dave; Tue Aug 08 2017 05:43 PM.

Dave

Clutch head screws have stolen too many hours from my life....

1950 Chevy 3600 (resto-something) - the work resumes...
https://goo.gl/photos/8t5mLuj4JZebvGq49

1963 GMC Widebed Custom

1951(?) GMC flatbed that is now a flower garden:
https://goo.gl/photos/H79pvKhHLxjNiR149

1968 Chevy II Nova- not running, waiting for me to finish the '50 3600
https://goo.gl/photos/Dh7q4pt3WSkKjjFr9
Re: Horn wire gauge size [Re: 46Sparky] #1229054 Tue Aug 08 2017 02:14 PM
Joined: Sep 2001
Posts: 29,260
tclederman Online
Boltergeist
1953 was the first year that a standard horn had a relay (on the firewall).

The GM accessory dual "seashell" Matched Horns came with a relay.
http://chevy.oldcarmanualproject.com/accessories/1951am/51aim40.htm


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Horn wire gauge size [Re: 46Sparky] #1229088 Tue Aug 08 2017 05:01 PM
Joined: Feb 2008
Posts: 997
4
46Sparky Offline OP
Shop Shark
I think I stumbled on to the answer. I found a wiring diagram for a 1950 Buick that shows dual horns. The mast bearing wire to the horn relay shows a 16 gauge wire was used. It might be a stretch to assume this but, I think it would likely also be acceptable for this project.

Alternative ideas, info are welcome.

Re: Horn wire gauge size [Re: 46Sparky] #1229100 Tue Aug 08 2017 06:14 PM
Joined: Sep 2001
Posts: 29,260
tclederman Online
Boltergeist
12 gauge is shown for the wire from the horn relay to the horn on both cars and trucks in 1954 (6v).


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.

Moderated by  Rusty Rod 

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