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Horn Wire #1317035 Tue Jul 09 2019 12:08 AM
Joined: Feb 2011
Posts: 873
R
rickmg Offline OP
Shop Shark
What is involved to replace the horn wire from the steering wheel to outside the bottom of the steering mast on a 1939 Chevy truck? Mine is bare at the bottom of the steering mast and shorting out.

Rick

Re: Horn Wire [Re: rickmg] #1317041 Tue Jul 09 2019 12:41 AM
Joined: Mar 2010
Posts: 8,425
5
52Carl Offline
Master Gabster
I had that problem with my '50. I slid a short section of heat shrink tubing over the end of the horn wire up through the hole in the mast. I then applied some heat to the portion of the tubing which was outside of the mast to hold it in place. It worked like a champ.
I am guessing that the only part of the wire which was missing insulation was close to the hole in the mast.
It was worth a shot to try the heat shrink tubing fix. If that had not worked, I would have had to order a pricey new mast bearing which comes with a new wire, and pull the steering wheel and the old bearing. I do not know if the '39 has the same design for the mast bearing/horn wire.
Carl

Re: Horn Wire [Re: rickmg] #1317054 Tue Jul 09 2019 02:09 AM
Joined: Feb 2011
Posts: 873
R
rickmg Offline OP
Shop Shark
You are correct Carl. The wire is bare where it comes out of the mast. I'll give your heat shrink tube fix a whirl the next couple of days.

Rick

Re: Horn Wire [Re: rickmg] #1317103 Tue Jul 09 2019 05:00 PM
Joined: Jun 2006
Posts: 740
T
tomctomc Offline
Shop Shark
whenever you need to replace an old wire that is concealed or routed through an inaccessible space, a useful technique is to connect the new piece to the old (by twisting, tying, soldering, etc) and use the old wire to pull the new one through...

Re: Horn Wire [Re: rickmg] #1317153 Wed Jul 10 2019 12:43 AM
Joined: Mar 2010
Posts: 8,425
5
52Carl Offline
Master Gabster
Rick,
Does the bare wire against the hole in the mast make the horn honk? It should, I think. You definitely need to fix the bare wire, but if your horn isn't currently working, you may have another issue besides the bare wire.
Carl

Re: Horn Wire [Re: rickmg] #1317172 Wed Jul 10 2019 02:20 AM
Joined: Feb 2011
Posts: 873
R
rickmg Offline OP
Shop Shark
The wire is bare at the hole in the mast, completing the circuit and causing the horn to blow. Does it both the city and country horns. Another thought I had was to drill a hole a couple of inches above the existing hole. Capture the electrical line below, pull it through the new hole, repair it, and draw it back through the original hole. Going to try the shrink tube method first. Hopefully tomorrow. Went fishing with a friend today instead of working on the horn.

Rick

Re: Horn Wire [Re: rickmg] #1317551 Sat Jul 13 2019 01:57 AM
Joined: Feb 2011
Posts: 873
R
rickmg Offline OP
Shop Shark
Update on the horn wire. Looks like it is shortening out not too far under the steering wheel. No short cut for that.

Rick

Last edited by Rusty Rod; Sat Jul 13 2019 02:49 AM. Reason: non electrical info
Re: Horn Wire [Re: rickmg] #1318470 Sat Jul 20 2019 12:36 AM
Joined: Feb 2011
Posts: 873
R
rickmg Offline OP
Shop Shark
Any advise on removing the steering wheel from my 39? Nut came off easily. Squirted some PB Blast and I'll let that set until tomorrow. Got up to 98 degrees today with horrendous humidity. Needless to say didn't do anything outside today except livestock chores.

Rick

Re: Horn Wire [Re: rickmg] #1318475 Sat Jul 20 2019 02:04 AM
Joined: Sep 2015
Posts: 32
W
Wheelie Offline
Wrench Fetcher
You'll need a steering wheel puller. There are two 5/16"-18 threaded holes in the steering wheel to attach the puller and then you tighten the drive bolt against the shaft to pull the wheel. I had to make one for my '46 because the standard puller wouldn't work due to the narrow spacing of the holes on the steering wheel. If yours is anything like mine, you'll need the mast off the steering column to get the bearing out.

Re: Horn Wire [Re: rickmg] #1318606 Sun Jul 21 2019 03:26 AM
Joined: Jun 2011
Posts: 2,846
E
EdPruss Offline
Shop Shark
Leave the nut on to protect you body parts when the wheel comes off. I grasp the wheel tightly, straighten legs to be able to pull hard on the wheel while rocking it back and forth or side to side. A rubber hammer used on the bottom of the wheel also works. Use or make a puller if above does not work.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
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