Horn Wiring

[garandshooter]

Good evening Gents,

I picked up a ‘42 GPW a few months back in great condition, but it’s missing a horn. The jeep is converted to 12V. I picked up a 12V horn and mount and confirmed with the owner that the wiring in the steering shaft from horn button to ground tab is in fact installed.

However, I didn’t get a chance to ask about the rest of the wiring, and I don’t seem to see any. From my understanding from the following wiring diagram, there’s a wire that goes from:

1. ground tab on column ——-> junction post
2. Junction post——-> horn
3. Ampmeter——> horn

I can’t seem to find these wires anywhere.

So question is,

1. Is there a source for these?

2. How hard are these to install post restoration (aka without having to take a bunch of stuff off)?

[Adam]

This has been a while for wiring, What do you want to source? correct colored and gauge wire pieces?


i did not climb under jeep to see if the wire is in a bigger harness,, but steer column brush to the terminal block is only a foot away,, get a piece of auto rated wire,, cover it with black cloth tape and install it. same with horn to junction block. maybe use an ohm meter to check the steer column circuit before you get too far into it.

wire from to horn to ammeter goes to a fuse first, check the fuses under the dash.

had to go out to the jeep and look, horn wire to ammeter or fuse, horn end wire breaks out of the harness right after the harness comes out of the firewall,, look close, maybe it is hidden inside or taped to the harness.

Adam

[garandshooter]

This has been a while for wiring, What do you want to source? correct colored and gauge wire pieces?


i did not climb under jeep to see if the wire is in a bigger harness,, but steer column brush to the terminal block is only a foot away,, get a piece of auto rated wire,, cover it with black cloth tape and install it. same with horn to junction block. maybe use an ohm meter to check the steer column circuit before you get too far into it.

wire from to horn to ammeter goes to a fuse first, check the fuses under the dash.

had to go out to the jeep and look, horn wire to ammeter or fuse, horn end wire breaks out of the harness right after the harness comes out of the firewall,, look close, maybe it is hidden inside or taped to the harness.

Adam

More so was curious to see if anyone manufactured the cables before I went about making up my own.

Out of curiosity, any idea what gauge the wire is?

[dpcd67]

Of course; Vintage Wiring.com, makes wiring for many MVs. Call them and get the correct color and size wiring.

[JAB]

This has been a while for wiring, What do you want to source? correct colored and gauge wire pieces?


i did not climb under jeep to see if the wire is in a bigger harness,, but steer column brush to the terminal block is only a foot away,, get a piece of auto rated wire,, cover it with black cloth tape and install it. same with horn to junction block. maybe use an ohm meter to check the steer column circuit before you get too far into it.

wire from to horn to ammeter goes to a fuse first, check the fuses under the dash.

had to go out to the jeep and look, horn wire to ammeter or fuse, horn end wire breaks out of the harness right after the harness comes out of the firewall,, look close, maybe it is hidden inside or taped to the harness.

Adam

More so was curious to see if anyone manufactured the cables before I went about making up my own.

Out of curiosity, any idea what gauge the wire is?

On the schematic; and the supplier I use, the two tracers mean it's 14 gauge and three mean 12 gauge. I use http://www.riwire.com/ for safe and period correct appearing wires and related terminals, etc. Click on "supplies" on the lower left.

[Boraxo]

It's your jeep . . . just an observation that I am always amused about jeep owners that want the factory correct parts to be 100 percent factory class accurate on a jeep that has been converted to 12 volts. Which way is it? Ron had the 12v horns on special last month for $65, I hope that's where you got yours.
And, remember that the horn button is just completing the ground circuit. The hot wire from the amp gauge to the horn is always hot and pushing the horn bbutton completes the ground circuit, so make sure those connections are good and clean.

[Adam]

Have you looked close to see if any of the wires are hidden, on the other hand, is it a ractory repo wiring harness or a home made one, cant see a repo assembly leaving out the horn wire. For sure on a 25 yo harness you cant really see the colors. this was a vintage wiring of maine reop. from the late 1990's

Adam

[Boraxo]

I have read that, sometimes, on 12v conversions, a reproduction wiring harness may be from another vehicle that is more correct for the 12v starter and possible alternator, such as a CJ 2 or 3 harness. If that is the case, the horn wiring may be different on the harness as the horn or horn button maybe a different location set up.
There is a seller on eBay, I think Tons Performance, or something like that that sells the vintage wiring in various colors and tracer threads that you can get in 10ft lengths and be a correct WWII wire on your 12 volt jeep.

[Bruce W]

CJ2’s, CJ2-A’s, CJ3A’s and early CJ3B’s are (or were) all six volt. CJ2’s and early CJ2-A’s used exactly the same horn setup as the MB/GPW’s. There is no reason for a twelve volt system to have any different wiring routing than a six volt system.
BW

[Boraxo]

Sorry, what I thought I had read was that the wiring harnesses from another model of vehicle might have the horn set up differently. It was not the voltage that made the difference, but the horn button and horn location. A friend of mine converted his M38A1 from 24v to 12v and the wiring harness recommended was from a CJ3B. The horn wiring was different.

[garandshooter]

Have you looked close to see if any of the wires are hidden, on the other hand, is it a ractory repo wiring harness or a home made one, cant see a repo assembly leaving out the horn wire. For sure on a 25 yo harness you cant really see the colors. this was a vintage wiring of maine reop. from the late 1990's

Adam

I looked and didn’t see any but will take a second look next time I’m around the jeep.

Would you happen to have a photo of the wire/circuit breaker that goes from the horn to the ampmeter?

[JAB]

viewtopic.php?t=226149

Scroll down a bit