View previous topic :: View next topic |
Author |
Message |
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Tue Aug 15, 2017 10:53 am Post subject: M38 Horn Amps |
|
|
My M38 is converted to 12 volts and has an early military Sparton horn that sounds good. The previous owner had it alone on an un-fused circuit. I'm going to put a fuse in the circuit and need to determine what fuse size would best do the job. I've searched and researched and can't find anything about how many amps it draws, 12v or 24v.
I thought I'd ask for pointers before I have to cut in an ammeter and measure it. Does anybody know how many amps this horn or any similar horn might draw on either 12v or 24v for a fuse size?
Thanks! _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
|
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Tue Aug 15, 2017 11:21 am Post subject: |
|
|
Hey Brian. That's what I'm looking for --- the horn's data. No joy in my research. It's a "round-back" Sparton horn, the same as shown in the M38 TM by the looks of it. It's missing it's little data plate and has no other marking that I can see so there's no way to tell for sure. It looks original and un-molested to me. 15 amps seems a little heavy just for a horn and nothing else in the circuit? A relay set-up is a possibility, but am trying to keep things as simple as possible. And wouldn't a relay take 2 fuses? One on the primary side and one on the secondary side?
Everything else is correct for the M38 (horn rod through the steering gear box, switch screwed into the bottom of the steering gear box). _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Tue Aug 15, 2017 12:09 pm Post subject: |
|
|
I did come across some info that horns on early 6V jeeps drew 12-15 amps. If that's true, then a 12v jeep should draw about half that, or 6 to 7-1/2 amps. _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
|
Posted: Tue Aug 15, 2017 2:15 pm Post subject: |
|
|
Hi Ron,
Is your horn waterproof with Douglas or
Packard connectors? I don't think the 6 volt horns
were waterproof, hence no Douglas or
Packards.
I'm wondering if the M606 if that's the right model
had a 12 volt horn. Isn't that the later
12 volt vehicle? If so, is the horn waterproof?
Just seems improbable that a 24 volt horn would
work on 12 volts.
I believe the battery box breaker for the
horn on the M38 is 15 amps.
Bretto ran a heavy wire through a relay and fuse
to the horn, and ran a smaller gauge wire for the
button to the relay. That way only the main amp
draw is from the battery to the horn.
Take care, _________________ Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Tue Aug 15, 2017 4:03 pm Post subject: |
|
|
The horn has Douglas connectors. It's identical in appearance to the horn in the M38 TM and ORD9. I have no reason to think it's not a 24v horn, but it has no data plate or markings to prove it. I guess it could be anything.
I'll cut in an ammeter and measure it so I can size a fuse. _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Wed Aug 16, 2017 8:33 pm Post subject: |
|
|
I manually tested the horn <again> with multi-meter test leads direct to the battery (12V) -- no switch. Honked loud and clear. Then did the same with an ammeter in the circuit. Measured 4.64 amps --- but the horn wouldn't sound this time. Took the meter out and tested the horn again like the first time --- loud and clear. Now I'm looking for the manual to my Fluke 77 to see what the deal is with the ammeter. More to follow. _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
|
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Thu Aug 17, 2017 7:38 am Post subject: |
|
|
Series.
I'm pretty sure I had one of the meter leads in the wrong port on the meter and that's the issue. Still looking for the manual. I ought to know better by now to read the manual first. Especially since I don't use the ammeter side of it very often. The good news is I didn't smoke the meter. _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
|
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Thu Aug 17, 2017 5:55 pm Post subject: |
|
|
Thanks Wes. I've got a Series II. I was just about to take your suggestion when I found the original manual in the last place I looked.
Yes, I had a lead in the wrong port on the meter in the first try.
Hooked the meter up correctly and tried the test again (no meter first), horn sounds loud and clear. Put the meter in the circuit, horn sounds loud and clear and I read 2.15 amps.
I'm thinking an AGC 2.5 amp fuse will do the trick. _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
RonD2 Member
Joined: Oct 02, 2014 Posts: 1916 Location: South Carolina, Dorchester County
|
Posted: Thu Aug 17, 2017 9:12 pm Post subject: |
|
|
This measurement was without the M38 horn switch in the steering gear box and the 14 gauge wire in the circuit so I'll probably take another measurement once I get it all installed and hooked up. May have to bump the fuse size a tad. I'm glad to see it's not a lot of amps anyway. I was concerned about the unknown amp rating on the repro switch I bought. _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
|
|
Back to top |
|
|
Brinken Member
Joined: Oct 29, 2015 Posts: 154 Location: Karlskrona, Sweden, Europe
|
|
Back to top |
|
|
|