| Author |
Message |
bruce bowden
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 10:45 am: | |
Anyone know if the city horn wire is neative or positive wired? |
Geoff (Geoff)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 10:49 am: | |
Every horn button I have sever seen is negative (ground).
P.S. Unless you have positive ground!
--Geoff
'82 RTS AZ |
Stan
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 11:05 am: | |
Old GM buses were positive ground but many have been changed to negative ground. That determines the horn wiring. |
vern rainville
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 4:55 pm: | |
I think Bruce needs a little more guidence. I am not an electrical guy. If the coach batteries are negative to the chassis (grounded), then he has a negative ground for the horn. If positive is grounded (to the chassis), then positive is the ground for the horn. Did I say this correctly? Vern (in RI) |
Pete/RTS Daytona (Pete_rtsdaytona)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 7:30 pm: | |
Hi
Let's not make this any harder than we have too guys
negative ground / positive ground
doesn't matter
99.9% of horns button wires - have to be switched to ground for the horn to blow - simple as that
Pete RTS/Daytona |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 7:38 pm: | |
heh heh... You dah man, Pete!
(ground = ground) |
Stan
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 8:17 pm: | |
Simple answer Pete, but which polarity do you tie to the other side of the horn relay? It won't work without a source voltage. |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 9:30 pm: | |
Bruce -
What exactly, are you trying to do? Did you get the
answer you were seeking, yet? |
Pete/RTS Daytona (Pete_rtsdaytona)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 9:48 pm: | |
Hey Stan
you wrote-->"Simple answer Pete, but which polarity do you tie to the other side of the horn relay? It won't work without a source voltage."
Simple logic applies - one side of the relay coil would go to supply (whatever polarity the bus uses) and the other side of the relay coil goes to the horn switch - which (when push) goes to ground
then
one side of the horn relay normally open (n/o) point goes to supply (whatever polarity that is) and the other side of the n/o point goes to the horn itself - if the horn has 2 wire input the second wire goes to ground (whatever polarity that is)
is that clear enough yet - or do i need to draw a picture :-) ????
Pete RTS/Daytona |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 10:16 pm: | |
You still have that Etch-A-Sketch, Pete? |
motorcoach1
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 10:45 pm: | |
pete i'm glad you strighten that out .. now i get it when you reverse polaritys the sound goes out and if there backwards the sound gets sucked in so you can't hear it. |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 17, 2006 - 11:44 pm: | |
Same as the lights... gets real dark.
HAR! |
Marc Bourget
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 18, 2006 - 4:20 am: | |
Be nice guys! Remember the intial intention was to drain the . . er honk the horn!
Simple setup
Bruce, a horn is a simple resistance load. You just need to pass current through it to make noise. No different from a light bulb. There usually is only one terminal on an electric horn because they're "internally grounded" i.e. the body of the horn grounds to the chassis through the mounting bolts (whatever). You supply the normally-open horn button switch from whatever battery terminal is not grounded. The wire then goes from the switch to the terminal on the horn. When you push the button to "close" or make contact, the electricity flows through the horn, making the noise.
Not so simple set up.
With large current flows (horns usually take alot!) the horn is powered off a relay, which is, simply described, a remote switch operated by electricity. Same method of operation, but with a relay the horn button energizes the relay, which handles the larger current loads without the hassle of running big wires up to the Steering wheel and back. |
06 Bill
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 18, 2006 - 6:29 am: | |
Be careful with polarity. A reversed horn will suck not blow. |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 18, 2006 - 9:51 am: | |
Reversed polarity ---------------->
honk?
|
bruce bowden
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 18, 2006 - 9:58 am: | |
thanks guys that cleared that up! |
Stan
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 18, 2006 - 1:01 pm: | |
You are right Pete. I apologize for an uncalled for remark and a stupid answer. |