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#1 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Need help with strange horn problem
Problem is I cant get it to work, it is a 72 c10 with a grant wheel. When I press on the horn button the horn relay clicks like it should. If I use a circuit tester on the horn wire it lights up when I press the horn button. I have tried 4 other horns plus a brand new one and none work. Cleaned all grounds, even tried hooking each horn directly to the battery and none worked. Also replaced the horn relay with a new one, same results.
If anyone has any suggestions on what to do next I would appreciate it. Thanks Scott
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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#2 | |||
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: Need help with strange horn problem
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If not for that last test, I would suggest your core support (which the horns mount to) is not properly grounded.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 10-21-2012 at 08:47 PM. |
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#3 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Horn hooked straight to the battery.
Wire hook up to positive of battery and ground the horn itself and it doesn't work. 5 of them that's unherd of. ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#4 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Re: Need help with strange horn problem
I find it hard not one of the horns will work, driving me nuts.
I think I have a couple more horns around here, will try a couple more. thanks for everyones input.
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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#5 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Need help with strange horn problem
it is hard to believe that 5 horns would be bad.....but that is what is sounds like, are you getting a full 12 volts out of your battery and at the horn wire?...
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#6 |
Registered User
Join Date: Sep 2011
Location: San Jose, California
Posts: 784
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Re: Need help with strange horn problem
Welcome to Grant-aholics Anonymous, the place people come for sympathy and support regarding Grant horn problems. We usually start the meeting like this:
"Hi, my name is Bob, and my horn doesn't work." You're one of the lucky ones; Your wheel button works. You are one in a million! |
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#7 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,515
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Re: Need help with strange horn problem
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Make sure where you are grounding the horn is shiny metal. I usually take a file and make a shiny spot on the corner of the bracket. You might try rapping on the horn with a small hammer handle or screwdriver handle in case the points are stuck a little bit. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#8 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: Need help with strange horn problem
Spraying WD-40 into a non-working horn sometimes gets it to work..... or so I've been told.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Need help with strange horn problem
the stud that the horn is mounted is your main grounding point of the horn
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#10 |
Senior Member
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Location: Hampstead, NC
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Re: Need help with strange horn problem
Ok, I must be doing something wrong, just dont know what.
I took 6 horns and wired them directly to another good battery. I went directly from ground to mounting bracket, and hot to wire terminal. I used a test light in the positive connection and each time it would light up so I know I am getting a completed circuit. NONE of the horns worked. WHAT AM I MISSING???
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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#11 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Need help with strange horn problem
take horn off mounting bracket wrap ground wire around the stud that the horn mounts to go to neg battery terminal// postive terminal hook to horn spade unit
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#12 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: Need help with strange horn problem
Maybe I'm reading this wrong -- if your test light is in series with the positive side of your circuit, then yes, it will light up.... but probably won't flow enough current to operate the horn. The positive lead needs to go directly to the terminal on the horn. Then check the connection with the test light separately (that is, in parallel).
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#13 | |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: Need help with strange horn problem
Quote:
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Fuzzy |
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#14 |
Old member
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Location: Liberty, & Garden City S.C. , U.S.
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I stated this in post #3. Hook horn straight to battery and ground. Didn't say anything about a test light though. That would do it though not enough amps passing the bulb to sound the horns.
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#15 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: Need help with strange horn problem
Scott, think of current flowing through a wire as being similar to water flowing through a hose. Whatever job you want done (like blowing a horn) will require a certain volume of current flowing through the circuit.
In order for the horn to work, it takes quite a bit of current. If the horn ran on water (instead of electricity), let's say it takes the volume that a garden hose can supply. If you insert a test light into the path of the flow, it's like inserting a straw inline with the garden hose. The flow becomes so restricted that the horn cannot operate. Hope this illustration helps and doesn't just confuse things more!
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#16 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Re: Need help with strange horn problem
thanks guys....will retest without test light
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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