L3940hst cab horn not working

J

Jmann643

New member

Equipment
L3940 hstc, gx720 backhoe, 74" blizzard snow blower
May 13, 2017
9
0
0
Nl
Hi,

The horn isn't working in my L3940 cab. I checked the horn button and it is functioning properly. Tried the horn direct off the battery, good. Could it just be a wire or is there some other electrical component that could be gone? If it is the wire would I just run another?

It is a bit of a safety issue not having the horn. Any help would be appreciated.


Thanks.
 
2

200mph

Well-known member

Equipment
L4740-3 Cab, FEL, Fnt Snow Blower L2185, LP Finish Mower, LP Rotary Mower
Mar 3, 2017
1,228
59
48
PA
Did you check the fuse (25amp)?

There is also a diode or at least that is what they are calling it in the wiring diagram.

Did you have 12 volts at switch or only verify switch continuity?

Here's a diagram you might find helpful.

Post back what you find.
 

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Dave_eng

Dave_eng

Well-known member
Lifetime Member

Equipment
M7040, Nuffield 465
Oct 6, 2012
5,128
933
113
Williamstown Ontario Canada
200 mph has made a very good call.

Everyone is adding diodes these days because of electronic systems on tractors.

One on the horn circuit is a new one for me but clearly it is there in the wiring diagram.

This is the parts info from Messicks

Diodes usually blow because someone has hooked up booster cables or battery chargers wrong. Could this have happened to your tractor?

Dave
 
J

Jmann643

New member

Equipment
L3940 hstc, gx720 backhoe, 74" blizzard snow blower
May 13, 2017
9
0
0
Nl
Hey guys,

Thanks for the help. I will look into the diode and let you know.
 
J

Jmann643

New member

Equipment
L3940 hstc, gx720 backhoe, 74" blizzard snow blower
May 13, 2017
9
0
0
Nl
Hey Folks,

It***8217;s been a while but finally got around to getting the replacement diode. I took the dash covering off but can***8217;t seen to locate the diode. Any advice on where this would be mounted?

Thanks again.

Thanks again.
 
J

Jmann643

New member

Equipment
L3940 hstc, gx720 backhoe, 74" blizzard snow blower
May 13, 2017
9
0
0
Nl
Found the diode, replaced with new one...still doesn’t work.
 
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