[TR] TR4 Horns not working. I need a suggestion

[Greg Gelhar]

It is not that both sides of your horn are going plus 12 volts, you are just 
reading through the horns windings. You know the problem. Your not getting a 
switched ground from the horn button. The horn ground depends on a jumper 
around the rubber flex couplings on the steering shaft. Check to make sure 
the little wire bridging those couplings are intact.


Greg G.
Osseo, MN


----- Original Message ----- 
From: "Daehler, William F" <william.f.daehler at delphi.com>
To: <triumphs at autox.team.net>
Sent: Wednesday, July 11, 2012 2:29 PM
Subject: [TR] TR4 Horns not working. I need a suggestion


> My horns have stopped working.   They had working fine when I put in the 
> new
> wiring harness five years ago.
>
> I started troubleshooting last night, and found that I do have 12 V going 
> to
> the one terminal to each of the horns. Unfortunately I have 12 V going to 
> the
> other terminals too!
>
> There must be a short somewhere, but my battery doesn't go dead all the 
> time.
> That's fine.
>
> I did a little more experimenting.  I disconnected one of the leads from 
> the
> horn (the purple and black wire that is supposed to be grounded).  Then I 
> took
> a jumper wire with alligator clips, and ran it from the free tab on the 
> horn
> to a  true ground.  The horn worked fine! Toot, toot !  I repeated this on 
> the
> other horn, it worked too. Toot, toot.
>
> Then I took off the horn switch on the steering wheel, measured the 
> incoming
> voltage, checked that the metal steering column was Zero volts, and 
> checked
> the operation of the switch, nothing wrong there.
>
> It seems like the ground path is going hot, but the battery isn't going 
> flat.
> Puzzling.
>
> Any suggestions?