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@delphi.com>
To: <triumphs@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?
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