Tim,
1. Do your horns work? Run wires from them to the battery and confirm this.
2. There is power to the horns, but will they work when the circuit is
completed? With the purple circuit connected to the horn run a ground to the
other horn terminal. If the horns work with (1) but not two, then you have a
corroded connection/bad wire. Open circuit checks of line voltage are
misleading.
3. From the horns the circuit is completed by a rather nasty string of
connections. The wire runs to a brass slip ring behind the steering wheel.
A spring loaded contact (looking something like a clear cut off Bic pen with
brass contacts and a spring inside) makes connection from the slip ring to
the steering wheel. But wait, there's more! The ground connection is
completed by two straps that go around the rubber universal joints in the
steering shaft. Now Tim, if you loose any of those connections, you don't
have horns. I'd check the circuit in this maneer (after verifying 1 & 2):
a. Run a wire from the slip ring to ground. If horn goes off the slip ring
is good. Install steering wheel and spring contact.
b. Run ground wire from steering shaft above the first rubber knuckle to
ground.If horn doesn't work then the spring contact is questionable.
c. If horn works in (b), then the problem is the wires that go around
the knuckles. Make two new wires and attach them to the knuckles, one side
of the wire to the bracket holding the top shaft, the other to the bottom
bracket.
Have fun - been there, done that!
Bruce Clough
'54 TR2
'62 TR4
'79&'81 TR7
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