Hi R.,
The way the horn circuit works is:
Power from the 1/2 fuse (not ign switched) via the purple wire goes to
both horns.
The other terminal on the horn(s) has a purple and black wire which goes
up the stator tube to the horn button. When the button is pressed the
purple and black is grounded through the stator tube itself to complete
the circuit.
If you momentarily ground one of the horn terminals which has the purple
and black wire on it the horns will blow. If you ground the other the
fuse will blow. Not as loud!!! There should always be 12 VDC at all 4
horn terminals (2 horns) when tested with a test light which is
grounded. Hope that helps.
Michael Salter
www.precisionsportscar.com
-----Original Message-----
From: owner-healeys@autox.team.net [mailto:owner-healeys@autox.team.net]
On Behalf Of R. Cobb
Sent: Wednesday, July 14, 2004 2:30 PM
To: healeys@autox.team.net
Subject: horn puzzle
The horns on my BJ8 are not sounding; the last time I tried to use them
they worked and then they just didn't.
Background info: I recently replaced the hydraulic brake light switch
which is located just below one of the horns, but I have no reason to
believe there is any correlation.
I have examined the schematic and done some tracing and have determined
the following:
When voltage is applied directly (jumpered from the starter solenoid),
the horns work;
When voltage is measured at the horn terminals (disconnected from the
horns) and the horn button is depressed, I read 11.6 VDC. I don't know
if that voltage seems a little low and might be causing a problem.
Connections at the horns seem good.
In the schematic, the horn button is shown making a connection to
ground, when depressed. In the process of tracing wires I am wondering,
is the ground connection at the horn switch? Or is there a wire coming
somewhere out of the steering column and connected to ground?
Any thoughts regarding this puzzle?
Thanks in advance.
R. Cobb
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