Re: [T3] Horn fook-up

["Keith Park" <TopNotchResto@worldnet.att.net>]

Sorry, there is no ground wire from the axle to the frame in 65, if there
were the horn would never shut up!  sounds like the  author didnt really
understand it eather, thanks for the quote though, interesting seeing how
they tried to figure it out.

Keith


----------
> From: Per Lindgren <lindgre@online.no>
> To: jadney@vwtype3.org
> Cc: type3@vwtype3.org
> Subject: Re: [T3] Horn fook-up
> Date: Sunday, May 16, 1999 8:08 AM
> 
> To try to solve the problem of the Horn blues, I checked the Haynes, and
got
> the following:
> 
> <<Chapter 10/Electrical system
> 
> 
> 
> 23 Horn
> 
> 1  Horns have a habit of misbehaving and in most cases it is due
> to poor contactsÈÅnhe earth return wire.
> 2 The horn is mounted under the left front wing. It should not
> contact the bodywork at any point except by the mounting
> bracket.
> 3 If the horn fails to work first check the appropriate fuse and
> then, with the ignition switched on, check that voltage is
> reaching the horn by one of the two wires at the horn terminals.
> If not then check the wire back to terminal 15 on the fuse box.
> 4 Check next that the earth return wire from the horn to the
> steering wheel switch is maintaining continuity. This is usually
> the problem as en route the circuit has to reach the steering
> column, pass through the horn switch and contact the moving
> steering shaft to earth. The shaft makes earth contact at the
> steering gear and therefore needs a separate earth wire to bridge
> the flexible coupling which is also an insulation factor. To be
> sure that there is continuity the easiest way is to first remove
> the horn ring assembly and then make a circuit (with a test meter; or
> wires, battery and bulb) from the bottom of the wire where it
> joins the horn to one side of the horn switch. Then do the same
> test from the other side of the horn switch to earth.
> 5 To some people the time (and expense of trying to isolate
> the fault, regardless of the problems of fixing it when found are
> disproportionate. They therefore simply ignore the original
> circuitry and fit a separate switch conveniently nearby and feed
> a separate wire back from the horn to earth via the new switch
> 6 The horn itself may sometimes be faulty. Check it by feeding
> a battery supply direct to the two terminals outside the vehicle
> wiring system. The setting screw in the back is normally pre-set
> so any movement of this in an attempt to make the horn work
> should only be as a last resort.>>
> 
> To put it simple, the horn button gets its ground from the steering
shaft, and
> sends it through a wire to the horn. The steering shaft is grounded to
the
> steering box via a ground wire across the steering shaft cR«#
and a
ground
> wire from the axle beam to the frame. The Haynes also has a 6V wiring
diagram.
> Btw, its great with text scanning :-)
> 
> PerL
> 73 Variant L
> 
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