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The horn wiring changed on late model cars so that the stalk button puts =
out 12v to the horns, and the horns only have one wire each as they pick =
up an earth from their mountings.
As such the horn push should have purple (12v, fused always live) and =
purple/black (to the horn) wires. First thing to check is, does the =
interior light work? If not maybe the purple supply from the fusebox has =
failed, bottom fuse.
If so, with it lit press the horn button. Does it go out? If so then =
there is a bad connection back through the fusebox.
Next it depends on whether it is easier for you to check the wiring at =
the multi-plug by the column, or at the horns. In the former case look =
for the purple and purple black wires and check them (connector still =
plugged together) for 12v on the purple all the time, and on the =
purple/black when the button is pushed. If on the purple but not the =
purple/black the switch or wiring in the stalk is faulty. Sometimes the =
wires are moulded into the connector blocks so you can only test by =
parting the connectors just enough to expose the pins, but they are =
still making contact.
At the horns with the button pressed you should have 12v on the =
purple/black spades on the horns (wiring connected). If not and the =
test at the column multi-plug was good then the circuit back to there is =
faulty, most likely is a bad connection between the wiring connector and =
horn spade.
If you see 12v on the horn spade check a clean part of the horn body for =
12v as well. If you see that then the horn earthing is bad. If you saw =
12v on the purple/black spade but not on the body then the horn is bad =
internally.
It might seem unlikely that the fault is at the horns in both cases, but =
anything is possible.
BTW stuff the trumpets with rags to avoid getting a loud blast if you =
disturb the fault and one or other should suddenly start working :o)
PaulH
----- Original Message -----=20
We=E2=80=99re working on a 1980 B with a maddening assortment of =
electrical problems. Right now we=E2=80=99re trying to figure out why =
the horn push won=E2=80=99t work=E2=80=94and all the wiring diagrams =
(Bentley & Advance Autowire)=E2=80=94show the horn as having purple =
wiring=E2=80=94apparently meant for the horn push in the steering wheel =
button, not the push-in-the-wiper-stalk of this car. Any advice from =
the List?
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<BODY style=3D"WORD-WRAP: break-word" lang=3DEN-US link=3Dblue =
bgColor=3D#ffffff=20
vLink=3D#954f72>
<DIV>The horn wiring changed on late model cars so that the stalk button =
puts=20
out 12v to the horns, and the horns only have one wire each as they pick =
up an=20
earth from their mountings.</DIV>
<DIV> </DIV>
<DIV>As such the horn push should have purple (12v, fused always live) =
and=20
purple/black (to the horn) wires. First thing to check is, does =
the=20
interior light work? If not maybe the purple supply from the fusebox has =
failed,=20
bottom fuse.</DIV>
<DIV> </DIV>
<DIV>If so, with it lit press the horn button. Does it go =
out? If so=20
then there is a bad connection back through the fusebox.</DIV>
<DIV> </DIV>
<DIV>Next it depends on whether it is easier for you to check the wiring =
at the=20
multi-plug by the column, or at the horns. In the former case look =
for the=20
purple and purple black wires and check them (connector still plugged =
together)=20
for 12v on the purple all the time, and on the purple/black when the =
button is=20
pushed. If on the purple but not the purple/black the switch or =
wiring in=20
the stalk is faulty. Sometimes the wires are moulded into the =
connector=20
blocks so you can only test by parting the connectors just enough to =
expose the=20
pins, but they are still making contact.</DIV>
<DIV> </DIV>
<DIV>At the horns with the button pressed you should have 12v on the=20
purple/black spades on the horns (wiring connected). If not =
and the=20
test at the column multi-plug was good then the circuit back to there is =
faulty,=20
most likely is a bad connection between the wiring connector and horn=20
spade.</DIV>
<DIV> </DIV>
<DIV>If you see 12v on the horn spade check a clean part of the =
horn body=20
for 12v as well. If you see that then the horn earthing is bad. If =
you saw=20
12v on the purple/black spade but not on the body then the horn is bad=20
internally.</DIV>
<DIV> </DIV>
<DIV>It might seem unlikely that the fault is at the horns in both =
cases, but=20
anything is possible.</DIV>
<DIV> </DIV>
<DIV>BTW stuff the trumpets with rags to avoid getting a loud blast =
if you=20
disturb the fault and one or other should suddenly start working =
:o)</DIV>
<DIV> </DIV>
<DIV>PaulH</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV><BR></DIV>
<DIV class=3DWordSection1>
<P class=3DMsoNormal>We=E2=80=99re working on a 1980 B with a =
maddening assortment of=20
electrical problems. Right now we=E2=80=99re trying to figure =
out why the horn=20
push won=E2=80=99t work=E2=80=94and all the wiring diagrams (Bentley =
& Advance=20
Autowire)=E2=80=94show the horn as having purple =
wiring=E2=80=94apparently meant for the =20
horn push in the steering wheel button, not the =
push-in-the-wiper-stalk of=20
this car. Any advice from the =
List?</P></DIV></BLOCKQUOTE></BODY></HTML>
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