Thought I had posted it - it's a 78 B roadster
At 06:23 PM 11/13/99 -0800, Bud Krueger wrote:
>I should learn to put my brain in gear before engage my mouth, er ---
keyboard.
>It's the washer switch line that gets grounded, the horns are directly
powered.
>I'll get a relay put into that circuit next week!
>
>Tab, it might help to know what year your car is. There are quite a few
>variations in the wiring schemes. If you have a 'later N. American'
model, which
>would seem to cover 1975 on, the wiring harness contains a WG (white w/green
>tracer) line that is connected to the first position of the ignition
switch. This
>is for the radio power, not for the 'always hot' line to hold the
pre-sets. The
>white/green line allows you have the radio switched on without having to
power the
>ignition circuit. The line for the radio pre-sets wants to be connected
to one of
>the purple wires. In a 77, it's very easy to tap off of the purple wire
that's
>feeding the interior lamp. Don't use the purple/white, that's going to
the door
>switches and gets grounded. It may seem like a long way, but the handiest
ground
>point for the radio is to fish the ground wire up to the area of the wiper
motor.
>You'll find a number of black wires going to chassis ground right by (or
on) the
>motor. Easy to get to with the glovebox removed.
>
>It's still possible that your purple circuit is 'grotty' as Paul put it. An
>indication of this might be seen by sounding the horn while the interior
light is
>on. If the light dims appreciably, you've got a grotty circuit and need
to clean
>it up.
>
>Sometimes it's easier to work around an electrical problem than to
troubleshoot
>the existing configuration.
>
>Hope this helps,
>
>Bud Krueger
>52TD
>77MGB
>
>Tab Julius wrote:
>
>> Well, stealing the ground seems to be the #1 vote so far...
>>
>> With that consensus, how should I consider fixing it?
>>
>> At 02:58 PM 11/13/99 -0800, Bud Krueger wrote:
>> >Excuse me for not being specific re: colors, etc., I don't have a wiring
>> diagram
>> >handy. However --- I do recall that the horn is actuated by grounding the
>> wire
>> >coming to the horn switch. This means that the wire has 12v on it when
not
>> >actuated. I'd be willing to venture a guess that the radio is getting its
>> power
>> >from this wire. Sounding the horn makes the line go to ground, removes
power
>> >from the radio, goodbye presets. At least that's my $.02 worth.
>> >
>> >BTW, at least in my 77B, there is a separate wire for powering the
radio when
>> >the key is turned to the first position.
>> >
>> >Bud Krueger
>> >52TD
>> >77MGB
>> >
>> >Paul Hunt wrote:
>> >
>> >> Could be two seperate problems, especially if your radio is connected to
>> the
>> >> purple circuit (hot, fused) to maintain the station memory. The
horns are
>> >> also connected to this circuit and draw quite a significant current,
so if
>> >> the purple fuse is grotty sounding the horn could cause a significant
>> >> voltdrop on the circuit.
>> >>
>> >> PaulH.
>> >> http://freespace.virgin.net/paul.hunt1/
>> >> (or if that URL doesn't work try )
>> >> (http://194.168.54.52/paul.hunt1)
>> >>
>> >> -----Original Message-----
>> >> From: Tab Julius <tab@penworks.com>
>> >> To: mgs@autox.team.net <mgs@autox.team.net>
>> >> Date: 12 November 1999 17:02
>> >> Subject: Ghost in the Machine (part deux)
>> >>
>> >> >
>> >> >The other week I queried about how my radio mysteriously played on
after
>> >> >the key was removed (and engine cut off, etc)., but the second I
>> touched my
>> >> >key to the ignition lock it disconnected (coincidence?).
>> >> >
>> >> >This morning, while having the radio tuned to FM 93.3 (playing a very
>> >> >British Pink Floyd, btw), I realized that a quick honk of the horn
cleared
>> >> >power to the radio and I was suddenly listening to static on the
default
>> >> >89.7. I reset the station, did a quick re-test, and darned if honking
>> the
>> >> >horn doesn't pull the permanent memory power to the radio.
>> >> >
>> >> >I have a new radio to put in (not because of this, but because the
current
>> >> >one is a cheapo), but before I do I'd like to appease the Ghost of
Lucas
>> >> >and find what's rigged up wrong. Any ideas?
>> >> >
>> >> >- Tab
>> >> >
>> >
>> >
>> >
>> >
>> >
>
>
>
>
>
|