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
> >
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