The purple/white connects the door switches to the lamp and should therefore
show 0v with the doors open and 12v with them closed. The purple wire comes
from the fuse and should show 12v all the time. The black wire is supposed
to be the ground for the switch on the light and should be at 0v all the
time. If the purple/white shows 12v all the time then it is probably linked
to the purple in some way which is why the fuse is blowing when the door
opens. This 'link' could be a short inside the light unit. Does it still
blow the fuse with the bulb removed?
There is a schematic of the interior lights on my web site, select
'Spanners', 'Electrics', 'Schematics' and 'Lighting' then scroll down to
'Interior Lights and 'lights on' warning:' and click on the thumbnail.
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: John Steczkowski <stecz@Crossroads.com>
To: MG Mailing List (E-mail) <mgs@autox.team.net>
Sent: Saturday, March 04, 2000 3:41 AM
Subject: Interior light wiring
> (this is on a '75 MGB)
>
> I had a problem the other day, that I realized I had because the horn
> wouldn't work... It turns out that the fuse was blowing everytime I opened
> the door (that's hard to diagnose when you aren't expecting opening the
door
> to blow the fuse). I removed the interior light and the fuse has stopped
> blowing. My problem is that I can't diagnose the problem.
>
> I can't tell what the white and purple wire is hooked to, it's not ground
> and it doesn't ground when the switch is out. (that would indicate that
it's
> the ground that goes to the door plunger.
>
> both the black and purple wire have 12 volts all of the time.
>
> Any hints? Any diagnosis tips? I'd kind of like to have a direction
before
> I totally remove the console and start dissassembling the wiring harness.
>
> ----
> John Steczkowski
> Director, Server I/O
> Crossroads Systems, Inc.
> 512-794-2742
>
>
>
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