Bob,
you are partially right, I dropped a bollock on the P type , having
looked at Blower again (which dosn't show battery polarity) and a copy of
the Lucas W320 wiring diagram (which does), they were negative earth!
However TAs and TB's (both pre-war) were positive earth. I have wired my P
type positive earth as I followed my TA wiring diagram using a CJR3 (same as
TA) that I had rather than the correct CJR2 for the PA. When I fitted the
new loom I could not read the diagram in my copy of Blower, so used the
Lucas TA diagram (the only one I had at the time) as a basis. ...
Just goes to show that you soon forget what you did a few years ago, and
sitting at a keyboard it is very easy to make a mistake, the good thing is
you soon get corrected!!
Incidently, a couple of months ago I changed the cutout (CJR2/3) on a
friends NA, unfortunately the guy who supplied the rebuilt cutout got into a
mess trying to subsitute them!! He took a wire off the old and transferred
it to the new, but after moving a few wires there was not enough slack in
the loom, he then started extending the wires!! I spent most of the
afternoon sorting it out for him, working from an old enlarged copy of the
Blowers N type diagram suitably adapted by the previous owner who restored
the car. The moral of it was, if you have to do this spend a lot of time
drawing your own diagrams of what wires are on every terminal screw of the
cutout, and the way the cables lay! Then remove the old cutout and wire in
the new one following the drawings you have made. That way it is a lot
easier!
Happy days, Brian Rainbow... PA0777 and TA2551
----- Original Message -----
From: J.E.A. Rich <mmmbob@adelphia.net>
To: Brian J Rainbow <brian@brianjrainbow.free-online.co.uk>; Mike Hughes
<hughes.c.m@worldnet.att.net>
Cc: <mg-mmm@autox.team.net>
Sent: Friday, November 01, 2002 12:28 AM
Subject: Re: MMMs are Negative Earth
> Brian,
>
> I regret I have to disagree. I know I'm getting old and my memory is
> disappearing, but I never saw a positive earth M.G. before WWII and I
worked
> on several. Do you have some wiring diagrams to prove the rest of us are
> wrong?
>
> Cheers, "Bob".
>
>
> > From: "Brian J Rainbow" <brian@brianjrainbow.free-online.co.uk>
> > Reply-To: "Brian J Rainbow" <brian@brianjrainbow.free-online.co.uk>
> > Date: Thu, 31 Oct 2002 19:49:10 -0000
> > To: "Mike Hughes" <hughes.c.m@worldnet.att.net>
> > Cc: <mg-mmm@autox.team.net>
> > Subject: Re: MMMs are Negative Earth
> >
> > Mike,
> > the P Types, N Types, TA/B/C/D/F were all positive earth, as were
> > the MGA's...Early MGB's were also positive earth until 1968(?) when they
> > switched from a dynamo to an alternator and converted to negative
earth...
> > Don't believe these guys when they say all MMM are negative earth....
Mind
> > you quite a lot of MMM cars have been converted to negative earth so
that
> > they can run an alternator driven off the back axle. and just have a
dummy
> > dymamo with thicker shaft to take the drive from crankshaft to
camshaft.....
> > This will no doubt upset the purists, but have a nose under the rear of
a
> > few well presented MMM cars next time you are at a large gathering!! It
sure
> > makes them a lot more usable, especially at night with decent halogen
> > headlamp bulbs and uprated rear lamp bulbs, better to be safe than
sorry...
> >
> > Best wishes, Brian Rainbow PA0777 and TA2551
> > ----- Original Message -----
> > From: Mike Hughes <hughes.c.m@worldnet.att.net>
> > To: <mg-mmm@autox.team.net>
> > Sent: Thursday, October 31, 2002 6:43 PM
> > Subject: Re: MMMs are Negative Earth
> >
> >
> >> Thanks for all the responses. My L-1 wiring diagram is almost
unreadable
> > as
> >> it is a copy of a copy of a copy.... Does this mean that my TA is
> > Negative
> >> earth also?
> >>
> >> I will have to come up with a new motto. I keep on telling all my
> > friends
> >> who have newer M.G.s with alternators or who have changed their older
cars
> >> over to negative ground that "Positive Earth is a state of mind!"
> >>
> >> - Mike Hughes -t?t-
> >>
> >> /// unsubscribe/change address requests to majordomo@autox.team.net
or
> > try
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