Donald, check to see if your generator is putting out positive voltage.
Maybe the field winding needs to be sparked a few more times.
A few tips:
I've found on my TD that the radiated electrical noise is so bad, I have to
use a "non-electronic" voltmeter to measure the battery voltage when the
motor is running. Any meter that has transistors or vacuum tubes gives bogus
readings. Perhaps this is due to the steel plug wires and non-resistor spark
plugs? The interference to a radio must be massive!
You probably already know that a generator shows a discharge at idle.
Ammeters are fine, but I think a voltmeter gives a better indication of the
charging situation. If you get a reading between 13 and 14 volts running
down the road with the headlights on, the charging system is probably OK.
(My stock Lucas voltage regulator was set at 16 volts, and the shop manual
seems to support this voltage. But this is way too high. I backed mine down
to 14 volts.)
Bob Donahue (Still Stuck in the '50s)
Email - bobmgtd@comcast.net
Cars: 52 MGTD - #17639
71 MGB - #GHN5UB254361
Member: NEMGTR #11470
NAMGBR # 7-3336
Hoosier MGB Club
Olde Octagons of Indiana
----- Original Message -----
From: <mgbob@juno.com>
To: <dontoy@comcast.net>
Cc: <mgs@autox.team.net>
Sent: Monday, August 27, 2012 9:59 AM
Subject: Re: [Mgs] Charging Problems
> You wrote that all was good before changing the polarity. Did you mean
> that
> the dynamo was charging as it should, then, but not now?
> If it worked properly then, and you sparked/polarised it, then it should
> b
> ok now.
> I suspect the control box. Clean its points and see if the problem is
> solved.
> There are many designs for multimeters. Set yous up for DC, and use a
> range
> that is greater than 15V, 0-20 scale would be better, if your meter has
> it.
> Bob
>
> ---------- Original Message ----------
> From: dontoy@comcast.net
> To: mgs@autox.team.net
> Subject: [Mgs] Charging Problems
> Date: Sun, 26 Aug 2012 23:40:35 +0000 (UTC)
>
> Dear Sages of the List, (Lawrie Alexander)
>
>
>
> Ever since I followed detailed instructions about going from a positive
> ground
> to a negative ground in my TF the ammeter has been showing a discharge.
> Yes,
> I
> did reverse the wires on the back of the ammeter. All was good prior to
> the
> switch. It seems to be holding it's own while just the engine is running.
> As
> soon as I turn on the headlights I show a fair discharge. I would love to
> use
> a multimeter to check the generator output prior to taking it out. I do
> have
> a
> multimeter but so many placesB (6) to plug in the probesB on the
> multimeter.
> and so many settings on the dial. I get somewhat cornfused. Any help out
> there. Any troubleshooting advice would be very much appreciated.B
>
>
> Donald J. Toy
> "all great men are dead...and I'm not feeling well"
> _______________________________________________
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