Re-polarizing the dynamo will do nothing to the ammeter. The ammeter will
read backwards, if you change the car's electrical polarity. Reversing the
ammeter leads will fix that.
Bob Donahue (Still stuck in the '50s)
Email - bobmgtd@insightbb.com
52 MGTD - NEMGTR #11470
71 MGB - NAMGBR #7-3336
----- Original Message -----
From: "Gunnell, John" <gunnellj@krause.com>
To: <mg-t@autox.team.net>
Sent: Wednesday, October 15, 2003 9:43 PM
Subject: TF Problems of the Week
> Howdy Mates
>
> We're getting the old TF sorted out.
>
> Problem 1:
>
> Dynamo-related. One time it charges fine. The next time I drive it shows
discharge, then back again. Sometimes it will charge while driving, then
discharge when I get home and keeps discharging even if I rev it up. When I
do rev it up and it's discharging, the red light gets brighter as I rev it.
This in partucular doesn't seem right to me. Even if the dynamo was weak, if
yoiu rev it things should get better, not worse.
>
> Sometimes the light is on while I'm driving. I have not yet experienced
any battery weakness, but I carry the crank in case.
>
> You may recall that when I got the car the battery was in backwards. I
reversed it and re-polarized the dynamo but did nothing else. Some said to
reverse ammeter leads, but I thought re-polarizing took care of that. The
ground cable is clean and intact, though it is not the skinny MG type.
>
> To me it almost seems like the polarity is reversing back and forth; as if
it is actually charging both when it shows charge and when it shows
discharge.
>
> I don't have electrical gauges to check things out. I'd love to hear some
opinions on whether I really have a problem and simple fixes.
>
>
> John Gunnell
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