Check brushes for good contact. Yes your guess for bad diode(s) can be
another cause, but I would say these do not seem to cause a flickering
ignition light.
So check for bad contacts and almost broken wires - often near contacts or
connectors.
Cheers,
Hans
'71 BGT
----- Original Message -----
From: "Steve Gorr" <sgorr2@comcast.net>
To: "MG list" <mgs@autox.team.net>
Sent: Sunday, July 17, 2005 5:51 AM
Subject: Flickering Ignition light
> So the 78 B and I head up to the BRIC race weekend at Road America and on
> the
> way the ignition light goes on. The roadside check shows I'm getting 14.3v
> at
> the battery. I cleaned the contacts on the alternator but the light
> remains.
> Doesn't seem to be losing any charge after several days driving. Starts
> out in
> the morning with just a faint, pulsating flicker. Pulsing snot affected by
> load but the higher the revs the brighter it gets. Finally, when fully
> warmed/hot the light is on constantly but a bit dimmer than at "bulb
> check"
> time. Perhaps one of the 3 diodes is shot?
>
> What is the list's collective wisdom? Rebuild the alternator, replace it
> with
> another Lucas unit, or get one of those Bosch units I've heard of? If the
> Bosch is supposed to be better, which one do I go looking for?
>
> Steve Gorr
> 78 MGB, Carmine
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