[Healeys] Electrics

[john harper]

Mike

Sometimes a new dynamo needs remagnetizing. It relies on residual
magnetism to start giving out electrical power, All it needs is to
disconnect the field connection ( F  Smaller connection) and with a jumper,
lead connect 12 v from the battery to the F terminal. Just about 5 seconds
is sufficient. Reconnect the original connection and see if the red light
has gone out

On Sun, 27 Nov 2022 at 01:47, Mike Sinclair <phoenix722 at comcast.net> wrote:

> Need some enlightenment.  Awhile back, the car (BJ8) was running fine, but
> I noticed the little red light that says the battery isn't being charged
> was on.  (I do keep the battery on a Battery Minder" when not in use.)
> Chased the system down, and discovered the generator was putting out zero
> volts.  Adjusted the fan belt, no change.  On closer inspection, the rotor
> was damaged (a bar was actually missing).  Had the unit rebuilt, and it is
> working fine, but still had the little red light wouldn't go out.  Checked
> all the connections, continuity, voltage regulator, couldn't find any thing
> out of the ordinary.  Finally, upon closer inspection of the regulator with
> a mirror, found the contacts on one of the coils were welded together, and
> the leaf spring holding that contact was completely severed.  According to
> the manual, this is the "cutoff coil".  New regulator solved the problem.
>
> Now the questions.
>
> 1. What could cause the rotor to be damaged?
>
> 2. What could cause the points to weld together?
>
> 3. Which likely failed first?  Did one cause the other?
>
> 4. I'm guessing the points stuck together first, and caused the leaf
> spring to break, so first the points were always "closed", and then always
> "open".
>
> 5. Would any of this cause damage to anything else, e.g., the battery?
>
> Again, everything seems normal, now.  Battery holds charge well.
>
> Mike
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