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Re: Mark I, Now '73 B Alternator

To: <mgs@Autox.Team.Net>
Subject: Re: Mark I, Now '73 B Alternator
From: "Dan Ray" <>
Date: Fri, 10 Apr 1998 17:41:45 -0500
Haha, you took the "doh!" right outta my mouth.
I laugh at myself, and the MG list laughs at...errr, with me, right?

'73 B (I'm sure, but I don't know a damn thing about alternators, obviously)
-----Original Message-----
From: Douglas Gaither <>
To: <>
Date: Friday, April 10, 1998 2:38 PM
Subject: RE: Mark I, Now '73 B Alternator

>> -----Original Message-----
>> From: []On
>> Behalf Of Paul Hunt
>> Sent: Friday, April 10, 1998 6:13 AM
>> To: Dan Ray
>> Cc:
>> Subject: Re: Mark I, Now '73 B Alternator
>> Dan Ray wrote:
>> >
>> > This is interesting, and brings up a good point. I just thought it was
>> > normal for me to lose voltage while idling at around 900 rpm on my old
>> > "dynamo". I don't have a stereo, so the only thing noticable is the
>> > slowing and dim lights. I also assumed it was a generator and not an
>> > alternator, but now that I've looked at the Haynes it seems all neg
>> > cars had alternators. Now I'm confused. It's probably the original
>> > still holding its own except for these symptoms.
>> > I seek the wisdom of the list...any thoughts on my (more than likely)
>> > dynamo? Replace the brushes? I did this once on my VW bug (generator),
>> > I've learned my toy is a different B-reed altogether!
>> Clausager reckons negative earth and alternators came in in 67.  So,
>> are you sure your
>> car is a '73 and are you sure it has a dynamo?  Alternator powered
>> cars also exhibit
>> lights dimming and blinkers slowing at idle.  About 850 rpm is
>> required for charging,
>> idle speeds range from 500rpm to 850rpm depending on spec and I
>> suggest are usually set
>> with no aditional electrical load, although I usually set mine a
>> little higher to cater
>> for about half the fan load.  When you turn on lights, blinkers etc
>> the idle speed will
>> drop a little, therefore the alternator will not be charging,
>> therefore the running
>> voltage will drop from circa 14v to circa 12v, hence the
>> dimming/slower blinking.
>> PaulH.

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