Topica Loopframe_Guzzi Archive
 

Subject: RE: Eldo REgulator Performance

Author: Gary Cheek

Date: Sep 4, 2001, 11:50 AM

Post ID: 1708111734

Another cause for loss of residual magnetism is disassembly of the
generator. You will often get by without doing so but it is easy to be
sure!
This is why they always recomend polarising rebuilt generators. The
short story is there is no harm done by polarising so ,if you have had
it apart or have any reasson to believe you may have disturbed the
magnetism the effort to polarise is well worth while.
Tom Bowes wrote:
 
Derek Hamlet wrote:
 Tom,
I'm sharing this with the whole list since I'm assuming that other
Ambo/Eldo owners may be equally bemused by the chargins system.
A couple of more questions. The various internet sites about
regulators,
generators alternators etc., seem to spend numerous bytes going on about
polarizing the system. I always thought that when you put in a new
reulator, yo simply unbolter the old one slapped in the new one, turned
the
key, made sure it was both charging and cutting out then drove off into
the
sunset. How important is this polrizing.

Derek,

Polarizing is relatively unimportant, unless you have changed the
generator, or the bike has been sitting for a long, long time. The only
reason that it is necessary is because a generator relies on residual
magentism to get the thing producing voltage. Residual magnetism tends
to disappear over time, or if the generator is dropped or reverse
polarized. This is why they tell you to polarize a new generator because

it has likely sat on the shelf for so long that it has lost its
magentism.

 My other question involves solid state regulators. Is this possible
with a
generator. The Bosch solid state regulators only seem to have D+, DF and

D-
pins. The other connections seem to be involved with starter relays and
stators and rectifiers (diode boards). Am I correct that one cannot do
a
solid state regulator on a generator system.

That is correct. The alternator has a diode assembly which keeps current

from flowing back into it when the alternator voltage is below the
battery voltage, or when the alternator is turned off. This is why the
B+ lead from the battery can connect directly to an alternator, but must

go through the regulator for a generator system. I suppose that you
could add a big diode between the generator and the battery and get
things to work, but it would require a fair bit of experimentation.

 And finally, do I need to worry about the polarizatin on my generator?
I
did polarize the new (now non regulating) regulator as per the
instructions
inthe box.

No, put the new regulator on and run it. The generator should already be

polarized, unless you took it out and dropped it. The regulator does not

require polarizing to work.


Tom

'70 (July '69) Ambassador
99.8% Complete, 10% Left To Go
'82 V50-III
Shelby Township, Michigan



Gary Cheek

1971 Ambassador (I think it's sold)
1972 Eldorado Police
1974 Eldorado 4LS/Amal carb civilian

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