Subject: Re: generating system
Author: Charles D. Mullendore
Date: Jun 17, 2003, 3:37 PM
Post ID: 1713426984
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Hi Scott,
The Marelli generator probably just needs to be polarized. Below are two posts I
saved on how to do it. The Marelli equipment works just fine, no need to replace
it. If in the event you do, you'll need to use a Bosch (or equivalent) regulator.
Cheers,
Charlie
| Search the list archives, but I believe it was to tap the white wire (DF+, center wire if I remember correctly) for a brief second to the positive battery terminal. You will see a nice spark. Had to do this after my gen was rebuilt, initially tried it to see if the system would charge but the gen was toast as well as the VR. You need to know the defference in the method of polarizing an INTERNAL-ground gen. and an EXTERNAL-ground gen. To determine which system you are dealing with look at the brush holder that is connected to ground. An internally grounded gen. will also have ONE of the field leads connected to it; an ext. grounded gen. will have no other wire connected to the grounded terminal. With an INTERNAL ground (such as the generators used on Guzzis) you polarize by DISCONNECTING the FIELD lead and MOMENTARILY touching it to the BAT terminal on the regulator. With an EXTERNAL ground you just momentarily connect a jumper wire from the BAT to the GEN or ARM terminals of the regulator. I have seen manuy situations where everything else looks okay, but the generator was not working, and that was remedied by re-polarizing. Folks take the generator apart to replace brushes and after reassembling, fail to re-polarize. Do it by the book, and avoid simple problems! |
Scott wrote: Just got my 70 ambo up after 9 years down,and every thing works but the morelli charging system,the dynamo(?) was rebuilt shortly before the engine lunched,and the regulator was replaced with an after market unit from MI.My inclination now is to replace it with a Bosch system,does anyone here have a usable one to sell,or even a decent rebuildable one?Can I use my existing marelli replacement regulator with a Bosch generator,or do I have to match it to a Bosch unit?Thanx in advance...Scott |
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Hi Scott,
<br>The Marelli generator probably just needs to be polarized. Below are
two posts I saved on how to do it. The Marelli equipment works just fine,
no need to replace it. If in the event you do, you'll need to use a Bosch
(or equivalent) regulator. Cheers,
<p>Charlie
<br>
<blockquote TYPE=CITE>
<pre>Search the list archives, but I believe it was to tap the white wire
(DF+, center wire if I remember correctly) for a brief second to the
positive battery terminal. You will see a nice spark. Had to do this
after my gen was rebuilt, initially tried it to see if the system would
charge but the gen was toast as well as the VR.</pre>
</blockquote>
<blockquote TYPE=CITE>
<pre>You need to know the defference in the method of polarizing an INTERNAL-ground gen. and an EXTERNAL-ground gen. To
determine which system you are dealing with look at the brush holder that is connected to ground. An internally grounded gen.
will also have ONE of the field leads connected to it; an ext. grounded gen. will have no other wire connected to the grounded
terminal. With an INTERNAL ground (such as the generators used on Guzzis) you polarize by DISCONNECTING the FIELD lead
and MOMENTARILY touching it to the BAT terminal on the regulator. With an EXTERNAL ground you just momentarily connect a
jumper wire from the BAT to the GEN or ARM terminals of the regulator.
I have seen manuy situations where everything else looks okay, but the generator was not working, and that was remedied by
re-polarizing. Folks take the generator apart to replace brushes and after reassembling, fail to re-polarize. Do it by the book, and
avoid simple problems!</pre>
</blockquote>
<br>
<blockquote TYPE=CITE>
<p>Scott wrote:
<br>Just got my 70 ambo up after 9 years down,and every thing works but
the
<br>morelli charging system,the dynamo(?) was rebuilt shortly before the
<br>engine lunched,and the regulator was replaced with an after market
unit
<br>from MI.My inclination now is to replace it with a Bosch system,does
<br>anyone here have a usable one to sell,or even a decent rebuildable
<br>one?Can I use my existing marelli replacement regulator with a Bosch
<br>generator,or do I have to match it to a Bosch unit?Thanx in
<br>advance...Scott
<br> </blockquote>
</html>
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