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General Category => General Discussion => Topic started by: tpeever on May 08, 2015, 02:35:13 PM

Title: Italian polarity symbols
Post by: tpeever on May 08, 2015, 02:35:13 PM

On the face of the Marelli ignition coil on my V700, the right hand side (coil facing right side of bike) is marked "B+" and the other side "D". I assume the former is the positive side and should be connected to the blue/black wire from the fuse panel and the latter is negative and should be connected to the distributor?

Title: Re: Italian polarity symbols
Post by: Kiwi_Roy on May 08, 2015, 02:46:30 PM

I think that would be a safe assumption.
I would work either way but there is a tiny advantage having it correct, a few hundred extra spark Volts

I have no idea if the attached is true or BS
http://mgaguru.com/mgtech/ignition/ig104.htm


LaMojo has the best answer so far  ;-T
I can verify that, I grew up with steam radio.

Title: Re: Italian polarity symbols
Post by: canuguzzi on May 08, 2015, 02:51:18 PM

Here are the proper symbols:


Positive:

http://www.dreamstime.com/royalty-free-stock-photos-man-arms-open-happy-isolated-over-white-background-image32058588


Negative:

http://www.belfasttelegraph.co.uk/news/northern-ireland/man-lies-supine-on-scenic-northern-ireland-walkway-but-how-many-people-stop-to-help-31155036.html

Title: Re: Italian polarity symbols
Post by: mtiberio on May 08, 2015, 04:00:49 PM

Digital ohmeter?

Title: Re: Italian polarity symbols
Post by: LaMojo on May 08, 2015, 04:26:52 PM

B+ is used on almost all electronic schematic diagrams beginning early in the tube era. Means Battery Positive supplying a circuit.

Title: Re: Italian polarity symbols
Post by: dilligaf on May 09, 2015, 07:09:31 AM

Quote from: LaMojo on May 08, 2015, 04:26:52 PM

B+ is used on almost all electronic schematic diagrams beginning early in the tube era. Means Battery Positive supplying a circuit.

  ;-T and green is ground the world around.  :BEER:
Matt

Title: Re: Italian polarity symbols
Post by: tobydmv on May 09, 2015, 08:23:56 AM

B+ is battery positive
D is dinamo/dynamo

At least that is what my 1955 Moto Morini Turismo uses...your D could be distributore ;D

Title: Re: Italian polarity symbols
Post by: tpeever on May 09, 2015, 09:50:41 AM

Thanks for all the great answers guys! Sounds like I have my coil wired up for optimum spark! Startup after two years restoration is hours away!!

Batteria e distributore. Love it!