Brand New Battery Issues - Page 2 - MVAgusta.net
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post #11 of 100 (permalink) Old 07-30-2018, 11:09 PM Thread Starter
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When looking on the back of the starter relay, it appears it does have a diode. At least something in a blue plastic sheathe that bridges those two connections.

I've been fairly busy recently, but should have time this weekend to fully go through the bike with the manual.

I've attached pics of what I believe to be the diode.
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post #12 of 100 (permalink) Old 07-31-2018, 06:51 AM
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I believe you are correct, sir.

Although it doesn't show on the 2007 wiring diagram....one is present on the 2006 diagram:

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post #13 of 100 (permalink) Old 07-31-2018, 06:51 AM
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What is the TENTH digit of your VIN?

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post #14 of 100 (permalink) Old 07-31-2018, 11:31 PM Thread Starter
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The tenth digit in the VIN is 7. Looking through the electrical diagrams, it appears that the positive battery lead directly connects to the starter solenoid. Is it possible to fry the solenoid without popping the 40amp fuse?

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post #15 of 100 (permalink) Old 08-01-2018, 05:51 AM
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Possible, yes....probable, no.

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post #16 of 100 (permalink) Old 08-01-2018, 05:53 AM
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That 7 indicates you, in fact, have a 2007 built bike. I suppose they could have carried over a 2006 harness.

OR...the 2007 electrical drawing is wrong.

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post #17 of 100 (permalink) Old 08-01-2018, 06:11 AM
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The diode in the 2006 diagram is only there to prevent back-EMF from frying the ECU electronics or starter button contacts

Relays "bounce" and this causes reversed current spikes to be present from the Relay coil. The Diode simply shorts these, and would not fry from reversing the battery polarity.

How is the starter relay connected to the starter button on a 2006/7 F4 ? Through the ECU? --

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post #18 of 100 (permalink) Old 08-01-2018, 06:26 AM
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Yes to the EMF reasoning.

And it appears it is a yes to the ECU controlling a signal to the start solenoid. Once all safety switches verified> ECU signal> start.

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post #19 of 100 (permalink) Old 08-01-2018, 06:33 AM
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Question

Thought so -- Would the ECU controlling the Starter relay also be the case for a 2004 750SR ??-- I have an intermittent fault where sometimes when starting the bike form cold, nothing at all happens when pressing the starter button-- After several - up to ten or twenty tries the bike fires up and runs just fine .. I hear no clicks clonks or other electrical or mechanical noises -- just ominous silence until it decides to fire up--

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post #20 of 100 (permalink) Old 08-01-2018, 07:16 AM
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I only have one F4 750 manual and it is in separate sections. There is no way for me to tell if it covers the SR.

Saying that, there is no readily apparent ECU connection in the diagram that I have.

Were it my bike, I would remove and clean the start solenoid. The probability is that it is a bit sticky and the magnet coil doesn't have enough EMF to draw the contacts closed.

Here is the testing procedure:

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'07 Ducati Monster S4Rs, '07 Ducati Monster 695
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