2005 f4 starting problem - MVAgusta.net
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post #1 of 4 (permalink) Old 06-10-2019, 11:19 PM Thread Starter
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2005 f4 starting problem

Hi everyone.
I was distracted and connected my battery in reverse. There are no diodes I can find. When I bump the starter I get a solid click from the relay. I replaced it even though the original was testing ok. Same mess. Any ideas on what to check out? If I touch the starter wire to got it turns over but no spark. Seems the ECU is mad about everything.
Thanks for reading. The sun's out and I miss the road.
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post #2 of 4 (permalink) Old 06-11-2019, 07:46 AM
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Well, Pikachu...welcome to the club of MV ownership...and the smaller club of those who have blown up their electrical systems by installing the battery incorrectly.

I don't know what you are using to try and find your diodes (there are four on your bike assuming it is a 2005 F4 1000S); the best resource is the website where member Donsy has archived most of the manuals for free download: Team Double 3 Racing | MV Agusta

Being certain of the year and model is imperative as wiring colors and components changed frequently in the MV shop.

Now, on to your problem:

We'll start with the battery mounts on its side with the negative terminal forward. Hopefully you have figured that out.

The diode locations are as follows: Right hand side of the rear subframe in a removable holder are two CPU Protection Diodes (Location and test method below). On the left hand side of the bike is the Start Solenoid, as you have replaced this you know the location...the diode is on the backside at the connector as shown in the picture below (RED box). The last diode is on the General Feed Relay, which is the first relay of the three in the holder that houses the Start Solenoid.

(For future reference, the middle relay in that holder is the intermittency and it controls the turn signals)

I'll assume you checked the left fuse on the Start Solenoid for continuity. It is power distribution to the bike. The other fuse on the Start Solenoid is a spare ready for use.

The following are excerpts form the shop and parts manuals:

General Feed Relay Diode

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Start Solenoid Diode

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CPU Protection Diodes

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CPU Protection Diodes Location

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#3 is the General Feed Relay, the Arrow is the Start Solenoid

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CPU Protection (Safety System) Diodes location and Test Procedure

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Yellow Arrow is the General Feed Relay. The person's Thumb is on the Start solenoid.

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post #3 of 4 (permalink) Old 06-11-2019, 09:48 AM
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Welcome to the family ....!!! And where in the world are you located?? Please add that to your profile.

Chuck has already given you all the info you need (he is really great about including pages from the manuals!). This subject has been covered more than a few times in the forum. Do a search and you will see.

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post #4 of 4 (permalink) Old 06-11-2019, 07:46 PM
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One would think, perhaps wishfully that, on a 20+ thousand dollar bike, the mfgr would have installed certain safeguards against doing this. Sure, you can call it "idiot-proofing" but, after just installing a new batt on my 05 AGO and after reading posts re same, it's shockingly easy to do wrong. Ranting I guess, but the message here is always to be dead nuts in the zone when you're working on these things....

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