2000 F4s Electrical Issue - MVAgusta.net
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post #1 of 14 (permalink) Old 09-17-2016, 01:08 AM Thread Starter
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2000 F4s Electrical Issue

Hello everyone. Long time lurker here and I've learned a LOT!

Anyways, my 2000 MV was parked in the corner needing chain and sprockets for a while. (It's last in line to be ridden.)

Last test fire only, it had fuel leaks (Now repaired-it STILL had the plastic fittings!) and then the battery on a tender actually died.

New battery. Now when connected it 'powers' up with the key off:
Dash lights up, engine cranks. Tank is off, so no start. Pulled the dash fuses and the lights still stay on.

When I remove the second positive wire from the battery the lights go off. (The 'first' positive wire goes to the starter relay)

I can't find this second wire in any of my wiring diagrams; It does go to the rear of the bike- ECU?

Any ideas before I start tearing into my 16-17 year old wiring? Reg / Rec? I'm hoping not.

Thanks!
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post #2 of 14 (permalink) Old 09-17-2016, 04:05 AM
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Welcome to the forum.
Stuck power or latch relay, they're under your seat.

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post #3 of 14 (permalink) Old 09-17-2016, 08:45 AM
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Quote:
Originally Posted by havabusa12r View Post
(It's last in line to be ridden.)

New battery.
First, don't make it the last in line to be ridden.....

On the second piot...POLARTIY?

Follow the wiring diagrams....

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post #4 of 14 (permalink) Old 09-17-2016, 09:16 AM Thread Starter
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Thanks for the help. It's been a while since I've had electrical issues on the MV. I'll check it after work.


I stand corrected; I do see the second + wire going to #7 and #8 relays on the diagram. I'll do a site search to find the specs on these for the replacement numbers.
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post #5 of 14 (permalink) Old 09-17-2016, 09:19 AM Thread Starter
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My 'brain' must have scrambled the wiring and parts diagram sections.
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post #6 of 14 (permalink) Old 09-17-2016, 12:12 PM Thread Starter
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I'm not at home.

Does anyone know if the Power and Latch relay are the standard 30 / 40a type that's used in the 3-pack setup on the left side of the bike?
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post #7 of 14 (permalink) Old 09-18-2016, 02:21 AM Thread Starter
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I have both under seat relays removed. The non starter / secondary + wire still turns on the dash lights when connected to power.....Yes the key is turned off.

(The starter only wire does not light up the dash.)

I'm in no rush to make repairs, but I don't have a lot of time to troubleshoot it right now.

About 10+ years ago, my detailer swears he was NOT the one that got too much water around the headlight causing something to latch on. The headlight does NOT try to come on with the problem.

Thanks again!
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post #8 of 14 (permalink) Old 09-18-2016, 03:23 AM
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If I were you I'd use the time you have to study the wiring diagram and become knowledgeable in the basic system.

It's useful to print out a blown up scale of the diagram which makes it so much easier to follow.

The system isn't difficult to get a handle on.

If I get an electrical issue I sketch the circuit and components involved before I go anywhere near the bike. The sketch shows the wire colours and connections.
If I can't draw it I don't understand it. If I don't understand it I can't diagnose it. If I can't diagnose it I can't rectify it !

Read read read !!

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post #9 of 14 (permalink) Old 09-21-2016, 02:52 AM
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There are two wires on the negative side of the battery and it is easy to let one drop and not be seen. How do I know?. The bike lit up but wouldn't start
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post #10 of 14 (permalink) Old 09-22-2016, 08:04 PM Thread Starter
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Quote:
Originally Posted by trickydicky View Post
There are two wires on the negative side of the battery and it is easy to let one drop and not be seen. How do I know?. The bike lit up but wouldn't start

Thanks. My lights come on when the 'second' + wire is connected. It somehow hot wired itself?

Added to the unplugged list is the ECU. Same problem with the bike and with no time to dig into it.

My wiring diagram PDFs are very blurry and even worse when zoomed.
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