Electrical query - MVAgusta.net
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post #1 of 30 (permalink) Old 04-22-2018, 04:18 PM Thread Starter
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Electrical query

Hi all, my race 1078RR stopped in pit lane yesterday. It quit without warning and has no spark nor does anything happen when I hit the starter button. Have checked sidestand switch,clutch switch and kill switch and nothing obvious in the harness or under the tank. Fuses are all good as is starter relay.tried bump starting just in case and is stone dead. Pump is priming and dash works and goes through the usual sequence when ignition is turned on. Is there a relay perhaps that controls both starting and ignition(ecu) operation ? Thanks in advance , Mark. Also does anyone know if the latch,general and power relays are buried in the CPU and there is relay(possibly) behind the right side seat side cover that I canít find reference to in the manual, anyone know what it is ?

Last edited by cus; 04-23-2018 at 05:23 AM. Reason: More questions
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post #2 of 30 (permalink) Old 04-23-2018, 06:10 AM Thread Starter
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Ok, so the good news is the brutale is running again . The bizarre news is the problem was the stop light fuse (5amp) was blown.WTF.
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post #3 of 30 (permalink) Old 04-23-2018, 06:33 AM
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Glad you got it sorted. I too am having an electrical issue that sounds similar to this.

I went to start the bike this morning and the relay just clicked really fast while I held the starter button. Did this a couple of times and finally it started. Seemed to run fine all the way to work. Once there I tried to start it agian to check if it was problem, an now the bike doesnt start at all. The relay clicks and then all the light on the dash go off and then come on again slowly one by one.

I can't see any obvious fuses that are blown. Have the bike on charge in case the battery has somehow lost charge.

Has anyone else experience a similar issue?

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post #4 of 30 (permalink) Old 04-23-2018, 07:45 AM Thread Starter
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Funny thing is itís a race bike so doesnít even have any lights let alone any that are connected.Do a load test on your battery and/or check with a meter if it is charging if you get it running. First check battery connections to see if they are loose and ground leads which are equally important. There is a ground lead connection on the back of the motor which you need to check also. Check the fuse on the starter relay for corrosion, itís behind the battery.Good luck and keep us posted.
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post #5 of 30 (permalink) Old 04-23-2018, 07:56 AM
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OK, So i have checked all the fuses and they are OK. I cleaned all the leads connected to the battery. Voltages are all fine, dont know about running as cant get it started. I am starting to wonder if it is the starter relay as it clicks and all the lights go out but if I give it a wiggle they seem to come back. The the 4 pin plug on on the relay has a lot of white corrosion on it. I ad to replace the 40A fuse on the relay once already so I am wondering if the relay is bad.

will try to bump start it after I finish work.

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post #6 of 30 (permalink) Old 04-23-2018, 08:07 AM
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I should add to this that when I attempt to start the bike with a multi meter connected to the battery I don't see any voltage drop. Just a click from the relay.

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post #7 of 30 (permalink) Old 04-23-2018, 08:43 AM Thread Starter
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Try cleaning the four pin plug on the relay and disconnect and clean the two main terminals on the relay as well, bet your issue is there somewhere, even check the 40 amp fuse blades for corrosion, keep us posted on how you go.
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post #8 of 30 (permalink) Old 04-23-2018, 09:01 AM
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did all that aswell, cleaning the 4pin connector is a tad more difficult as I dont have anything to really get into the connectors.

will give it another go after work though and see where I get.

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post #9 of 30 (permalink) Old 04-23-2018, 09:33 AM
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It looks to me like the relays are located in with the fuses in what is known as the SPU: Service Power Unit or Service Unit.

I don't see any relays that would be where you describe. Can you post a picture?

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post #10 of 30 (permalink) Old 04-23-2018, 09:42 AM
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Originally Posted by Calcifur View Post
did all that aswell, cleaning the 4pin connector is a tad more difficult as I dont have anything to really get into the connectors.

will give it another go after work though and see where I get.
You can use a t-pin or similar to remove the terminals from the connector easily enough. Just insert in the gap at the bottom (flat) part of each terminal to wedge the retaining tab up and they should pull back with relative ease. Though I am sure to give someone a heart attack by saying it, soaking the corroded terminal in a weak acid like white vinegar for a few minutes is the easiest way that I have found to clean off the oxidation (make sure the bike is off). I rinsed with DI water and then electrical contact cleaner before greasing up and reinserting.

I have learned that removal of the lighting fuses can disable the starter. Trying to disable lights on my EBR and a friends RC390 at a recent track day by pulling the respective fuse resulted in preventing both bikes from starting, but still showing a normal on sequence. Of course, disconnecting the lights themselves did not affect the bikes from starting which is what I ended up doing.
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