04 750 brute,dead electronic problems with 2nd gen SPU - MVAgusta.net
 
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post #1 of 8 (permalink) Old 04-03-2016, 10:20 AM Thread Starter
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04 750 brute,dead electronic problems with 2nd gen SPU

Hi guy's, i have a '04 Brutale and experiencing typical SPU problems (dead electronic except a few red dash lighs that go on when keys are placed and also stay on when keys are removed, etc) i removed the SPU and it is a "new" one without resin, 12 fused, black covers. It has also been to Carmo electronics for diagnose (no problems were found). I'm not sure where to start troubleshooting, the battery is weak and has possibly been placed the wrong way (switched polarity). Fuses are all fine. Haven't cheched diodes yet, i cant find them.I did found some bad (but not short-circuit) connections on unprofessionally installed led indicators and bad wiring on the power commander.
Did anyone have problems with the new SPU?
And which parts grt damaged when the battery is installed with reversed polarity?
Where is the infamous reverse polarity diode located?
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post #2 of 8 (permalink) Old 04-03-2016, 05:12 PM Thread Starter
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After doing some diagram digging i noticed that there is one (black) wire too much connected to the positive battery terminal. I don't have the bike here so i can't check now but if there is a ground wire connected to the power terminal and there are no burned fuses, are there parts going to be fried?(ecu,psu,relais etc)?
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post #3 of 8 (permalink) Old 04-03-2016, 08:09 PM
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Hi mate.
Welcome to the forum, sounds like you have a few things going here.
Firstly, make sure the battery is properly charged.
I've not seen a SPU with "no" resin in it, but I don't have a Brutale anymore so just going on what I've seen on the forum, others might chip here. Maybe show us a picture?
Your fault sound perfectly SPU, but with all going on you might have damaged the Eprom in the ECU too.

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post #4 of 8 (permalink) Old 04-04-2016, 07:08 AM Thread Starter
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Quote:
Originally Posted by Donsy View Post
Hi mate.
Welcome to the forum, sounds like you have a few things going here.
Firstly, make sure the battery is properly charged.
I've not seen a SPU with "no" resin in it.
Your fault sound perfectly SPU, but with all going on you might have damaged the Eprom in the ECU too.
Thanks Don. Is there a way to tell if the eprom is dead? Visually or is it measureable?
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post #5 of 8 (permalink) Old 04-04-2016, 07:58 AM
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No, it really sound like you've got a cooked and or modified EPROM in there.
The names Dons or Donsy.

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post #6 of 8 (permalink) Old 04-04-2016, 11:58 AM
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Quote:
Originally Posted by Donsy View Post
I've not seen a SPU with "no" resin in it, but I don't have a Brutale anymore so just going on what I've seen on the forum, others might chip here. Maybe show us a picture?


Robbedoes, sounds like dutch ( or belgium). Get your wiring sorted and a proper full batt. components both side to positive will not burn, only when reversed connected.

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Last edited by hb88xx; 04-04-2016 at 12:02 PM.
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post #7 of 8 (permalink) Old 04-04-2016, 03:05 PM Thread Starter
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The bike is running again! I compared all the wiring on the bike to the diagrams and i found a lot of bad ground wires and mixed up wires on the battery. After i rewired everything around the battery the display got back to life and after fiddling around in stupidity a bit because i forgot about the start protection when the bike is standing on the kickstand the bike also started! I didn't got to check if everything works as it is suppose to, but I'll get to that soon.
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post #8 of 8 (permalink) Old 04-04-2016, 03:10 PM Thread Starter
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[QUOTE=hb88xx;1898665]
Quote:
Originally Posted by Donsy View Post

Robbedoes, sounds like dutch ( or belgium). Get your wiring sorted and a proper full batt. components both side to positive will not burn, only when reversed connected.
Thanks guys, i am going to redo the bad wiring and get a new battery and see if everything is stable. I did notice that the lights are dimming on the idling speed and that the fan did not come on at 90deg C. I'm not sure if that is normal or not.
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