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-   -   What did i fry? (https://www.mvagusta.net/forum/20-maintenance-tech-issues-all-4-cyl-models/69218-what-did-i-fry.html)

v12gte 11-24-2013 07:30 PM

What did i fry?
 
I did something truly stupid and reversed polarity when hooking up the new battery. The 40 amp fuse blew, and yes, there were sparks.

When I finally figured out my mistake and when everything got reconnected properly i got a weird condition, and a no start situation:

-the oil light stays on, even with the key is out
-when i turn the key to the on position, only the battery light joins the oil light. The display does not cycle through and other lights do not come on. Nothing happens when i press the starter.

Oh, yeah. I have the new SPU, but maybe i fried that.
:(


Here is what i tried, without success:

-replacing the blown 40 amp fuse
-trying to hook up the original battery (thinking that i fried the new one)
-checking all the fuses under the tank (right side). All are ok.

Did i fry the EcU by reversing the polarity, or maybe just a relay?
Any clues about the weird warning light condition?
Do i still have something crossed up?

I do belive that the cables are now connected properly. Positive cables with the red rubber cover go to the positive terminal, and the two black cables coming out of the left side go to the negative terminal. I have some accessories hooked up. My led aux lights were on without the key, as well, so something might have happened to the "bridged ignition" circuit.

Not feeling terribly proud of myself....

Miko 11-24-2013 08:15 PM

2 Attachment(s)
What did You fried?

Probably a diode.

CAG 11-24-2013 08:21 PM

You fried the diode. It is located at the starter relay. You see it. It looks like a bare piece of wire. It's a $.10 fix.

v12gte 11-24-2013 09:08 PM

Quote:

Originally Posted by CAG (Post 782706)
You fried the diode. It is located at the starter relay. You see it. It looks like a bare piece of wire. It's a $.10 fix.

Thank you.
I have located the starter. It is between the alternator and engine block. It has one fat cable coming from it, and it connects to the "M" symbol at the block located to the rear of the battery. Where is the starter relay located, along with the bare piece of wire/diode? Is it at the same block that houses the 40 amp fuse.....with the B and M terminals on it? Or is the starter relay hiding next to the starter?

v12gte 11-24-2013 09:43 PM

1 Attachment(s)
I think i found the diode. This thread pic shows it. Now....i pried the black insulation off, but do i need to cut the wire to replace the diode?

v12gte 11-24-2013 09:55 PM

1 Attachment(s)
Here is a better pic of the diode. It is tiny! Do i just pull the bastard out and then jam the radio shack replacement back into the brass contacts?Attachment 99490


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eddypro 11-25-2013 01:16 AM

The 910 must be different to the 1078 ?,I blew my pc5 and bloody ecu, bad mistake that was

amcarguy 11-25-2013 01:22 AM

In the automobile world, when the battery connections are reversed, the Alternator diodes are fried along with several other things. I'd start with what is called a "fusible link". This is the savior between an electrical fire and nothing when an alternator shorts. Most likely you have fried the engine management system along with the spu, any diode and fusible link. I don't envy your task.

CAG 11-25-2013 08:07 AM

That diode acts as the fusible link. T do the job correctly, you should pry the brass connectors out of the plastic fittings, solder the new diode in place, and re assemble. You could get away with soldering the new diode to the legs of the old one. You can't just pull the old one out. It is soldered in.

On the F4 it is extremely unlikely you have done any other damage. The Brutale is a completely different story.

v12gte 11-25-2013 10:03 AM

As long as stupidity only costs money....i will be alright.
:)

Quote:

Originally Posted by amcarguy (Post 782922)
In the automobile world, when the battery connections are reversed, the Alternator diodes are fried along with several other things. I'd start with what is called a "fusible link". This is the savior between an electrical fire and nothing when an alternator shorts. Most likely you have fried the engine management system along with the spu, any diode and fusible link. I don't envy your task.



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