All right, one of the last set of wires seems to be grounds. I have one, which is just a ground strap with a rubber cap on it, which I assume goes straight to the battery. Then does the other go straight to the frame, or the engine?
Service manual says the the regulator should go straight to the battery, but the ground strap doesn't seem long enough to reach, unless I'm missing another wire. I do have a small gauge wire with ring terminals that came with the bike.
Haynes manual for the 98-99 M900 shows TWO grounds to the regulator, one to the frame. However, these looks like two wires that come from the regulator itself, while the older, 93-97 implies that the ground goes straight to the battery.
On a related but different topic, the starter solenoid goes to the positive side of the battery right? Opposite the side going to the starter motor.
the wiring routing diagram in the service manual is fairly vague. The ground cable from the battery seems to go down near the alternator and pickup area, and there is indeed a bolt hole there, as indicated by the wiring diagram, however, the actual ground that I have is nowhere near that long.
QuoteOn a related but different topic, the starter solenoid goes to the positive side of the battery right? Opposite the side going to the starter motor.
Yes.
Reg -> batt wiring, there should be an fuse holder w a 30A in it.
There should also be a thick ground frame-engine behind crankcase breather.
Quote from: greenmonster on October 25, 2010, 04:16:48 AM
Yes.
Reg -> batt wiring, there should be an fuse holder w a 30A in it.
There should also be a thick ground frame-engine behind crankcase breather.
Yup, the one behind the breather goes to the rearset mount, rights?
The one with a 30A big blade fuse goes to the ground, right? There's no ring terminal or anything that goes to the regulator right? The ground itself is already wired into the regulator? The black ground that comes from the harness comes from the 30A fuse right? There's a 40A in there. The black ground in question comes out of the same part in the harness in the 30A fuse.
QuoteYup, the one behind the breather goes to the rearset mount, rights?
Yup.
And, IIRC, Ducati swtched from 1phase to 3phase 1998, my WS manual & bike is 1phase.
So a bit tricky f me to help w this reg issue.
Work out of town again, so, koko might help?
Quote from: greenmonster on October 25, 2010, 06:57:51 AM
Yup.
And, IIRC, Ducati swtched from 1phase to 3phase 1998, my WS manual & bike is 1phase.
So a bit tricky f me to help w this reg issue.
Work out of town again, so, koko might help?
Thank you for the help though! As far as I can see, there are only two more wires left for me to figure out, and they're both black with ring terminals. One which seems to come from the regulator with the 30A fuse (Right now a 40A), and one, lone 6 inch or so battery ground with the rubber cap on it.
My 96 M900 has the battery strap ground which connects underneath the battery box to the frame bracket and a ground at the regulator.
It also uses the ground strap behind the breather.
Mine is the single phase alternator.
I think all the grounding is the same until they went with an ecu for ignition.
Quote from: humorless dp on October 25, 2010, 07:15:55 AM
My 96 M900 has the battery strap ground which connects underneath the battery box to the frame bracket and a ground at the regulator.
It also uses the ground strap behind the breather.
Mine is the single phase alternator.
I think all the grounding is the same until they went with an ecu for ignition.
Funny, I was thinking "The only possible place for this thing to ground is under the battery box, where it bolts in"
For the ground at the regulator, what does it look like? Big heavy gauge cable? Ring terminal to the regulator mounting bolt? Or is it grounded by bolting onto the frame. I don't see a ground at the regulator itself, but a ground strap coming from the harness where the 30A emerges. I cut open the ground strap to reveal three beefy wires, the same gauge as those coming from the regulator, which I assume to be grounds, I hope.
Not heavy gauge. Similar gauge to the rest of the regulator wiring.
It has a ring terminal, and IIRC two wires crimped into it, which was between the reg and it's mount with the mount bolt going through it.
I'd have to look at my bike to refresh my IZ_ memory.
Do you have any pics of what you're looking at?
edit...
would a scan of the factory wiring diagram be of any help?
Quote from: humorless dp on October 25, 2010, 08:13:39 AM
Not heavy gauge. Similar gauge to the rest of the regulator wiring.
It has a ring terminal, and IIRC two wires crimped into it, which was between the reg and it's mount with the mount bolt going through it.
I'd have to look at my bike to refresh my IZ_ memory.
Do you have any pics of what you're looking at?
edit...
would a scan of the factory wiring diagram be of any help?
I have a factory service manual for the 900, but I'm afraid it's for the earlier, 93-97 models.
This is what I'm looking at:
(http://img.photobucket.com/albums/v345/aaronferrer/IMG_0133.jpg)
(http://img.photobucket.com/albums/v345/aaronferrer/IMG_0135.jpg)
Basically, this wire either goes to the battery or to the regulator. Does the negative post on any of your monsters have two ring terminals?
humorless dp, where does the other end of that regulator ground go?
The wires go into the harness.
I've never cut it open.
The last pic looks like the battery ground cable judging by the gauge.
I'd open up the harness on the wire in the first pic and see what color the wire is.
If it's black and it's near the regulator it's the ground.
My diagram is for an early bike too.
Yes, in the first pic, the wire that's going upwards in the same wire with the ring terminal in the second picture. It reaches the regulator, so I just put it there, and left the ground strap with the rubber cap on it. So, the regulator ground goes into the harness, right? That's the wire I grounded to the regulator. From what I can see, that's the only ground that goes into the harness, the other two grounds are battery to frame, and engine to frame, and the starter.
Yes it does.
The starter wire is not a ground though.
It goes back to the solenoid.
Quote from: humorless dp on October 27, 2010, 03:56:33 AM
Yes it does.
The starter wire is not a ground though.
It goes back to the solenoid.
Well, I meant the other end, at the starter motor is the ground, haha.
Looks like I got her all sorted out, rigged up a battery and hit the start button, she turns! YES!
Quote from: 671M900 on October 27, 2010, 06:22:17 AM
Well, I meant the other end, at the starter motor is the ground, haha.
<snip>
Not exactly...
QuoteThe last pic looks like the battery ground cable judging by the gauge.
+1, same on mine.
QuoteI meant the other end, at the starter motor is the ground
Starter motor chassie grounds through engine, I guess.
+ positive goes from battery to solenoid & then to + screw, at bottom of st motor.
Damnitall. The wire I posted is actually 3 wires wrapped in a sheath, so it's not a big gauge wire. So does anyone have two grounds to the battery?
Quote from: 671M900 on October 27, 2010, 07:17:50 PM
Damnitall. The wire I posted is actually 3 wires wrapped in a sheath, so it's not a big gauge wire. So does anyone have two grounds to the battery?
What color are they?
Quote from: humorless dp on October 28, 2010, 03:13:48 AM
What color are they?
All are black, so I assume ground, but where? Also, the way they come out of the harness, they exit towards the rear, not the front, as are all the wires in the area, so I am going to assume that they go to the ground. I attached it to where the battery's ground is, under the battery box.
93-97 monster implies that the ground for the regulator is a ground strap itself
(http://img.photobucket.com/albums/v345/aaronferrer/IMG_0146.jpg)
98-99 monster implies that the ground is in the harness already.
(http://img.photobucket.com/albums/v345/aaronferrer/IMG_0148.jpg)
If you ever cut a Ducati wiring harness apart you'd see that it isn't built like it's drawn.
Don't over think this...
As long as the engine is grounded to the chassis/trellis...
the harness to the chassis...
and the battery to the chassis...
You have ground...doesn't matter where the actual wires connect. They did add some 'ground straps' to make sure sensitive items were adequately grounded.
All the black wires are grounds..it will be fine.
I just don't want to be stranded because the battery wasn't charged enough because it didn't have the correct ground to the regulator, or be stranded because the regulator gave out, due to poor grounding.
Maybe the easiest thing to do is run the bike with that strap grounded at the regulator and then grounded to the frame under the battery box (with the negative battery cable) and see which charges best. The ground strap emerges is a way opposite the regulator, so I think I'll go with grounded to the frame for now. Grounded to the regulator put it in such an awkward position. Other than that, I think i'll leave it at that, Thanks for the help guys!
I think that the wires in question are to be put on a ground, they don't lead to a ground itself, like, they are the harness ground, right? I don't think I was making that connection earlier, hence my overanalysis.
My OEM wiring goes/went:
Engine ground to rearset bolt for grounding motor and frame together.
Ring terminal on wiring harness goes to bolt below battery box.
Ring terminal for ground cable to battery also goes on this bolt, and goes on negative battery terminal.
Starter solenoid connects by plug to wiring harness, one battery terminal & cable end goes to starter, other goes to plug that goes into wiring harness by battery, terminating on battery positive terminal.
My experience has taught me to:
Positive side:
Starter solenoid has direct connection to positive battery terminal. Upgrade to beefy wire.
Starter solenoid to starter wire needs beefy wire upgrade too.
Wiring harness has direct connection to positive battery terminal.
Negative side:
Negative battery terminal to frame below battery box. Upgrade to beefy wire.
Engine to battery terminal or to frame below battery box instead of to rearset bolt. Upgrade to beefy wire.
Wiring harness ring terminal to frame below battery box.