Regulator Grounds

[671M900]

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.

[671M900]

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.

[greenmonster]

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.

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.

[671M900]

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.

[greenmonster]

Yup, 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?

[671M900]

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.

[ducpainter]

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.

[671M900]

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.

[ducpainter]

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?

[671M900]

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:




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?

[ducpainter]

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.

[671M900]

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.

[ducpainter]

Yes it does.

The starter wire is not a ground though.

It goes back to the solenoid.

[671M900]

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!

[ducpainter]

Well, I meant the other end, at the starter motor is the ground, haha.

<snip>

Not exactly...