I was wondering what sort of voltage I should see max to the battery. I read through the section in the service manual and frankly I still don't know.. I'm seeing about 14v between 3-7k but above that it is spiking up to about 15v... is it time to look for a new rectifier/voltage regulator before I fry something?

Checj page 2 of the 750 FAQ at the tiop of the 750 forum. About 1/2 down there is a voltage regulator thread. You voltages sound OK tho.

I would say, that 14.7 is totally maximum(to normal acid battery), but how accurate is Your multimeter? and U should check it direct from battery poles. If 15.0V is real, then it would already boil Your battery little.... 14.0V is best to acid battery, if thinking long lifetime, not more....

You have to check, what battery U have and every battery supplier know exact charching voltage / current to they batteries, So, check, what batter You have. If its gel type, then it accept/need little higher voltage. Anyway i would say, that if its old style acid battery, then 14,7V is maximun and if its gel type, then 15V is maximun. Battery is not good to charge with "too high" voltage/current, if thinking its lifetime. Less current feed is allways better to battery charge.

I bought just few weeks ago very good "pulse charger" with microprocessor and i can look closer about those voltages/currents, how it charge battery. Its just suchkind charger, that You can leave it to bikes battery for very long time and it doesnt destroy battery by feeding too much current to it with too big voltage.

In cars currently they have rised little by little that charging voltage to up to keep battery in full charge, that all this new elecronic/"black boxes" in car work enough well. And battery manuafacturer have also started to make such batteries to cars, what can handle better suchkind higher charge voltages. As example in my Opel Astra charhing voltage is 14.7 V and it have maintaine free old style acid battery. I have to change quite often new bulbs to it caused by that 14.7V charge voltage....

So, higher voltage means more full battery, but less lifetime to normal bulbs. Its good to connect voltage meter(digital multimeter is very cheap) to bike (direct to battery terminals some way!) and monitor some times, how it charge battery. Ducati should start load battery just little higher from idle speed(1200-1300 RPM) in about 1500 RPM and stay quite stable till battery is full with maximum ab. 14.7V

If voltage is over 15V, then You should start to be very worried about it.

Looks as though the rectifier/voltage regulator is going bad. I had it spike to 16 after it sat all day and then I tried it.... after it ran for a bit I didn't see it go past 15, I ran a short trip over the mountain and the VR was pretty warm but the battery didn't get warm a bit..... to me that seems as though at that point it must have been working ok. What I get from this is that it isn't working correctly when there is a high demand on it but once the battery is fully charged it seems to be partially working???? My experience is with automotive electrics and this is a bit different... a regular VR either works or it don't in my experiences. Is it possible for this unit to just be weak and work somewhat properly under a lighter load? I'll have to see if I can find another one and swap it out.....
Thanks Guys,

Have You check those round connectors witch are between stator and rectifier(in left side close radiator) ??? They are in very bad condition in many 907s, like mine was also, when i bought bike and they nearly connected to each others and made shortcut, what can surely cause bad damages to rectifier/regulator and to rotor. If They are corroded, then it can sometimes charge and sometimes no. One of my friend had just samekind problem, as You have, in his Elephant 900 GT and it was regulator failure in that case... Hopefuly You managed to fix it Btw, if those connectors are in bad shape, then its better to weld wires together WELL and insilate them very well. That is best way to fix those bad connectors and i did so and since no anykind of problems. Same time i changed to Electrex unit, but that original was 100% luckily ok, so i sell it to one of my friends and its still going strongly in his 907IE.

Radiator = cooler in some languages!

On the left side there will be wires coming out of the cover that go from the alternator to the RR. As has been written, the connectors can corrode so they need to be checked.

Before you do anything else (other than checking those connectors) you must find and clean EVERY ground (earth) point. The paso has crappy electrics and is VERY sensitive to electric corrosion and faults. If you go to the 750 FAQ you will find and upgrade to the electrics than will fix 99.9% of your electric issues.