You should be getting close to 14.5 volts when running at those revs. Have you checked the earths? There are lots of threads on here if you do a search for electrical problems.

 

As mentioned it does seem a bit low. Not knowing the digital voltmeter you installed or where
you installed it I would put a known accurate multimeter across the battery just to compare
when its running.

 

rd07a, mosfet fitted, 1.1k tick-over i get 12.2. But when revs raise just a bit 12.6/7 with lights on. Without lights 14+.

 

I'm still on the original reg rect and battery

Battery 12.87v

With engine running lights off 14.4 and lights on 13.9

 

Thanks for the readings guys.... I've measured the resting battery voltage a few times now and it
seems a bit low (typically 12.3 Volts). I am wondering if the battery is not in the best health.
When the bike has been running a while and then switched off resting voltage is about 12.7 Volts.
I've started riding with only the parking lights on during the day now so haven't had to bump start
again. So probably get a new battery and see how things go.
Checked continuity between battery negative and frame and ok, and Open circuit between Positive
terminal and frame.
Did continuity checks on the stator, all seemed ok, and no phase shorting, so seems ok. Also did
an AC Voltage check as seen on youtube - what voltage should be appearing from the block connector
that connectes to reg/rectifier?

 

Just some input on the issue , I had problem with starter so couldn't figure out problem, strip starter still problem not fixed .
Then new problem with charging , so first thing I check regulater rectifier , had spare one , now effect , then checked solenoid ....connection completely melted .
So order new parts here couple links if any use to anyone , o bike is 90 rd4

http://www.ebay.com/itm/181259083876?redirect=mobile

http://www.ebay.ie/itm/171194016861?redirect=mobile


VAL
Africa Twin , BMW R1100RT, 2 Bikes twice is happy

 

Check all 3 yellow wire from the stator into the regulator / rectifier loom if it looks hot like mine did either replace the plug. Ive just soldered and shrink raped all 3 of them. Im now back to 14 + volts happy days :thumbup:

 

Yeah packman, I had to hot wire solenoid for couple day till get new, but voltage still Low so I repleysed rectifire too and now voltage back to 14, happy days. In the end rectifier and solenoid at fault. just glad to be back on the road.

 

Just got me thinking, it must be faulty connection on solenoid cost to regulator failure or vs versa.

VAL
Africa Twin , BMW R1100RT, 2 Bikes twice is happy

 

check the battery leads/connection are solid & blah di blah. chances are its the battery. I've just replaced both R/R's on the twins, fried both batteries within a week. No problems since. I presume you've hard wire/soldered the 3 yellow wires, ie; 3pin plastic connector block removed?

 

No my connector melted on solenoid where 30 amp fuse
I don't think connector you talking about will melt , voltage to low on them if I'm correct .
VAL
Africa Twin , BMW R1100RT, 2 Bikes twice is happy

 

it's a common fault, caused many a fried battery, reg/rec, alt/stator. I think i remember the connector melting on the solenoid, i heard/didn't hear the usual starter motor sound. After a removing & checking etc all was fine. maybe butt end of a hammer tap may have done the trick.