Charging / Battery problem

blackbird98

hi guys n gals, have a problem with my Blackbird, hopefully some of you can offer some advice...........twice over the past 6 weeks, the battery has died / discharged while riding the bike.....started perfectly each day, but after a couple of hours...flat battery. it's a 98 model bb

Then it seems to rectify itself, and works fine.............so here's what i did......

charged the battery fully until this morning, armed with multimeter, this is what I got:
on standby..........12.44v
ignition on...........12.34v
ign + headlight....11.94v
back to ign only...12.18v
after 2 mins........12.23v
ign off..standby...12.42v
cranking.............10.02v
at 4k revs...........14.33v
at 1.5k revs.........14.66v..............?????
back to standby....13.56v

then on to reg/rec:

5 wires, 3 yellow, 1 red/white, 1 green

checked continuity with green wire & earth.........ok
checked voltage at r/w wire.............................12.43v
checked for continuity with each of yellow wires and earth....no continuity....all ok
checked AC voltage on yellow wires with engine running at approx 4k revs, this is what I got:

Y1 + Y2..............58.8v
Y1 + Y3..............58.9v
Y2 + Y3..............57.7v

So what does all this tell me?..........it would seem tht everything is fcukin perfect again this morning!!!!

what do you reckon guys and gals? dodgy reg/rec?

Lilliput69

blackbird98 wrote: »

hi guys n gals, have a problem with my Blackbird, hopefully some of you can offer some advice...........twice over the past 6 weeks, the battery has died / discharged while riding the bike.....started perfectly each day, but after a couple of hours...flat battery. it's a 98 model bb

Then it seems to rectify itself, and works fine.............so here's what i did......

charged the battery fully until this morning, armed with multimeter, this is what I got:
on standby..........12.44v
ignition on...........12.34v
ign + headlight....11.94v
back to ign only...12.18v
after 2 mins........12.23v
ign off..standby...12.42v
cranking.............10.02v
at 4k revs...........14.33v
at 1.5k revs.........14.66v..............?????
back to standby....13.56v

then on to reg/rec:

5 wires, 3 yellow, 1 red/white, 1 green

checked continuity with green wire & earth.........ok
checked voltage at r/w wire.............................12.43v
checked for continuity with each of yellow wires and earth....no continuity....all ok
checked AC voltage on yellow wires with engine running at approx 4k revs, this is what I got:

Y1 + Y2..............58.8v
Y1 + Y3..............58.9v
Y2 + Y3..............57.7v

So what does all this tell me?..........it would seem tht everything is fcukin perfect again this morning!!!!

what do you reckon guys and gals? dodgy reg/rec?

could be regulator rectifier but i would put my money on a loose connection

blackbird98

it's hard to know because it's charging now!!! all the connections look ok, so may just wait and see if it happens again