Hi i have replaced my alternator on my vfr 400 nc 30 . I had a problem with the battery not charging and checked the stator and it was burnt. The reg/rec seemed fine. The bike charges within the correct specs 14.2 volts @ 5000rpm.
As soon as i switch the lights on the battery drains quickly . The voltage drops. The charge keeps dropping.???

hello-
first of all i believe your reg/rec is in perfect working order,the fact your battery is getting a charge(with no lights)and as much as 14.2 volts@5000rpm would indicate the reg rec doing it's job correctly.

for the battery to be receiving 14.2 volts then the alternator must be working

when you put the lights on @5000rpm what is the charge rate?how fast does it drop?

have you experienced any problems out and about e.g,does the bike die after a certain amount of time?and have you had the battery go dead?



william

It could be that your reg/rec was popped while your stator was dying or that the battery has been killed and can't hold the charge/demand. It is puzzling that it holds 14.2V @ 5k rpm. Does the reg/rec get excessively hot when the lights go on? Also have you disturben any of the wiring at all?

The reg/rec does not get hot . If i keep the revs @ 5000k and switch the lights on the voltage drops at about 1 volt per 10 seconds thats at the battery.
I did the light mod on the bike about 1 year ago (relay for the up sized bulbs) Its the only electrical mod i've done , i also replaced my battery about 2 months ago , because it was not charging, when the stator was faulty. I did notice when i charged the battery it made a loud hiss bubble sound.

does the volts continue to drop 1 volt per 10 seconds or does it finally stop and hold at a certain voltage.........

als have you experienced the battery going dead whist out and about?




william

savfr wrote:The reg/rec does not get hot . If i keep the revs @ 5000k and switch the lights on the voltage drops at about 1 volt per 10 seconds thats at the battery.
I did the light mod on the bike about 1 year ago (relay for the up sized bulbs) Its the only electrical mod i've done , i also replaced my battery about 2 months ago , because it was not charging, when the stator was faulty. I did notice when i charged the battery it made a loud hiss bubble sound.

Sounds like your battery is broken.

what did you charge it with?

The battery seems to be the problem to me.
Thanks for all the help iv'e sold the bike so not to worry anymore.

i would have tried another battery first just to see if it was any different

i hope you told the new owner about the problem



william