Not charging, rectifier?

[g1b50n]

Hello everyone probably covered many many times. Put new fully charged battery on my nc30 last night, started her up, ran fine for a few minutes, multimeter readings were 14.3v on idle with no lights then she cut out. Started it back up this morning took some getting going.

Once running checked with multimeter and battery was 12.3v and falling, kept falling until it cut out, not charging. Ive checked plug to rectifier all yellow wires and green and red wire all seem fine, the rectifier is an aftermartket one with no cooling fins, it does look a bit tired tbh. Could anyone please help me to make sure its the rectifier. Ive currently got my battery on charge. Ive ordered a rectifier just in case anyways, please help as i hope its not the alternator

[Drunkn Munky]

Theres a detailed guide to checking the electrical system in the documents section on the home page, that should sort you out.

[g1b50n]

Theres a detailed guide to checking the electrical system in the documents section on the home page, that should sort you out.

Wheres that mate? I cant seem to find it lol

[Drunkn Munky]

http://www.400greybike.com/docs.htm

[Neosophist]

If you still have the battery out and not connected measure it's voltage for a day or two.. if the battery has a problem it'll drop quite low usually quickly.

Strange as the battery was fully charged, then dropped to dead very quickly.. were your lights on?

Even without a reg/rec a fully charged battery will run the bike for quite a while.

[g1b50n]

If you still have the battery out and not connected measure it's voltage for a day or two.. if the battery has a problem it'll drop quite low usually quickly.

Strange as the battery was fully charged, then dropped to dead very quickly.. were your lights on?

Even without a reg/rec a fully charged battery will run the bike for quite a while.

Alright mate, i took my new battery off my optimate charger today and the voltage of the battery was 13.2v standing. I put the battery back onto my bike and it started up straight away then ran for a minute until it died. the battery reading whilst running just fell from 13.2v downwards until it cut out.

The voltage on the battery then read 12.8-12.9v and the bike did not start after that. Ive used a multimeter to check the alternator plugs and have got the following readings......

Using that guide that was given to me kindly by Drunkn Munky ive got these results

3 Pin plug (Alternator Side) IIRC the resistance should be between 0.1 and 1 ohmns. No higher lol
Pins A-B = 0.4ohmns
Pins B-C = 0.4ohmns
Pins C-A = 0.4ohmns

So none of the coils are broken lol

Then each yellow wire to Earth
A to Earth = No Connection
B to Earth = No Connection
C to Earth = No Connection

So none of the coils are earthing out which is a good sign.
I have checked all connections for defects and everything seems fine,even done continueity tests to check for breaks in the wires and all seems fine. Does this point to the rectifier??The rectifier does look tired. i have ordered a new one anyways to be on safe side

I know the battery is new but even new shit can fail at times. Im going to check the voltage of the battery over the next few days like you said to see if it drops.

[g1b50n]

How long should it actually run for just on the battery alone?? Does anyone know please lol

[magg]

You said "ran for a minute until it dies", this is not what a fully charged battery would do. Either the battery is not fully charged, a dud or there is an electrical load in the bike that is discharging it at an alarming rate. Try disconnecting the rect/reg, if faulty it could be a short circuit battery load.

Also with rect/reg disconnected use a multimeter on ohms to measure between the terminals on the rect/reg where the red/white wire and green wires normally connect. +ve probe on red/white wire terminal and -ve probe on green wire terminal. Should measure infinity.

[g1b50n]

You said "ran for a minute until it dies", this is not what a fully charged battery would do. Either the battery is not fully charged, a dud or there is an electrical load in the bike that is discharging it at an alarming rate. Try disconnecting the rect/reg, if faulty it could be a short circuit battery load.

Also with rect/reg disconnected use a multimeter on ohms to measure between the terminals on the rect/reg where the red/white wire and green wires normally connect. +ve probe on red/white wire terminal and -ve probe on green wire terminal. Should measure infinity.

Yeh it ran for around a minute lol, that was fully charged aswell. I charged it again yesterday, the voltage after i charged it was 13.25v, i have just checked now this morning and its 13.10v. I think im gunna take the battery to work and load test it. If its fucked then im on the phone to the supplier lol. I will also check for resistance on the green and red like you said.

[magg]

A fully charged battery is 12.8 volts. You can have a higher voltage on a battery fresh of the charger depending on the settings of the charger. With time or a small load the voltage should stabilize around 12.8.

As the rect/reg is permanently connected across the battery, a low resistance fault between the red/white and green wire terminals it will discharge the battery.

Try reconnecting the charged battery with the rect/reg disconnected and monitor the battery voltage with your multimeter. The voltage should remain around 12.8 volts. Turn on the headlights, voltage might drop slightly initially but remain above 12 volts for at least an hour. If not the battery is a dud. Turn off the headlights.

Now reconnect the rect/reg, the battery voltage should not change if it does there is a problem with the rect/reg.