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DonnyDon

Joined:

Feb 09

Posts: 117

DonnyDon says:

Volt Metre.....battery testing

To check the battery recharge system, am i right to think that the volt metre needs to be connected to the negative wire which attach's to the battery? after disconnection from battery?  This is a 82 xl250r single that has 3 lives comming out of the stator, 1= headlight. 1= spark, 1= recharge of battery then battery works only other electrics, horn/indicators ect.

New battery on 50 miles ago, now flat!

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  • Posted 4 years ago (05 September 2010 12:24)

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bazablue

Joined:

Mar 10

Posts: 665

bazablue says:

meter

disconnect all then test battery.......it may give 12volts but its an ammeter you need....so get a multi tester...if any doubt sling battery its not worth it.....should be under warranty anyway ,take it back....test first or they will say its your gennie.....should return about 14volts on a 12v system.......

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smoto5

Joined:

Mar 09

Posts: 4586

smoto5 says:

You need to keep

your battery connected when you test your charging system, disconnecting won't do the electrics a lot of good if batteries not in the circuit, may not be too good for multimeter either especially if system is overcharging battery. By all means test battery condition with it disconnected and engine off. Hope that's helpful :smile

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gjkt

Joined:

Jul 09

Posts: 438

gjkt says:

Wiring diagram

if it helps.

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stingy5

Joined:

Apr 10

Posts: 900

stingy5 says:

new battery

if its flat, did you charge it before fitting?

 

some batteries, especially aftermarket, need full charge before fitting.

 

why did ur last battery go flat...have you got at least 13.7 charge to it...engine running?

 

check terminals, earths....do your lights get brighter when revving?

 

are your indicators slow, with lights on at tickover.

 

charge new batteries if aftermarket, before fitting, for 24 hours on an optimiser. if still probs, you got alternator probs...but more likely bad earth / live connection on battery

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jaffa90

Joined:

Mar 09

Posts: 8590

jaffa90 says:

battery

I would charge the battery replace it and check voltage after a hour,it should read approx 6.3v dc.Then start the bike and put your flasher on/side lights and whatever runs off the battery but rev the bike at 4/5000rpm and note the voltage reading again,i don`t know the reading from a single phase please tell me.You might as well check for battery drainage with everything switched off and a 28year old bike.Put the meter on amps,take the neg -- lead off the battery and put the pos+ probe (meter) on that,put the neg-- probe (meter) on the neg-- battery terminal.Any reading will show a drainage which you will have to investigate.Warning when using the ammeter range do not switch on.Let us know what you`ve got.

[This Reply has been modified by the Author]

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DonnyDon

Joined:

Feb 09

Posts: 117

DonnyDon says:

erm....sorry!

Forgot to mention its a Jap import and a 12v system, but the wiring diagrams are the same apart from switches ect.

Bike did 50/60miles on new battery, fully charged, horn indicators, brake light worked fine gradualy faded to nothing...  battery now showing 5.6v only.

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jaffa90

Joined:

Mar 09

Posts: 8590

jaffa90 says:

6/12 V

That`s ok just double my stated volts.What you got. 

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DonnyDon

Joined:

Feb 09

Posts: 117

DonnyDon says:

battery

Battery now  showing fully charged showing 12.3 volts.

im going to leave it stud 5 days and take another reading, then place on bike ( bike not to be started ) then check another 5 days later.

this may suggest a short or perhaps not a short?

but maybe only shorting when ignition is on - erm!!!

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NORTHERNHELLBOY

Joined:

Feb 10

Posts: 864

?????

WHAT SORT OF BIKE IS IT?

only ask, as my old Honda had a dud rectifer that was frying the battery (smelt of rotten eggs)..common fault on old honda's

PLUS: may sound daft, but wor lass kept having starting problems..couldn't figure out why..did all the checks..the fault was how she locked the bike..IN PARK with the rear light on. EASY MISTAKE TO MAKE?

all good advise so far, but you deffo need a multimeter

[This Reply has been modified by the Author]

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jaffa90

Joined:

Mar 09

Posts: 8590

jaffa90 says:

battery

A fully charged sealed battery should read no less than 12.8volts,after leaving it for a few weeks should not drop below 12.4volts and should not drop below 10volts when starting. 

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