newbie with prob,s

[cracar]

Hi folks just joined this great forum as i,ve recently purchased a 93 fj with some running problem,s. looking for some help the problem is bike will not start and sounds like a bag of spanners when i turn it over if i disconect the alternator the bike runs fine tried a second hand alternator but same problem. any ideas would be appreciated

[Flying Scotsman]

Hi folks just joined this great forum as i,ve recently purchased a 93 fj with some running problem,s. looking for some help the problem is bike will not start and sounds like a bag of spanners when i turn it over if i disconect the alternator the bike runs fine tried a second hand alternator but same problem. any ideas would be appreciated

You said will not start and also bike runs fine.
Will it start or not.If it runs but discharges the battery stick a volt meter on the battery when its running and see if the volts are more than 12.5 v.Check volts before during and after she starts.Low voltage will turn the bike over but wont start it.

[cracar]

Hi thanks for your reply , bike will not start with alternator connected and while turning the bike over sounds terrible but when i disconnect alternator bike starts first press of the button and runs perfectly

[Arnie]

Are you physically removing the alternator, or just disconnecting the electrical leads? 
If you're removing the alt, then it might be a problem with the chain/gear drive to the alternator.  If its just dis-connecting the wires, I'm stumped.

Cheers,
Arnie

[irishluck]

now that is incredibly weird..... but i can see what arnie is saying if you actually are removing it and such....

[fj11.5]

Sorry to interupt . just a q for arnin, did u get my pm about the fairing

[cracar]

Are you physically removing the alternator, or just disconnecting the electrical leads? 
If you're removing the alt, then it might be a problem with the chain/gear drive to the alternator.  If its just dis-connecting the wires, I'm stumped.

Cheers,
Arnie

Hi arnie thanks for your reply i,m only disconnecting the leads.

[cracar]

Hi could a faulty regulator cause this to happen?

[andyb]

I'd say unlikely but it'd be easy to swap over to test.

If you're just disconnecting the leads and it's making strange noises... hrm.  I wonder if putting load on it is allowing it to put a load on the drive that goes to the alternator and that is where the noise comes from.

[cracar]

Hi andy i had the bike running earlier with the alternator disconnected and using a voltmeter got a reading of 19.6v at the disconnected alternator plug can,t get a reading at the battery terminals with the alternator connected to prove the regulator is fubar though.

[racerman_27410]

not unheard of for the regulator to go bad..... RPM randy has a nice replacement that will fit right in the alt. and so far has been rock solid charging my FJ.

still dont know where the noise could be coming from but there is no telling what the bad charging circuit could do.



KOokaloo!

[chapindad]

At 19.6v I would not hook it up again.  You can screw some things up.

[racerman_27410]

At 19.6v I would not hook it up again.  You can screw some things up.

nothing wrong with that number.... the alternator is capable of putting out much more voltage than that..... that's what the regulator is for... it makes sure the battery gets the correct voltage and shunts off the unnecessary volts as heat.

when my regulator went bad i saw as high as 27 volts on my voltmeter (as well as a melted ground terminal on my battery)

KOokaloo!