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alternator / generator / rectifier problems

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legge248
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alternator / generator / rectifier problems

Post by legge248 on Mon 22 Dec 2014, 6:41 pm

hi all!!! im having a problem with my alternator on my 1999 cb500s, out of the three yellow wires two are getting warm when connected to the rectifier, does this point to a short from alternator to rectifier or is it more likely a stator fault , the only reason i ask is i dont want to be breaking gaskets if it is the rectifier , thanks in advance aaron
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Stooby2
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Re: alternator / generator / rectifier problems

Post by Stooby2 on Mon 22 Dec 2014, 7:01 pm

Can you give a bit more info please. Ignition on or off, engine running or not? Is there any charging still? When you say warm, too hot to touch or just warm?

Cheers.
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legge248
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Re: alternator / generator / rectifier problems

Post by legge248 on Mon 22 Dec 2014, 7:17 pm

engine running, no charging (thats how i found the problem) and they seem to get hotter as the engine is running i turn off to avoid melting the insulation,  it seems like its only heating up when connected to the rectifier but i might be mistaken as i cant remember if i checked when unplugged lol
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teamster1975
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Re: alternator / generator / rectifier problems

Post by teamster1975 on Mon 22 Dec 2014, 8:14 pm

Here's a good read for starters, keep us posted!

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Re: alternator / generator / rectifier problems

Post by Guest on Mon 22 Dec 2014, 8:34 pm

Top of my head impression is that only two out of three coils are supplying all the current, hence hotter wiring due to increased voltage drop as a result of higher current... guessing
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Stooby2
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Re: alternator / generator / rectifier problems

Post by Stooby2 on Tue 23 Dec 2014, 7:14 pm

My guess is your rectifier is screwed and leaking to earth somewhere.
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legge248
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Re: alternator / generator / rectifier problems

Post by legge248 on Tue 23 Dec 2014, 8:20 pm

I have replaced the rectifier and that has solved the problem , thanks for the help guys!!
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eternally_troubled
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Re: alternator / generator / rectifier problems

Post by eternally_troubled on Wed 24 Dec 2014, 2:29 pm

Glad to hear you fixed it. It is usually the rectifier/regulator that is broken....

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