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Alternator ripple \ diode test (Read 307 times)

liteace

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Alternator ripple \ diode test
Mar 27^th, 2012 at 12:15pm

Hi All, Just having a play today, plugged Pico into me 26 year old work van that has original alternator, done an Alternator ripple diode test, it all looks good, I was quite surprised seeing as it's 26 years old. Can someone have a look at the saved wave for me, have a look at screen 1 to 12, they are cooling fan on and just at the beginning of 12 to 15 is fan switching off, on 1 to 12 is that just noise from the cooling fan motor, if i activate filtering it goes ?

Thanks

« Last Edit: Mar 27^th, 2012 at 1:57pm by liteace »

liteace_fan_on_off.psdata (6667 KB | )

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drdiesel1 Super Nerd Picogroup Offline Posts: 1,243 Nevada USA Nevada USA Gender:	Re: Alternator ripple \ diode test Reply #1 - Mar 27^th, 2012 at 10:44pm It's good that you noticed the coolant fan and attributed the noise to it. Whenever you have abnormal noise, always double check the ground too
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liteace Freshman Member Offline Posts: 27	Re: Alternator ripple \ diode test Reply #2 - Mar 27^th, 2012 at 11:38pm Thanks, that's exactly where it shuts off, its not a factory fitted fan its a used one off another make of vehicle, its been there a couple of years now and does its job quite well, the earth for it is direct to battery, would you say this was abnormal noise or just the norm for an electric fan ? Thanks
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drdiesel1

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Re: Alternator ripple \ diode test
Reply #3 - Mar 27^th, 2012 at 11:45pm

liteace wrote on Mar 27^th, 2012 at 11:38pm:

Thanks, that's exactly where it shuts off, its not a factory fitted fan its a used one off another make of vehicle, its been there a couple of years now and does its job quite well, the earth for it is direct to battery, would you say this was abnormal noise or just the norm for an electric fan ?

Thanks

I've never really measured noise relationship with fans, but it's very possible it's normal as long as the connections are good.
Having it grounded straight to the battery could be why it's so pronounced in your WF.

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liteace Freshman Member Offline Posts: 27	Re: Alternator ripple \ diode test Reply #4 - Mar 27^th, 2012 at 11:58pm Thanks again for the info, i'll check another one today thats got a fatory fitted fan and see what its like. Its 9am here, im off to work now Thanks
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