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Re: Garage Sale Alternator - Part 2 of 2 Cap'n 

By: Zimbler0 in POPE 5 | Recommend this post (1)
Sat, 22 Sep 18 1:45 AM | 51 view(s)
Boardmark this board | Pope 5 		Msg. 08277 of 62138
(This msg. is a reply to 08267 by Decomposed)
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A few new words for you, De.

"Open" With the multmeter set for ohms (or diodes) and the probes
held apart, that is an 'open' circuit. The 'analog' meter
(with the moving needle) will have the needle all the way to the left.
The 'digital' (with a numerical readout) should have 'OL' or something
to that effect.

"Short" with the two probes held together, the analog meter
should go all the way to the right. The digital meter should
say one ohm - or zero ohms.

With a diode, on the analog meter, depending on the scale, one should
see an open circuit measuring one way, and a relatively low
resistance reading the other way. (And by other way, I mean swapping
which end of the diode the probes are held against.)

With a good digital meter, on the Diode scale, one should read
open circuit one way, and around five hundred ohms the
other way.

Also, it is necessary to remove the diode from the circuit before
trying to read its resistances. Otherwise you could easily read
low resistance both ways . . giving you the resistance of the
wires in the alternator coils rather than the resistances of
the diode.

Oh yes, assuming the digital meter is any good, and it 'auto-ranges',
if one sets it to resistance (ohms) and holds both probes, it
should read '5M' or 6M' . . as in five or six megohms. The
resistance through you and your skin from probe to probe.

Good Luck.
Zim.




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Mad Poet Strikes Again.

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The above is a reply to the following message:
Re: Garage Sale Alternator - Part 2 of 2 Cap'n
By: Decomposed in POPE 5
Fri, 21 Sep 18 9:04 PM 		Msg. 08267 of 62138

micro:

Re: “There are LOTS of them that show the insides of altrnators and how to fix most common problems. Including the brushes...”

I'm watching one of the videos now and trying to follow along:

http://www.youtube.com/watch?v=oUhgyqm0wro

Unfortunately, one of the first things it says, at the 1'02" mark, is to put my multimeter into "diode" mode:

Uploaded Image

Nuts! What the #*^%! is that? My little voltmeter, cheap piece of 25-year-old junk that it undoubtedly is, doesn't have one.

Uploaded Image

I'm a packrat, though, and being a packrat does have its advantages. I hunted around and not only found another multimeter (bought at a garage sale for $2 not so long ago), it's better than the one I've been using. And it DOES have the setting I need.

So the alternator testing goes on.

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