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1947WC 
Silver Level
Joined: 11 Dec 2015
Location: Wisconsin
Points: 214
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 Topic: One wire alternator
Posted: 20 Apr 2020 at 1:41pm |
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Is there any way to test a 1 wire alternator with a test light it's a positive ground.
Edited by 1947WC - 20 Apr 2020 at 2:11pm
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Jim.ME
Orange Level
Joined: 19 Nov 2016
Location: Maine
Points: 962
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Posted: 20 Apr 2020 at 3:36pm |
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I am guessing you are talking about checking alternator output. About the only thing I can see a test light will tell you is there is power at the alternator output stud, which it should have at all times on a one wire alternator. You need a voltmeter to see if the voltage changes when it is running. Positive or negative ground makes no difference in that. I have to ask this, Are you sure it is actually a positive ground alternator?
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Dakota Dave
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Joined: 12 Sep 2009
Location: ND
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Posted: 20 Apr 2020 at 5:57pm |
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Take it off and take in and have tested at the auto parts store. If your alternator has been hooked up POS ground your going to need a new one any way. The diodes are blown and it'll have no output. There are specitly shops that will make a POS ground alternator but they are very expensive. Negative ground became the world standard even before 12 volts became the standard voltage.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
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Posted: 20 Apr 2020 at 5:59pm |
Check with a volt meter, at battery. volts running, vs volts not running... 
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1947WC
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Location: Wisconsin
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Posted: 20 Apr 2020 at 9:01pm |
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Thanks Jim.ME
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1947WC
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Posted: 20 Apr 2020 at 9:08pm |
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Thanks Diy.Dave
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1947WC
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Location: Wisconsin
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Posted: 20 Apr 2020 at 9:13pm |
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Thanks Dakota.Dave
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Adam Stratton
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Location: SW MO
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Posted: 20 Apr 2020 at 9:24pm |
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Touch something metal to the bearing on the back of the alternator. If it magnetized, it is charging, if not it isnt
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1947WC
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Posted: 22 Apr 2020 at 1:09pm |
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I'll try that. Thanks Adam.
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jaybmiller
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Posted: 22 Apr 2020 at 1:16pm |
if, IF, the test light was an LED, then yes.....though everyone has a voltmeter. Just be sure the test leads are in properly(red2red,bl2blk) !!! 99.44% of all alternators are NEG ground BTW....
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