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Registered
Join Date: Oct 2001
Posts: 497
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How do you test the diodes of your alternator
or any diodes for that matter ?
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04-27-2003, 11:09 PM
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Registered
Join Date: Nov 2001
Location: Guildford, UK
Posts: 278
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Use a multimeter and set it to the resistance measurement setting.
You should get a reading one way and if you turn the leads around, you won't get any reading. i.e. it only allows current to flow one way. Cheers Jakes
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04-28-2003, 12:59 AM
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Senior Member
Join Date: Apr 2001
Location: Finland
Posts: 1,214
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This won't give accurate information, i.e. does not work always.
In my case all the diodes showed up good when measured with multimeter, so I took the alternator to the shop because I did not find anything wrong with it. Well, when they hooked it up to the test bench and tested it with enough current, the machine showed that 2 of the diodes were faulty.
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04-28-2003, 01:49 AM
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Join Date: Nov 2001
Location: Guildford, UK
Posts: 278
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Cool, I did'nt realise that. But I do remember that on the more expensive multimeters, some of them had specific diode and transistor test ports. Nice to keep in mind though.
Thanks Jakes
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If you want to run with the big dogs, you can't pee like a puppy!!! 92 Rover Metro 1.1 (54 manly horsepower) - Dont knock it it does 60 mpg!!! 81sc / 3.2 litre transplant (Broken BIG Time ) SCWDP deserter - HP junkie wannabe |
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04-28-2003, 01:57 AM
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Heck, I’m only 5 not 71!
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The diode is like a check valve for electricity. It will only allow current to flow in one direction. The diode has two terminals the anode and the cathode. The symbol looks like this.
 Current will flow through the diode when a Positive battery voltage is applied to the Anode and the Negative battery voltage is applied to the Cathode. The diode will block current flow when a Negative battery voltage is applied to the Anode and a Positive battery voltage is applied to the Cathode. The band or stripe line on one side of the diode indicates the Cathode side of the diode.
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04-28-2003, 08:08 AM
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