Help with rectifier diode test
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Thread: Help with rectifier diode test

  1. #1
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    Question Help with rectifier diode test

    hi. today i went for a ride and what i noticed was the bike horn sound was getting weaker and weaker. but i kept riding and after few kilometers RPM dropped and died. lucky i've got my multimeter with me and checked the battery. it was 11.9V. so i guessed it was a charging related thing. i pushed start the bike again and it worked. then i came back home using only the battery. i recharged my battery and fitted to the bike. after that i checked for charging with my multimeter and it was not charging at all. voltage wasn't increasing at all.

    then i checked the stator first. coil resistance was ok. coil voltage both at high rev and idle were ok.
    pulse coil resistance was ok too.
    then i came to the rectifier and did some diode test. below are the results

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    d1 to a1 = 0.5
    d1 to a2 = 0.5
    d1 to a3 = 0.5
    reverse reading = all three readings were "OL"

    d2 to a1 = OL
    d2 to a2 = OL
    d2 to a3 = OL
    reverse reading = all three readings were 0.5

    d1 to d2 = 1.1
    reverse = OL

    are those reading ok ? if so what would be the culprit ? please give some advice. thank you.
    Last edited by Bikeboom; 17th April 2017 at 09:05 AM.

  2. #2
    Senior Biker Lane's Avatar
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    All you stated was stator voltage was ok, What is the actual AC voltage across all three terminals from the stator? What is the voltage out of the red and black terminals of the rectifier(d1 and d2)?
    Bikeboom likes this.

  3. #3
    Senior Biker Lane's Avatar
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    I did an R6 recently where it would only play up once hot.
    Bikeboom likes this.

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  5. #4
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    Quote Originally Posted by Lane View Post
    All you stated was stator voltage was ok, What is the actual AC voltage across all three terminals from the stator? What is the voltage out of the red and black terminals of the rectifier(d1 and d2)?
    stator voltage at idle was 15V. at 5000rpm it jumped to 50V. voltage out of the d1 and d2 was the same as the battery voltage at that time ( 12.5V i think since the battery was not charging ). actually it was the rectifier itself. i changed the rectifier today to an OEM rectifier which was made in Thailand. it works fine. did a bit of riding and battery was fully charged ( 13V at rest ). hope it won't give any trouble
    Last edited by Bikeboom; 18th April 2017 at 10:51 PM.

  6. #5
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    so the conclusion is diode test only tells the condition of the rectifier up to some point. even if it passes the diode test it could still be a bad rectifier when it comes to charging. coz my rectifier passed the test. there were no burning marks around the rectifier or its clips. yet it's blown.

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