 parasitic drain by Alternator |
 May 22, 2014 - 9:50 AM
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 Enthusiast  Joined Aug 11, '08 From London Currently Offline Reputation: 7 (100%)  |
At first I thought my battery wasnt holding its charge. But with my new setup I found out with a multi meter that power is dropping as soon as the engine is off.
I did a parasitic drain test and discovered that by dis connecting my alternator, it stopped dropping!!! WTF???? Can somone pls explain as to how its possible my alternator is draining power when off? This post has been edited by yellowchinaman: May 22, 2014 - 12:07 PM |
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Replies
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Jun 11, 2014 - 11:07 AM
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 Enthusiast Joined Oct 29, '11 From Haltom City, Texas Currently Offline Reputation: 1 (100%) |
The diodes rectify alternating current into direct current.
You can test if your diodes are bad by measuring the voltage across the battery terminals while the engine is running. Normally there is 13+volts DC and <.10volts AC. If your multimeter is set to volts in AC and you get a significant reading you have a bad diode. It is called alternator ripple and you are performing an alternator ripple test. |
Posts in this topic
yellowchinaman parasitic drain by Alternator May 22, 2014 - 9:50 AM
Bitter How much is it pulling? May 22, 2014 - 12:14 PM
yellowchinaman QUOTE (Bitter @ May 22, 2014 - 1:14 ... May 22, 2014 - 2:49 PM The_enD Are you sure you posted the right video, because t... May 22, 2014 - 3:39 PM Special_Edy The battery voltage is dropping? The battery usual... May 22, 2014 - 4:44 PM Bitter It could be a bad diode in the alternator, but as ... May 22, 2014 - 8:10 PM Bitter Got it fixed? Jun 5, 2014 - 12:36 PM yellowchinaman No. Ive been putting it off. I think its what you ... Jun 10, 2014 - 1:53 PM Bitter Denso alternators are pretty easily rebuilt, you c... Jun 11, 2014 - 7:41 AM Bitter Yep, that's a good test. I don't know if t... Jun 11, 2014 - 9:54 PM yellowchinaman So does anyone know how I can fix the diode proble... Jun 13, 2014 - 5:35 PM Bitter https://www.google.com/search?q=toyota+alte...22... Jun 14, 2014 - 9:41 AM Special_Edy Yes do a real test. Parasitic drain test or altern... Jun 14, 2014 - 8:37 PM Bitter I'm wondering if he was just seeing his cap/li... Jun 14, 2014 - 8:59 PM Special_Edy QUOTE (Bitter @ Jun 14, 2014 - 9:59 ... Jun 15, 2014 - 2:10 PM yellowchinaman Its not the lithium and caps. I did the test befor... Jun 20, 2014 - 12:02 PM Bitter I located the battery he's using, it's onl... Aug 24, 2014 - 7:30 PM yellowchinaman I dont depend on the battery to start the car sinc... Aug 25, 2014 - 2:16 PM Bitter Caps have to draw off something don't they? Th... Aug 25, 2014 - 6:12 PM |
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