 Was looking for parasitic loss…, Tested today |
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| jim_hoyland |
 May 12 2025, 08:24 PM
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Get that VIN ?  Group: Members Posts: 9,962 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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Bob and I tested for a parasitic drain today; about a week ago engine wouldn’t turn over Hadn’t left anything on.
Today’s test we got 3.28 micro amps . The meter was connected to the battery neg post and system ground. Seemed ok ? |
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| Dave_Darling |
May 13 2025, 07:21 PM
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914 Idiot Group: Members Posts: 15,301 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Did you just put the probes on the negative battery post and the engine ground? With the battery ground strap connected?
Doing this will give you a very low reading that is basically meaningless. You need to disconnect the battery ground, then put the ammeter in between the battery post and a chassis ground. The most convenient one being the negative battery terminal. Unless you're using a very fancy "amp clamp" type of meter, an ammeter will only measure the current that is passing through it. --DD |
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| jim_hoyland |
May 13 2025, 07:47 PM
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Get that VIN ? Group: Members Posts: 9,962 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(Dave_Darling @ May 13 2025, 06:21 PM)  Did you just put the probes on the negative battery post and the engine ground? With the battery ground strap connected? Doing this will give you a very low reading that is basically meaningless. You need to disconnect the battery ground, then put the ammeter in between the battery post and a chassis ground. The most convenient one being the negative battery terminal. Unless you're using a very fancy "amp clamp" type of meter, an ammeter will only measure the current that is passing through it. --DD OK; the battery ground was disconnected 1st, one probe was set on battery neg post, the other probe was attached to the battery’s ground cable. |
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| Root_Werks |
May 14 2025, 05:07 PM
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Village Idiot Group: Members Posts: 8,863 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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QUOTE(jim_hoyland @ May 13 2025, 06:47 PM) QUOTE(Dave_Darling @ May 13 2025, 06:21 PM) Did you just put the probes on the negative battery post and the engine ground? With the battery ground strap connected? Doing this will give you a very low reading that is basically meaningless. You need to disconnect the battery ground, then put the ammeter in between the battery post and a chassis ground. The most convenient one being the negative battery terminal. Unless you're using a very fancy "amp clamp" type of meter, an ammeter will only measure the current that is passing through it. --DD OK; the battery ground was disconnected 1st, one probe was set on battery neg post, the other probe was attached to the battery’s ground cable. Yup, that's correct. Make sure NOT to turn on headlights or other large draw items. You'll either pop the fuse in your multimeter or burn it. It should say what max amp it can read. Had a parasitic drain on an L-Jet 2.0 many years ago. Wound up being the double relay. Just had to unplug relays and remove fuses one at a time until the drain went away. |
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Posts in this topic
jim_hoyland Was looking for parasitic loss… May 12 2025, 08:24 PM
worn
Bob and I tested for a parasitic drain today; abo... May 12 2025, 08:40 PM dtmehall i think that a lot more background info would help... May 12 2025, 08:43 PM jim_hoyland Typo : CDR, meant car engine
The car normally get ... May 12 2025, 08:52 PM L-Jet914 How old is the battery? Was the battery fully char... May 12 2025, 10:41 PM
ctc911ctc
How old is the battery? Was the battery fully cha... May 13 2025, 06:47 AM jim_hoyland Optima 34R, at least 10 yr old, test was done on f... May 13 2025, 05:51 AM L-Jet914
Optima 34R, at least 10 yr old, test was done on ... May 13 2025, 07:32 PM Superhawk996 Just not enough info. Details matter. May 13 2025, 07:57 AM 76-914 Jim, This is what LJet914 was describing but with ... May 13 2025, 08:31 AM jim_hoyland Thanks Kent :)
The second uTube is very good; it ... May 13 2025, 08:56 AM davep Considering a 10 year old battery, I would guess t... May 13 2025, 09:21 AM mgp4591
Considering a 10 year old battery, I would guess ... May 23 2025, 12:43 AM JOEPROPER When tested correctly anything below 0.05 Amps is ... May 13 2025, 10:05 AM jim_hoyland Good tips( thank you :) May 13 2025, 10:53 AM jim_hoyland Got my battery tester today and made a their preli... May 14 2025, 05:31 PM ClayPerrine I made this for an Okteenerfest tech session. It ... May 15 2025, 11:20 AM ClayPerrine If you want the MS Word copy of the document, PM m... May 15 2025, 11:25 AM Root_Werks Any multimeter should be able to run this test and... May 15 2025, 01:11 PM ThinAir I was very excited to try RootWerks approach since... May 22 2025, 02:12 PM Superhawk996
So... since disconnecting things never made a d... May 22 2025, 07:54 PM Root_Werks Oh boy, well, there's the starter and alternat... May 22 2025, 03:19 PM ThinAir
Oh boy, well, there's the starter and alterna... May 27 2025, 04:27 PM |
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