 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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| L-Jet914 |
May 12 2025, 10:41 PM
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Member Group: Members Posts: 372 Joined: 24-October 12 From: Davis, CA Member No.: 15,080 Region Association: Northern California |
How old is the battery? Was the battery fully charged when performing your parasitic draw test? A discharged battery will cause inaccurate readings. When you mean microamps, do you mean milliamps? 3.2mA is very low and not enough to kill a battery. Where as 3.2microamps is 0.0032mA (milliamps). On today's vehicles 50mA or less is nominal. Anything higher and the battery will discharge in about a week or less. I've always tested parasitic draw by connecting the positive lead to the positive battery post and then the negative lead to the positive battery cable, and then remove the positive battery cable. Grant it you can do it on the negative side with the negative lead on the negative battery terminal and the positive lead on the negative battery cable.
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| ctc911ctc |
May 13 2025, 06:47 AM
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#3
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Senior Member Group: Members Posts: 1,292 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
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QUOTE(L-Jet914 @ May 12 2025, 11:41 PM)  How old is the battery? Was the battery fully charged when performing your parasitic draw test? A discharged battery will cause inaccurate readings. When you mean microamps, do you mean milliamps? 3.2mA is very low and not enough to kill a battery. Where as 3.2microamps is 0.0032mA (milliamps). On today's vehicles 50mA or less is nominal. Anything higher and the battery will discharge in about a week or less. I've always tested parasitic draw by connecting the positive lead to the positive battery post and then the negative lead to the positive battery cable, and then remove the positive battery cable. Grant it you can do it on the negative side with the negative lead on the negative battery terminal and the positive lead on the negative battery cable. (IMG:style_emoticons/default/agree.gif) |
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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 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 Dave_Darling Did you just put the probes on the negative batter... May 13 2025, 07:21 PM jim_hoyland
Did you just put the probes on the negative batte... May 13 2025, 07:47 PM Root_Werks
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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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