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 > Parasitic current draw on tow vehicle

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SHRED

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Posted: 08/01/21 12:34pm Link  |  Quote  |  Print  |  Notify Moderator

My 2002 Honda CRV seems to lose its battery charge if it sits for a couple of days.
The battery has tested good at both NAPA and at Autozone.

I tried testing for draw with my cheap VOM by undoing the ground and running it in series on the 10A meter circuit, but it registered zero which isn't accurate since it draws some power for the clock, etc... I tried turning on the headlights and an interior light, I touched the VOM lead, and nothing. Nothing lit up. Is my VOM bad? It does measure voltage accurately however.

This is frustrating. Looks like I will need to take it in.
Is the allowable amp draw about 0.3 amps?

thanks


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Posted: 08/01/21 12:56pm Link  |  Quote  |  Print  |  Notify Moderator

FYI Once you disconnect and reconnect the battery electrical resets may occur and you no longer have the drain perhaps until driving and turning off the car. That is just one reason why a clampon ammeter is so useful.

Sounds like you meter is not working.


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Bob


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Posted: 08/01/21 01:00pm Link  |  Quote  |  Print  |  Notify Moderator

I recently viewed several informative YouTube videos on finding parasitic draws on both trucks and cars. They showed step by step troubleshooting method. Maybe you can find a video for your make and model.

time2roll

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Posted: 08/01/21 01:10pm Link  |  Quote  |  Print  |  Notify Moderator

Check the 10a fuse in the meter.


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SHRED

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Posted: 08/01/21 01:19pm Link  |  Quote  |  Print  |  Notify Moderator

Any recommendations for a quality VOM? I'm tired of cheap junky ones.

SHRED

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Posted: 08/01/21 01:27pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Check the 10a fuse in the meter.


The VOM still reads voltage.
Would that still be possible with a blown fuse?

Gdetrailer

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Posted: 08/01/21 01:30pm Link  |  Quote  |  Print  |  Notify Moderator

SHRED wrote:

Any recommendations for a quality VOM? I'm tired of cheap junky ones.


It isn't your cheap junky meter.

It is how you are using it.

10A setting you must use the input marked 10A.

On 10A setting you will have a very low current resolution of .1A at a time which will not reveal very low current draws.

Your DVM should have a MA (Milliamp) setting (may look like 1000 (1000 is 1A), 100, 10) which has a higher resolution. That setting will use your normal DVM "Volt/resistance" input lead.

Choose the highest range on the MA setting then switch down..

Have to very careful when using the MA setting as it is to smoke the meter..

2oldman

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Posted: 08/01/21 01:31pm Link  |  Quote  |  Print  |  Notify Moderator

How old is the battery?

time2roll

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Posted: 08/01/21 01:49pm Link  |  Quote  |  Print  |  Notify Moderator

SHRED wrote:

time2roll wrote:

Check the 10a fuse in the meter.
The VOM still reads voltage.
Would that still be possible with a blown fuse?
Yes

SHRED

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Posted: 08/01/21 01:52pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

How old is the battery?


4 months old.

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