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Old 05-27-2013, 01:40 AM   #136
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Cut off switch for car battery blowing fuses


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Well guys... we got all sorts of readings here.... all still pretty small.

Super.... French is really smart... I think he just saw your post wrong... but point 028 (.028) is 28 ma ... not 280ma.

However, without fully analysing the meter, we did see 310ma on one reading and 150 on another. Both of those are much a multiple of 25-30ma... but still seemingly not big enough to knock your battery down overnight.

Let's try and get the draw reading figured out tomorrow.

Peter

(Incidentally, I'm pretty sure on your MM that the 10A dial setting with its appropriate plug is designating max reading and not a multiple of the reading. That conclusion, as is normal operation of mm, means .o28 is 28ma, not 280ma.
I think French will agree, or correct me, if he rereads your post.)
Ok I get your point but the biggest question is one of the DVM is reading at correct scale.

I have talk to one of my freinds whom they work on alot of cars and he say 10 to 25 ma range is normal for most case unless someone add a aftermarket securety device or aftermarket radio that useally upped the ante of the ma useage.

To OP did your car came with oringal radio or aftermarket or any other modifactions it been done like aftermarket remote / secturey device ?

I will get a hold of my freind later once I get more information from ya.

Merci,
Marc

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Old 05-27-2013, 02:32 AM   #137
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Cut off switch for car battery blowing fuses


Nothing that I know of is aftermarket.. It wasn't mentioned when we bought it.
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Old 05-27-2013, 04:55 AM   #138
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Cut off switch for car battery blowing fuses


Is the battery currently charged enough to start and run the vehicle? If the battery is already discharged then your parasitic draw readings may not be accurate. Up to 50 ma would be considered normal and not enough to discharge the battery overnight.

Have you verified that the car will start and run normally each day as long as you disconnect the battery when you are finished driving it? Maybe you have charging issues, if the alternator is not charging, the battery will discharge while driving.

Make sure that the alternator is charging the battery by touching both post of the battery with the multimeter set to DC volts. With the engine running you should see about 13.5 volts.

Parasitic draw can be intermittent, my last few encounters have traced the problem to a relay that did not consistently open when the key is turned off. While it can be as simple as a glove box light or trunk light that does not turn off, it can also be difficult to diagnose something like a relay. Finding the circuit with the draw is fairly simple, finding the actual problem is sometimes a lot tougher.

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Old 05-27-2013, 06:54 AM   #139
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Cut off switch for car battery blowing fuses


The key to successful troubleshooting is to eliminate the guesses, obviously. I have read all of the pages and it really does seem that high current is being drawn when you are not watching the meter. This suggestion won’t fix your problem but it will confirm or eliminate an important unknown. I’m not current on handheld meter features because I haven’t bought one in years but some of my bench meters have a peak reading function that stores the figure in memory. If you could borrow, rent, steal, such a meter, that’s what I would do next. You might even be able to find a good deal on an older meter with the peak hold feature on E-bay.

Another alternative would be to use the meter you already have and play with the fuse values on the 10 amp scale. Say, start out with a 100 or 200ma fuse and see if it ever blows overnight. Adjust the fuse accordingly if you want to find the approximant current draw but this step really isn’t necessary at this point.

EDIT....I just looked at my Fluke 77 which is a very old hand held meter and it has the peak reading hold feature which also works on the amp scale....duh!

Another EDIT....slow thinker here. I don't know where you park your car, garage....driveway....but the meter I just mentioned also BEEPS when it records a higher reading and that could definitely help you track down your problem. Baby monitor maybe, if the meter is not within hearing range?

Last edited by zappa; 05-27-2013 at 07:48 AM.
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Old 05-27-2013, 08:59 AM   #140
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Ok today I went out to the shop.... Broke out my trusty Fluke 87V ... Did some testing .. Got similar result as super....


Used the test light like I said worked t
Like a charm ..the KISS theory ...lol slight low dim pulse with nothing on ... Bright when turned something on....



But I could not get past that I could not get good amp readings like I know should be there mA or amps..... Hmmm

Ok like DUH .... Both internal fuses were blown...lol I do not use this for much past testing and setting Hz on generators .... I have an auto range smaller Fluke for the every day tasks.. V, ohms...


So check the fuses in the meter....


But the Test light is the simple ole school way ....LMAO .... I will report back after I buy the 25$ worth of fuses !!!!

Oh an 2003 chev truck was the test subject
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Old 05-27-2013, 11:45 AM   #141
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Cut off switch for car battery blowing fuses


I'm not going to be able to mess with it today. Without delving into a ton of details, my grandma went to the ER was kept in the hospital, I've had no sleep and can barely think straight.

Charging system puts out 14.5 volts, 14.56 volts if I remember correctly. Yes the battery is fine and car will start if I only plug the battery up when I'm ready to start it. My meter only has one fuse but I'm not sure if it's blown or not. It's not discolored or anything, but I don't see a wire or anything connecting the two ends (it's the glass tube type). I checked that after someone mentioned the fuse might be blown.
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Old 05-28-2013, 08:48 AM   #142
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Cut off switch for car battery blowing fuses


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I'm not going to be able to mess with it today. Without delving into a ton of details, my grandma went to the ER was kept in the hospital, I've had no sleep and can barely think straight.

Charging system puts out 14.5 volts, 14.56 volts if I remember correctly. Yes the battery is fine and car will start if I only plug the battery up when I'm ready to start it. My meter only has one fuse but I'm not sure if it's blown or not. It's not discolored or anything, but I don't see a wire or anything connecting the two ends (it's the glass tube type). I checked that after someone mentioned the fuse might be blown.
Back to your original thought. Visit a marine store and buy and install a battery disconnect switch. Pretty much all boats have one and they can handle the juice. Might have to run some large wires depending on where you want the switch ...

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