Author Topic: Typical parasitic loads  (Read 2385 times)

JHZR2

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Typical parasitic loads
« on: October 09, 2008, 08:15:34 PM »
Hello,

My battery was down to 8.8V after 4 weeks of sitting.  This is abnormal, as my car has sat before without this sort of issue.

I have a keyless entry and stereo amp directly wired... so I checked them by themselves as well as the rest of the car.  What I got was this:

-keyless draw: 8.90 mA
-amp off: 6.55mA (including starter circuit which senses voltage in the speaker line and gives a starting pulse)
-Battery cable (OE car items only) only: 44.3mA

With everything connected together, I got 59.7, 60 and 63 mA at different times.

Now the odd part is that I went to the fuse box and found that only two circuits had draw:
-The one with the radio memory and a bunch of lights drew 39.82mA
-The anti theft and central locks drew 1.79mA
-The lighter and power antenna took 0.43

When I checked loads back in 2006 when I replaced my battery for age reasons, I found that the circuit with the radio memory took 37.1, but the difference could have been because of the battery voltages, I suppose????

I saw some guidance that suggested that modern cars should have no more than 50mA parasitics. Im at 60mA. Is this excessive? is 50 excessive? Given my draws, would it be smart for me to consider a deep cycle battery?

Your thoughts are appreciated.

Thanks,

JMH

szed03

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Typical parasitic loads
« Reply #1 on: October 18, 2008, 12:18:47 AM »
Wow, that's quite a bit of current draw.  Not sure if you've fixed the issue yet but if not, do you have a schematic of the circuit with the radio memory and lights?  I would look to see if there are any fuses after the main circuit fuse and start pulling those.