Yet another parasitic draw thread -
  • 1 Post By yjsaabman
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post #1 of 7 Old 09-20-2021, 08:40 PM Thread Starter
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Yet another parasitic draw thread

So I've been chasing a .3 amp draw in my 97 ZJ limited with a 5.2 v8 in it. I've pulled every fuse, tore apart the dash to unplug radio, climate control etc, unplugged BCM, removed the alternator, removed grounds in the engine bay but it's still there. The only aftermarket electrical part that I have is the Big 7 kit from jeepcables cause my old wires were corroded.

Am I just crazy and that's normal or am I missing something obvious? I've tried just about every trick I've found on the interwebs to no avail. I can see the draw if I measure between the negative and the cable, but also between the negative and engine block which is also confusing me. Thanks for any help in advance!

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post #2 of 7 Old 09-20-2021, 08:43 PM
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Mine was the rear flip glass switch.

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post #3 of 7 Old 09-20-2021, 11:58 PM
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Make sure your battery does not have an internal drain. Charge it with the ground cable off, check volts and let it sit overnight. If the volts drop get the battery load tested.

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post #4 of 7 Old 09-21-2021, 02:39 AM
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Have you tested your alternator?

1) When the engine is running, test for an AC voltage at the battery.

2) When the engine is not running, take the big cable off the back of the alternator, and check for a current / amp flow between big cable and alternator post.

If you get AC volts, or a current flow, it's a pound to a penny, you need a new alternator.
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post #5 of 7 Old 09-21-2021, 02:43 AM
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If your alternator is OK, then try turning your interior lights off at the main switch.
Whilst the interior lights may have dimmed enough for you to think they've gone off, they may still be drawing current.
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post #6 of 7 Old 09-21-2021, 02:49 AM
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If the previous ideas don't work, it may be something you'd be best off living with.

In my book, life's too short to fornicate with chasing rogue discharges.
I carry a jump start pack as insurance against a rogue discharge.
My car usually goes on a maintainer as soon as I park up.

Good luck with it whichever route you take.
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post #7 of 7 Old 09-21-2021, 04:00 AM
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A 300mA draw is enough to cause a jump start situation in a few days easily. Usually you want to see less than 30mA (.030A.) Rather than pulling fuses, check for a voltage drop across the fuses with them installed. Anything more than zero and that's the circuit you want to be checking. Draws can be a pain to diagnose and very time consuming. Good luck!

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