2005 Toyota 4Runner parasitic drain on battery?

  • 6 CYL
  • 4WD
  • 90,000 MILES
Thanks for helping with this!

After having several mornings of no starts, I replaced my battery... Only to have it go dead 2 days later. This only happens after letting her sit overnight or longer.

Here's what's been done so far:

Took the car to Kragen and had them "test" the battery, alternator and starter. All came up fine. Load tested the battery - that came up fine also. I changed the batt anyway after the car wouldn't start (started with a charger on it)

I measured the (new) battery when I parked last nite at 10pm: 12.67. This morning I measured the battery at 10am: 12.43. Only about a 10 F degree temp drop. That's a big draw right?

I and gave the old battery (that I thought was faulty so I changed it out) a full charge. I let it settle and it tested at:12.75 It has been sitting in my garage and 4 days later it tests: 12.69 Not much of a draw.

I believe this indicates a key-off drain so I disconnected the pos terminal after letting the car sit for over an hour and tested across the terminal and the cable for mA draw. (After determining that my cheap multitester had a blown fuse in it) and started pulling fuses.

The slightly less cheap multitester showed a draw (After I unplugged the dome relay) of 25 - 19 mA (keeps jumping around) until I take out the "short pin" fuse. Does anyone know what this is for?

After the short pin fuse is removed the draw goes down to.3mA

Thoughts? Can a starter that is going bad drain a battery?


Oh - totally stock, no after market anything.
Do you
have the same problem?
Saturday, November 6th, 2010 AT 2:50 AM

1 Reply

Hi afiregirl,

Which " short pin " fuse are you referring to?

The starter should not be the cause unless the solenoid is stuck or installed wrongly.

Was any repairs done prior to this occurring?
Was this
Sunday, November 7th, 2010 AT 9:36 AM

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