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Ask Ted Ritter Your Own Question
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4224
Experience:  Toyota Master Tech, ASE Certified
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Battery getting drained. Seems to be a parasitic draw of

Customer Question

Battery getting drained. Seems to be a parasitic draw of 70mA on the Alt-S fuse. Any ideas?
JA: Have you tested the battery with a voltmeter? And can you see if it's leaking or not?
Customer: battery seems fine and takes charge
JA: What is the model/year of your Toyota?
Customer: 2008 sienna limited
JA: Are you fixing your Sienna yourself? What have you tried so far?
Customer: yes, we are looking at it ourselves. so far only measured different ampage when pulling fuses and found that it went from 90mA to 20 when we pulled the Alt-S fuse
JA: Anything else you want the mechanic to know before I connect you?
Customer: not sure, so I guess no
Submitted: 14 days ago.
Category: Toyota
Expert:  Ted Ritter replied 14 days ago.

Thanks for posting

Does this draw also go down when disconnecting the alternator?

Customer: replied 14 days ago.
We only disconnected the smaller of the two cables going to the alternator. That did not make a difference.
Expert:  Ted Ritter replied 14 days ago.

Thanks, ***** ***** alternator fuse back in and all accessories and lights off including all interior lights disconnect the negative battery cable and connect the ammeter between the cable and the battery post, let me know how much draw you get this way.

Customer: replied 14 days ago.
Starts at 800mA and then drops and stays at 90mA after about 10 secs.
Expert:  Ted Ritter replied 14 days ago.

Any aftermarket installed equipment? Audio, video, alarm system?

Customer: replied 14 days ago.
No, the DVD player, stereo and Nav is all Toyota factory. I turned off the power for the sliding doors and backdoor so they are in manual mode to see if they are the culprit. No difference. Also turned the main door light switch to off.
Customer: replied 14 days ago.
What else is on the Alt-S fuse?
Expert:  Ted Ritter replied 14 days ago.

I'll have to look at a diagram to see what is on the same circuit.

Expert:  Ted Ritter replied 14 days ago.

Nothing else on the alt s fuse comes from the battery and goes directly to the alternator, green/red wire in the black connector.

Customer: replied 14 days ago.
Any other ideas?
Expert:  Ted Ritter replied 14 days ago.

Have you tried completely disconnecting the alternator from the circuit?

Customer: replied 11 days ago.
Have not had time to disconnect alternator completely. Car has been starting just fine since Sunday. Seems to be an intermittent issue.
Expert:  Ted Ritter replied 11 days ago.

Thanks for the update, I guess we're done for now.