My 2005 Honda Odyssey battery is draining. I have replaced the battery with a brand new battery. I have taken it to have the alternator and starter tested everything is good. But my battery is draining and won't start without a jump start
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The normal quiescent current from a battery (engine off) is in the range of 50 - 80mA (milliAmps).
If the quiescent current flow from your battery is >80mA then there's what is known as a parasitic drain on the battery i.e. extra current flowing that shouldn't be there and it is draining the battery
With the engine off, disconnect and remove the -ve battery cable from the -ve battery post on the battery and connect the DMM (Ammeter function) in series connection between the -ve battery cable and the -ve battery post on the battery and check what the quiescent current is, i.e. -ve battery post → Ammeter → -ve battery cable.
If it is >80mA you need to remove all the fuses, one by one and check what the quiescent current is with a fuse removed. It may be quicker for two people to do this i.e. one to remove the fuses, one by one and one to watch the meter to observe the current measurement. Perhaps start with the passenger compartment fuse boxes as these usually haves fuses that are lower rated and more specific to a feature rather then the engine bay fuse box where higher rated fuses are located and some of which supply more than one lower rated fuse.
If it is still >80mA, replace the fuse and remove the next one etc, (so as to not confuse which fuse belongs where), until you see that the quiescent current falls back down to the normal value. Once it does, check what circuit the fuse that has been removed supplies power to i.e. fuse number description in fuse box lid or the owner manual.
Once you know what circuit is causing the excess quiescent current to flow, when it shouldn't be, you're halfway to finding out what's wrong.
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1 Comment
@paulblake21913 is it draining overnight when it's parked or is it draining while you drive? Give us more details about that. I am thinking that this my be a parasitic drain :-) but that depends on the details we need to hear from you.
by oldturkey03