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2000 Honda Odyssey battery is discharging overnight
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danbektam0519
New User
Mar 22, 2011, 9:16 PM
Post #1 of 3
(5805 views)
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2000 Honda Odyssey battery is discharging overnight
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This is on a 2000 Honda Odyssey, v6 3.5. The battery and starter are about 3 years old. It has the original Alternator.
It looks like my battery is discharging overnight, and this just started. I went out Sunday morning to start it and it would do anything, not even a clicking from the starter. I pulled the battery and starter and had them tested at AutoZone and they tested fine. When I put all back together it started fine. Voltage across the battery is 12.8v and when it is running I get 14.5v. Everything tests OK. The next day, Monday evening, the car had not been driven, and when I opened the door the lights looked real dim. The van wouldn't start and I had to charge the battery. After charging, I connected the battery, and got nothing when I tried to start it. I tapped the starter with a hammer, and them it started. These are strange problems. This evening (tuesday) I did some more trouble shooting and feel like the battery is just border-line going bad, or maybe something is discharging it over night, which is why it wouldn't start sunday morning after being driven several times saturday.
Does anyone have any ideas? One specific question is this; I disconnected the Neg battery cable and the tested the voltage between the NEG post and the NEG cable that was disconnected. It read 12.8v. I thought in this circumstance that I should read no voltage. This tells me something may be shorted, UNLESS, this is normal for this vehicle. I was told by a mechanic that internal computer systems will sometimes power up when battery power is restored after being disconnected. Is this normal? Also, other than the radio, do other items draw power when the vehicle is off? If so, I wouldn't think it would be enough to discharge a battery, or maybe my 3 year-old battery is just failing.
Any help would be appreciated.
(This post was edited by danbektam0519 on Mar 22, 2011, 9:17 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 22, 2011, 11:09 PM
Post #2 of 3
(5801 views)
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Re: 2000 Honda Odyssey battery is discharging overnight
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You check for drain by milliamps and may not have one. A battery can kill itself and with it charged if tapping on starter worked that's a strong clue that it's NG or by chance connections just aren't good enough. These things can test as good and not be. Batteries HATE going dead and self destruct and can't take that too many times,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 23, 2011, 5:34 AM
Post #3 of 3
(5794 views)
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Re: 2000 Honda Odyssey battery is discharging overnight
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As Tom indicated, your first step is to have the battery tested. you can't go any further without a known good battery. If you need to test for a draw, here is how it is done. You never measure voltage, only amps.
You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
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