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I have a 2003 Honda Accord Couple V6 EX-L automatic with Navigation, now with 236K miles, whose battery is drained every morning.
1. Last year I had the alternator replaced.
2. I bought a new battery two days ago.
When I jump the car it works great and the battery retains charge from the alternator becuase I can restart the car multiple times afterwards. However, went I let it sit overnight, it is drained the next morning.
A. I used my multi-meter to verify (from the negative battery terminal) that there is a 3.75A current flow even AFTER the car is turned off and all light and other electrical consumers (radio/cabin ligts/trunk light) are off.
B. I tried pulling each fuse in the fuse boxes I could find (Cabin passenger side/main fuse box in the engine compartment/And there seem to be a smaller fuse box with one fuse box next to it) while watching the multi-meter amperage AND stay around 3.75A.
IS there another fuse box elsewhere?
There is a residual current flow of 3.75A after the car is turned off that is draining my battery. When I disconnect my negative terminal my car starts fine at reconnection.
The battery drain started last week.
The alternator was replaced last year.
Yes. I meant the cabin fuse box on the passenger side.
Here are two pictures that shows the "small fuse box" adjacent to the main fuse box in the engine compartment. The light blue "fuse" on the upper left outside edge of the main fuse box is what I thought was an additional fuse box. Also is the component marked 50 50 in that corner also a fuse?
The bottom pic shows that light blue "fuse" covered over.
1) Check your relays... one of them could be broken and "closed" or shorted even with the engine off.
2) Pull each fuse and check for continuity from each post to ground. If you get 0 ohms on BOTH posts, then that is the problem area.
3) Check the alternator, the rectifier bridge could be bad.
Last edited by rockhoundrob; Jan 9, 2019 at 09:23 AM.
You already know this, but in the meantime, until the problem is fixed, you might want to install a battery disconnect, to protect your battery from damage. I have a parasitic drain, 1 amp x 90 minutes, on my 2005 Accord Hybrid that I have not resolved yet. I've pretty much adapted to disconnecting the battery when I turn off the car for a while. Your 3.75 amps is much higher.
2003 Honda Accord Couple V6 EX-L Battery Vampire Circuit
